CN104374721B - Spliced beef rapid detection system and method - Google Patents

Abstract

The invention discloses a system and method for quickly detecting spliced beef. The system includes a controller and a detection mechanism, the detection mechanism includes a base, a detection platform is arranged on the base, a rectangular groove is arranged in the middle of the detection platform, liquid is stored in the rectangular groove, a sample tray is arranged on the liquid, and the front and rear ends of the sample tray are The first permanent magnet and the second permanent magnet are respectively provided, the bottom of the sample tray is provided with a positioning column, the bottom of the positioning column is provided with a positioning head, the front inner side of the rectangular groove is provided with a first electromagnet and a first proximity switch, and the rectangular groove The rear inner surface is provided with a second electromagnet, the bottom surface of the rectangular groove is provided with several positioning blocks, the first drive motor for driving the positioning block to rotate is provided below the positioning block, the positioning block is provided with a positioning hole, and the bottom of the positioning hole is provided with The third electromagnet and the second proximity switch, an optical transceiver is arranged above the sample tray, and a camera is arranged above the rectangular groove. The invention can quickly, simply and accurately detect whether the beef is spliced beef.

Description

A system and method for rapid detection of spliced beef

technical field

The invention relates to the technical field of food detection, in particular to a system and method for rapidly detecting spliced beef.

Background technique

Beef is delicious, nutritious, and tastes good, and it is a first-class ingredient. But because its production cost is higher, especially high-grade beef cut, the price is not cheap. The spliced beef is spliced from pieces of beef of different sizes, which not only tastes bad, but also causes contamination between beef pieces from different sources, causing food safety problems.

Chinese Patent Publication No. CN1603794, published on April 6, 2005, the name of the invention is a method and device for quickly detecting beef tenderness with near-infrared technology. The application discloses a method and device for quickly detecting beef tenderness with near-infrared technology. The device is composed of a near-infrared light source, a near-infrared detector, a diffuse reflection optical fiber device, a microprocessor, a display and recording device and a rotatable stage. Its shortcoming is that this detection device can not detect whether beef is splicing beef.

Contents of the invention

The purpose of the present invention is to overcome the technical problem that the current beef detection system cannot detect whether beef is spliced beef, and to provide a system and method for quickly detecting spliced beef, which can quickly, easily and accurately detect whether beef is spliced beef.

In order to solve the above problems, the present invention adopts the following technical solutions to achieve:

A system for quickly detecting spliced beef of the present invention includes a controller and a detection mechanism, the controller includes a central processing unit, a touch screen and a light source control module, the detection mechanism includes a base, and a detection platform is arranged on the base, The middle part of the detection table is provided with a rectangular groove, and liquid is stored in the rectangular groove, and a circular sample tray is arranged on the liquid, and the front end and the rear end of the sample tray are respectively provided with first permanent magnets and the second permanent magnet, the bottom of the sample tray is provided with a positioning column, the bottom of the positioning column is provided with a positioning head, the positioning head is made of ferromagnetic material, and the front inner surface of the rectangular groove is provided with a first The electromagnet and the first proximity switch, the rear inner surface of the rectangular groove is provided with a second electromagnet, the bottom surface of the rectangular groove is provided with several positioning blocks, and the positioning block is provided below the positioning block to drive the rotation of the positioning block. The first drive motor, the positioning block is provided with positioning holes that cooperate with the positioning head and limit the free rotation of the positioning head, the positioning holes on the several positioning blocks are arranged in a straight line from front to back, and the bottom of the positioning holes is provided with The third electromagnet and the second proximity switch, an optical transceiver is arranged above the sample tray, the optical transceiver includes an illumination light source and a light receiver, a camera is arranged above the rectangular groove, and the central processing unit is connected with The touch screen, the light source control module, the first electromagnet, the second electromagnet, the third electromagnet, the first proximity switch, the second proximity switch, the first drive motor, the light receiver and the camera are electrically connected, and the light source control module is also electrically connected It is electrically connected with the irradiation light source.

In this technical solution, the illumination light source is a halogen lamp or a laser emitter. During detection, place the beef sample to be tested on the sample tray so that the center of the beef sample is located at the center of the sample tray.

The central processing unit controls the first electromagnet to work, the first electromagnet generates suction, the first permanent magnet on the sample tray is affected by the first electromagnet suction, the sample tray moves to the front inner side of the rectangular groove, and at the same time the first permanent magnet Acting on the first electromagnet under the action of suction, the position of the positioning head is calibrated to ensure that the positioning head can be inserted into the positioning hole. The distance between the left and right inner walls of the rectangular groove is slightly larger than the diameter of the sample tray, so that the sample tray can only move forward and backward, ensuring that the positioning head moves above the straight line formed by the positioning holes, so that the positioning head can be inserted into the positioning hole. When the sample tray moves to the front inner side of the rectangular groove, the first proximity switch sends a trigger signal, and the central processing unit receives the trigger signal from the first proximity switch, controls the first electromagnet to stop working, and controls the distance to the front of the rectangular groove. The third electromagnet at the bottom of the nearest positioning hole on the inner surface works, and the third electromagnet generates suction, and the positioning head at the bottom of the sample tray is inserted into the positioning hole by the suction of the third electromagnet, and the second proximity switch in the positioning hole sends out trigger signal. The central processing unit receives the trigger signal and judges that the positioning of the sample tray is successful. At this time, the center point of the sample tray is located directly below the optical transceiver.

The user can select the location of the positioning hole where the sample tray needs to be inserted through the touch screen. The central processing unit controls the third electromagnet at the bottom of the positioning hole closest to the front inner side of the rectangular groove to stop working, the sample tray is floated by buoyancy, and the positioning head at the bottom of the sample tray leaves the positioning hole. The central processing unit controls the operation of the second electromagnet and the third electromagnet at the bottom of the positioning hole where the sample tray needs to be inserted. The second permanent magnet on the sample tray is subjected to the suction force of the second electromagnet. sports. When the sample tray moves above the positioning hole to be inserted, the positioning head under the sample tray is attracted by the third electromagnet, the positioning head at the bottom of the sample tray is inserted into the positioning hole, and the second proximity switch in the positioning hole sends out a trigger signal . The central processing unit receives the trigger signal and judges that the sample tray is successfully inserted into the positioning hole selected by the user. The sample tray moves back and forth in the liquid without friction loss, and precise positioning is achieved through positioning holes.

The camera collects the image information of the rectangular groove and sends it to the central processing unit. The central processing unit obtains the position information of the sample tray through image processing, and monitors when the sample tray moves back and forth. If the sample tray does not move to the position of the positioning hole that needs to be inserted Directly above, the central processing unit adjusts the position of the sample tray through the first electromagnet and the second electromagnet, so that the central processing unit can adjust the position of the sample tray more accurately.

The central processing unit controls the positioning block where the positioning hole where the sample tray is inserted to rotate for one revolution, and stops to detect spectral data every horizontal rotation of 30 degrees. When detecting spectral data, the intensity curve of the detection light emitted by the illumination source first rises from 0 to the maximum value in a straight line, and then decreases from the maximum value to 0 in a sinusoidal curve. The light receiver detects the received reflected light intensity and sends it to the central processing unit, and the central processing unit processes the detected data accordingly to determine whether the beef sample to be tested is spliced beef.

The principle of optical detection of spliced beef: the whole piece of beef has natural continuous lines, clear layers, uniform color, and similar water content, so it is close to the reflection absorption spectrum signal at the incident angle, which can be used as the basis for detection. Although the different pieces of spliced meat have been sorted, glued and surface treated, their internal meat texture is not continuous, there are overall faults, the color is quite different, and the water content is difficult to be consistent. Therefore, it can be determined by optical detection methods. For the splice beef.

In the present invention, the sample is irradiated with incident light with constantly changing light intensity. During the change process of increasing or decreasing intensity of incident light, the absorption of different groups to light of corresponding wavelengths is gradually increasing or decreasing. At this time, the group The absorption degree is in the process of unsaturated and saturated fading, and the reflected light contains more detection information, so that the obtained detection signal can more accurately characterize whether the beef is spliced.

Preferably, the positioning head is flat, the longitudinal section of the positioning head is an inverted isosceles trapezoid, the shape of the positioning hole matches the shape of the positioning head, and an inclined guide surface is provided on the top of the positioning hole. The positioning hole is arranged along the direction from front to back, and the guide surfaces on the left and right sides of the top of the positioning hole play a guiding role, facilitating the insertion of the positioning head into the positioning hole.

Preferably, the distance between the left and right inner side walls of the rectangular groove matches the diameter of the sample tray. The distance between the left and right inner walls of the rectangular groove is slightly larger than the diameter of the sample tray, so that the sample tray can only move forward and backward, ensuring that the positioning head moves above the straight line formed by the positioning holes, so that the positioning head can be inserted into the positioning hole.

Preferably, the light source control module includes a function memory and a power amplifier circuit, the input end of the function memory is electrically connected to the central processing unit, the output end of the function memory is electrically connected to the input end of the power amplifier circuit, and the power amplifier circuit The output end is electrically connected with the irradiation light source. The function memory stores the function information sent by the central processing unit, and controls the illumination light source to emit detection light with different intensities through the power amplifier circuit.

Preferably, the positioning hole on the bottom surface of the rectangular groove closest to the front inner side of the rectangular groove is located directly below the optical transceiver. The positioning hole closest to the front inner side of the rectangular groove is used for the initial positioning of the sample tray, and the distance between the frontmost positioning hole and the rearmost positioning hole is the radius of the sample tray.

A method for rapidly detecting spliced beef of the present invention comprises the following steps:

S1: Prepare a sliced beef sample, place the beef sample on the sample tray so that the center of the beef sample is located at the center of the sample tray;

S2: The central processing unit controls the sample tray to be inserted into the positioning hole designated by the user according to the instruction input by the user through the touch screen;

S3: The central processing unit controls the irradiation light source through the light source control module to emit detection light with a specific light intensity to irradiate the beef sample. The detection light intensity curve first rises from 0 to the maximum value in a straight line, and then decreases from the maximum value to 0 according to the sinusoidal curve. The optical receiver collects the reflection spectrum data Spec(t), and then the central processing unit controls the first driving motor under the positioning block where the positioning hole where the sample tray is inserted is located to work, and the first driving motor controls the positioning block to rotate 30 degrees, so that the sample tray rotates horizontally 30 degrees, the light receiver collects the spectral data of the irradiation point of the light source at this time, so that the sample tray is controlled to rotate 360 degrees horizontally, and stops to detect the spectral data every 30 degrees of horizontal rotation, so as to collect the spectra of 12 different positions on the beef sample data Spect(t);

S4: The central processing unit performs the same data processing on the collected 12 spectral data Spec(t), and calculates 12 signal-to-noise ratio characteristic values, and the data processing for each spectral data Spec(t) includes the following steps :

With input signal As an input matrix, the potential function V(x, t, α) cooperates with the input signal to form a stochastic resonance model:

Among them, V(x, t, α) is the potential function, x(t) is the motion trajectory function of Brownian particles, t is the motion time, is a periodic sinusoidal signal, N(t) is internal noise, A is signal amplitude, f is signal frequency, D is external noise intensity, ξ(t) is external noise, for the phase,

Calculate the first-order derivative, second-order derivative and third-order derivative of V(x, t, α) with respect to x(t), and make the equation equal to 0 to obtain the two-layer stochastic resonance model:

Set the noise intensity D=0, Spect(t)=0, N(t)=0, the calculated critical value of A is Substituting A _c into a layer of stochastic resonance model, and setting x ₀ (t) = 0, sn ₀ = 0, using the fourth-order Longe-Kutta algorithm to solve a layer of stochastic resonance model, we get:

$\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; [</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ]</span>\\ \mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}\end{array}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, the undetermined coefficient:

(k ₁ ) _n ＝a(αx _n-1 (t)) ² b(αx _n-1 (t)) ³ +sn _n-1 (4)

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Wherein, x _n (t) is the n-order derivative of x (t), sn _n is the value of the n-order derivative of S (t) at t=0, and a, b are constants set,

Calculate the value of x ₁ (t), x ₂ (t)…x _{n +1} (t), integrate x ₁ (t), x ₂ (t)…x n+1 (t) to get x(t ), and get x( _t ) in the double-layer _stochastic resonance system composed of one-layer stochastic resonance model and two-layer stochastic resonance model. The motion acceleration α1 and the noise D1 corresponding to t1, D1 is a value in D,

by formula $\mathrm{SNR}=\sqrt{2}{\left(\mathrm{\&Delta;\; U}\frac{{4a}^3/27b}{{\mathrm{D.}}_1}\right)}^2{e}^{-{\left(\mathrm{\&Delta;\; U}\right)}^2/{\mathrm{D.}}_1}$ , calculate the signal-to-noise ratio eigenvalue SNR _feature , where, ΔU=a ² /4b;

S5: Divide the calculated 12 SNR feature values into four groups, divide SNR _{feature 3} , SNR _{feature 6} , SNR _{feature 9} , and SNR _{feature 12} into the first group, and divide SNR _{feature 2} , SNR _{feature 4} , SNR feature _{Feature 7} and SNR _{feature 11} are divided into the second group, SNR _{feature 1} and SNR _{feature 5} are divided into the third group, SNR _{feature 8} and SNR _{feature 10} are divided into the fourth group, and the average signal-to-noise ratio of each group is calculated respectively value, get SNR _{average 1} , SNR _{average 2} , SNR _{average 3} , SNR _{average 4} ,

Calculate the error QE _j between each SNR eigenvalue and the SNR average value of the corresponding group, j=1,...,12;

Counting the number M ₁ of SNR eigenvalues satisfying QE _j ≤ 2%, counting the number M ₂ of SNR eigenvalues satisfying QE _j >2%;

S6: if Then the central processing unit judges that the beef sample is not spliced beef, if Then the central processing unit judges that the beef sample is spliced beef, otherwise jump to step S3, and retest the beef sample.

Preferably, said step S2 includes the following steps:

S21: the central processing unit controls the operation of the first electromagnet, the sample tray is moved to the front inner side of the rectangular groove by the suction force of the first electromagnet, and the first proximity switch sends a trigger signal;

S22: The central processing unit receives the trigger signal from the first proximity switch, controls the first electromagnet to stop working, controls the third electromagnet at the bottom of the positioning hole closest to the front inner side of the rectangular groove to work, and the third electromagnet generates suction , the positioning head at the bottom of the sample tray is inserted into the positioning hole by the suction force of the third electromagnet, and the second proximity switch in the positioning hole sends a trigger signal;

S23: The central processing unit receives the trigger signal sent by the second proximity switch, and judges that the positioning of the sample tray is successful. At this time, the center point of the sample tray is located directly below the optical transceiver;

S24: the central processing unit reads the instruction input by the user through the touch screen to determine the position of the positioning hole where the sample tray needs to be inserted;

S25: the central processing unit controls the third electromagnet at the bottom of the positioning hole closest to the front inner surface of the rectangular groove to stop working, the sample tray is lifted by buoyancy, and the positioning head at the bottom of the sample tray leaves the positioning hole;

S26: The central processing unit controls the operation of the second electromagnet and the third electromagnet at the bottom of the positioning hole where the sample tray needs to be inserted, the positioning head at the bottom of the sample tray is inserted into the positioning hole, and the second proximity switch in the positioning hole sends a trigger signal.

The essential effects of the invention are: (1) It can quickly, easily and accurately detect whether the beef is spliced beef. (2) The sample tray moves back and forth in the liquid without friction loss, and precise positioning is achieved through the positioning holes.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention;

Fig. 2 is a structural schematic diagram of a rectangular groove;

Fig. 3 is a schematic structural view of a rectangular groove and a sample tray;

Fig. 4 is a sectional view of Fig. 3;

Fig. 5 is the structural representation of positioning hole;

Fig. 6 is a circuit principle connection block diagram of the present invention;

Fig. 7 is a light intensity curve diagram of the detection light emitted by the irradiation light source during detection.

In the figure: 1. Central processing unit, 2. Touch screen, 3. Light source control module, 4. Base, 5. Detection platform, 6. Rectangular groove, 7. Sample tray, 8. First permanent magnet, 9. Second Permanent magnet, 10, positioning column, 11, positioning head, 12, the first electromagnet, 13, the second electromagnet, 14, positioning block, 15, the first drive motor, 16, positioning hole, 17, the third electromagnet , 18, the first proximity switch, 19, optical transceiver, 20, illumination light source, 21, optical receiver, 22, lifting mechanism, 23, guide surface, 24, function memory, 25, power amplifier circuit, 26, camera, 27 , transverse connecting rod, 28, longitudinal connecting rod, 29, screw mandrel, 30, support rod, 31, threaded sleeve, 32, sleeve pipe, 33, the second proximity switch.

detailed description

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: A kind of system of rapid detection splicing beef of this embodiment, as shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, comprises controller and detection mechanism, and controller comprises central processing unit 1, touch screen 2 and light source The control module 3, the detection mechanism includes a base 4, a detection platform 5 is arranged on the base 4, a rectangular groove 6 is arranged in the middle of the detection platform 5, liquid is stored in the rectangular groove 6, and a circular sample tray 7 is arranged on the liquid , the front end and the rear end of the sample tray 7 are respectively provided with a first permanent magnet and a second permanent magnet, the bottom of the sample tray 7 is provided with a positioning column 10, and the bottom of the positioning column 10 is provided with a positioning head 11, and the positioning head 11 is made of ferromagnetic material Into, the front inner surface of the rectangular groove 6 is provided with the first electromagnet 12 and the first proximity switch 18, the rear inner surface of the rectangular groove 6 is provided with the second electromagnet 13, and the bottom surface of the rectangular groove 6 is provided with seven Positioning block 14, the first drive motor 15 that drives positioning block 14 to rotate is provided with below positioning block 14, positioning hole 16 that cooperates with positioning head 11 and limits positioning head 11 to rotate freely is provided on positioning block 14, seven positioning blocks 14 The positioning holes 16 are arranged in a straight line from front to back. The bottom of the positioning holes 16 is provided with a third electromagnet 17 and a second proximity switch 33. An optical transceiver 19 is provided above the sample tray 7. The optical transceiver 19 includes an illumination light source 20 and a light source. The receiver 21 and the base 4 are also provided with a lifting mechanism 22 that drives the optical transceiver 19 to move up and down.

As shown in Figure 6, the light source control module 3 includes a function memory 24 and a power amplifier circuit 25, and a camera 26 is also arranged above the rectangular groove 6, and the camera 26 is connected to the lifting mechanism 22 through a connector, and the central processing unit 1 is respectively connected to the touch screen 2, First electromagnet 12, second electromagnet 13, third electromagnet 17, first proximity switch 18, second proximity switch 33, first drive motor 15, light receiver 21, lifting mechanism 22, camera 26, function memory 24 is electrically connected to the input end, the output end of the function memory 24 is electrically connected to the input end of the power amplifier circuit 25 , and the output end of the power amplifier circuit 25 is electrically connected to the illumination light source 20 .

Lifting mechanism 22 comprises transverse connecting rod 27, longitudinal connecting rod 28, screw mandrel 29, support rod 30 and the second driving motor that drives screw mandrel 29 to rotate, and screw mandrel 29 and support rod 30 are vertically arranged on the base 4, and horizontal link One end of the rod 27 is provided with a threaded sleeve 31 sleeved on the screw rod 29 and a sleeve 32 sleeved on the support rod 30, the other end of the transverse connecting rod 27 is connected with the top of the longitudinal connecting rod 28, and the optical transceiver The device 19 is arranged at the bottom end of the longitudinal connecting rod 28 , the irradiation direction of the illuminating light source 20 is vertically downward, and the second driving motor is electrically connected with the central processing unit 1 . The central processing unit 1 can adjust the up and down position of the optical transceiver 29 through the lifting mechanism 22 to meet the actual detection requirements.

The positioning head 11 is flat, and the longitudinal section of the positioning head 11 is an inverted isosceles trapezoid. The shape of the positioning hole 16 matches the shape of the positioning head 11. As shown in Figure 5, the left and right sides of the top of the positioning hole 16 are respectively provided with inclined The guide surface 23. The positioning hole 16 is arranged along the direction from front to back, and the guide surfaces 23 on the left and right sides of the top of the positioning hole 16 act as guides, facilitating the insertion of the positioning head 11 into the positioning hole 16 .

The distance between the left and right inner side walls of the rectangular groove 6 matches the diameter of the sample tray 7 . The distance between the left and right inner walls of the rectangular groove 6 is 2 cm larger than the diameter of the sample tray 7, so that the sample tray 7 can only move back and forth, ensuring that the positioning head 11 moves above the straight line formed by the positioning holes 16, which is convenient for the positioning head 11 to insert and locate hole 16.

The positioning hole 16 on the bottom surface of the rectangular groove 6 closest to the front inner side of the rectangular groove 6 is located directly below the optical transceiver 19 . The positioning hole 16 closest to the front inner side of the rectangular groove 6 is used for the initial positioning of the sample tray 7 , and the distance between the frontmost positioning hole 16 and the rearmost positioning hole 16 is the radius of the sample tray 7 .

The sample tray 7 includes a circular chassis and an annular side wall connected to the outer edge of the chassis. The first permanent magnet and the second permanent magnet are respectively embedded in the front and rear ends of the annular side wall. The bottom of the chassis is provided with a downwardly protruding The bump is in the shape of a spherical crown, and the positioning post 10 is arranged at the bottom of the bump. The bump is in the shape of a spherical crown, so that the sample tray 7 can float up and down smoothly in the liquid. The chassis is used to place the beef sample to be tested, and the annular side wall can prevent the liquid from splashing on the beef sample to be tested on the chassis.

The function memory 24 stores the function information sent by the central processing unit 1 , and controls the illuminating light source 20 to emit detection lights with different intensities through the power amplifier circuit 25 . The camera 26 collects the image information of the rectangular groove 6 and sends it to the central processing unit 1. The central processing unit 1 obtains the position information of the sample tray 7 through image processing, and monitors when the sample tray 7 moves back and forth. If the sample tray 7 does not move Right above the positioning hole 16 to be inserted, the central processing unit 1 adjusts the position of the sample tray 7 through the first electromagnet 12 and the second electromagnet 13, so that the central processing unit 1 can adjust the position of the sample tray 7 more accurately. The irradiation light source 20 is a halogen lamp.

During detection, the beef sample to be tested is placed on the sample tray 7 so that the center of the beef sample is located at the center of the sample tray 7 .

The central processing unit 1 controls the first electromagnet 12 to work, and the first electromagnet 12 generates a suction force. The first permanent magnet on the sample tray 7 is subjected to the suction force of the first electromagnet 12, and the sample tray 7 faces the front inner side of the rectangular groove 6. At the same time, the first permanent magnet is facing the first electromagnet 12 by the suction force, and the position of the positioning head 11 is calibrated to ensure that the positioning head 11 can be inserted into the positioning hole 16. The distance between the left and right inner walls of the rectangular groove 6 is slightly larger than the diameter of the sample tray 7, so that the sample tray 7 can only move back and forth, ensuring that the positioning head 11 moves above the straight line formed by the positioning holes 16, which facilitates the insertion and positioning of the positioning head 11 hole 16. When the sample tray 7 was in contact with the front inner side of the rectangular groove 6 (at this time, the positioning head 11 was located directly above the positioning hole 16 closest to the front inner side of the rectangular groove 6), the first proximity switch 18 sent a trigger signal, and the center The processing unit 1 receives the trigger signal sent by the first proximity switch 18, controls the first electromagnet 12 to stop working, and controls the third electromagnet 17 at the bottom of the positioning hole 16 closest to the front inner surface of the rectangular groove 6 to work, and the third electromagnet 17 to work. The iron 17 generates suction, and the positioning head 11 at the bottom of the sample tray 7 is inserted into the positioning hole 16 by the suction of the third electromagnet 17, and the second proximity switch 33 in the positioning hole 16 sends a trigger signal. The central processing unit 1 receives the trigger signal from the second proximity switch 33 and judges that the sample tray 7 is positioned successfully, and the center point of the sample tray 7 is located directly below the optical transceiver 19 at this time.

The user can select the location of the positioning hole 16 where the sample tray 7 needs to be inserted through the touch screen 2 . The central processing unit 1 controls the third electromagnet 17 at the bottom of the positioning hole 16 closest to the front inner surface of the rectangular groove 6 to stop working, the sample tray 7 is floated by buoyancy, and the positioning head 11 at the bottom of the sample tray 7 leaves the positioning hole 16. The central processing unit 1 controls the second electromagnet 13 and the third electromagnet 17 at the bottom of the positioning hole 16 that the sample tray 7 needs to be inserted to work. The second permanent magnet on the sample tray 7 is subjected to the suction force of the second electromagnet 13, and the sample tray 7 Move to the rear inner side of the rectangular groove 6. When the sample tray 7 moved to the top of the positioning hole 16 to be inserted, the positioning head 11 below the sample tray 7 was subjected to the suction force of the third electromagnet 13, and the positioning head 11 at the bottom of the sample tray 7 was inserted into the positioning hole 16, and the positioning hole 16 The second proximity switch 33 inside sends a trigger signal. The central processing unit 1 receives the trigger signal and judges that the sample tray 7 is successfully inserted into the positioning hole 16 selected by the user. The sample tray 7 moves back and forth in the liquid without friction loss, and precise positioning is realized through the positioning hole 16 .

The central processing unit 1 controls the positioning block 14 where the positioning hole 16 where the sample tray 7 is inserted is located to rotate once, and stops to detect spectral data every horizontal rotation of 30 degrees. When detecting spectral data, the intensity curve of the detection light emitted by the irradiation light source 20 first increases from 0 to the maximum value in a straight line, and then decreases from the maximum value to 0 in a sinusoidal curve, as shown in FIG. 7 . The light receiver 21 detects the received reflected light intensity curve and sends it to the central processing unit 1, and the central processing unit 1 processes the detected data accordingly to determine whether the beef sample to be tested is spliced beef.

The principle of optical detection of spliced beef: the whole piece of beef has natural continuous lines, clear layers, uniform color, and similar water content, so it is close to the reflection absorption spectrum signal at the incident angle, which can be used as the basis for detection. Although the different pieces of spliced meat have been sorted, glued and surface treated, their internal meat texture is not continuous, there are overall faults, the color is quite different, and the water content is difficult to be consistent. Therefore, it can be determined by optical detection methods. For the splice beef.

In the present invention, the sample is irradiated with incident light with constantly changing light intensity. During the change process of increasing or decreasing intensity of incident light, the absorption of different groups to light of corresponding wavelengths is gradually increasing or decreasing. At this time, the group The absorption degree is in the process of unsaturated and saturated fading, and the reflected light contains more detection information, so that the obtained detection signal can more accurately characterize whether the beef is spliced.

A method for quickly detecting spliced beef in this embodiment is applicable to the above-mentioned system for rapidly detecting spliced beef, including the following steps:

S1: Prepare a beef sample with a thickness of 7mm-8mm, place the beef sample on the sample tray so that the center of the beef sample is located at the center of the sample tray;

S2: The central processing unit controls the sample tray to be inserted into the positioning hole designated by the user according to the instruction input by the user through the touch screen;

S3: The central processing unit controls the irradiation light source through the light source control module to emit detection light with a specific light intensity to irradiate the beef sample. The detection light intensity curve first rises from 0 to the maximum value in a straight line, and then decreases from the maximum value to 0 according to the sinusoidal curve. The optical receiver collects the reflection spectrum data Spec(t), and then the central processing unit controls the first driving motor under the positioning block where the positioning hole where the sample tray is inserted is located to work, and the first driving motor controls the positioning block to rotate 30 degrees, so that the sample tray rotates horizontally 30 degrees, the light receiver collects the spectral data of the irradiation point of the light source at this time, so that the sample tray is controlled to rotate 360 degrees horizontally, and stops to detect the spectral data every 30 degrees of horizontal rotation, so as to collect the spectra of 12 different positions on the beef sample data Spect(t);

S4: The central processing unit performs the same data processing on the collected 12 spectral data Spec(t), and calculates 12 signal-to-noise ratio characteristic values, and the data processing for each spectral data Spec(t) includes the following steps :

With input signal As an input matrix,

Under adiabatic approximation conditions, assuming that the signal amplitude is extremely small (A<<1), when the bistable system does not have enough energy to drive, the Brownian motion particles are biased in one side of the potential well, and the signal period is shorter than that of some typical potential wells The relaxation time of the internal system is much longer. At this time, the appearance of periodic driving force makes the potential function tilt, which eventually leads to the transition of Brownian motion particles from one potential well to another. Therefore, the potential function V(x, t, α) cooperates with the input signal to form a stochastic resonance model:

Among them, V(x, t, α) is the potential function, x(t) is the motion trajectory function of Brownian particles, t is the motion time, is a periodic sinusoidal signal, N(t) is internal noise, A is signal amplitude, f is signal frequency, D is external noise intensity, ξ(t) is external noise, for the phase,

Calculate the first-order derivative, second-order derivative and third-order derivative of V(x, t, α) with respect to x(t), and make the equation equal to 0 to obtain the two-layer stochastic resonance model:

Set the noise intensity D=0, Spect(t)=0, N(t)=0, the calculated critical value of A is In the case of A<A _c , the Brownian motion particle hovers around its original position, and cannot realize the transition between the two potential wells, but when the particle is interfered by external noise, even if A<A _c It can also complete the transition between potential wells, which is the occurrence process of stochastic resonance. Substitute A _c into a layer of stochastic resonance model, and set x ₀ (t) = 0, sn ₀ = 0, using the fourth-order Longge The Kutta algorithm solves the one-layer stochastic resonance model and obtains:

$\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; [</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; ]</span>\\ \mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}\end{array}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, the undetermined coefficient:

(k ₁ ) _n ＝a(αx _n-1 (t)) ² b(αx _n-1( t)) ³ +sn _n-1 (4)

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

${<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&alpha;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; sn</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Wherein, x _n (t) is the n-order derivative of x (t), sn _n is the value of the n-order derivative of S (t) at t=0, and a, b are constants set,

Calculate the value of x ₁ (t), x ₂ (t)…x _{n +1} (t), integrate x ₁ (t), x ₂ (t)…x n+1 (t) to get x(t ), and get x( _t ) in the double-layer _stochastic resonance system composed of one-layer stochastic resonance model and two-layer stochastic resonance model. The motion acceleration α1 and the noise D1 corresponding to t1, D1 is a value in D,

by formula $\mathrm{SNR}=\sqrt{2}{\left(\mathrm{\&Delta;\; U}\frac{{4a}^3/27b}{{\mathrm{D.}}_1}\right)}^2{e}^{-{\left(\mathrm{\&Delta;\; U}\right)}^2/{\mathrm{D.}}_1}$ , calculate the signal-to-noise ratio eigenvalue SNR _feature , where, ΔU=a ² /4b;

S5: Divide the calculated 12 SNR feature values into four groups, divide SNR _{feature 3} , SNR _{feature 6} , SNR _{feature 9} , and SNR _{feature 12} into the first group, and divide SNR _{feature 2} , SNR _{feature 4} , SNR feature _{Feature 7} and SNR _{feature 11} are divided into the second group, SNR _{feature 1} and SNR _{feature 5} are divided into the third group, SNR _{feature 8} and SNR _{feature 10} are divided into the fourth group, and the average signal-to-noise ratio of each group is calculated respectively value, get SNR _{average 1} , SNR _{average 2} , SNR _{average 3} , SNR _{average 4} ,

Calculate the error QE _j between each SNR eigenvalue and the SNR average value of the corresponding group, j=1,...,12;

Counting the number M ₁ of SNR eigenvalues satisfying QE _j ≤ 2%, counting the number M ₂ of SNR eigenvalues satisfying QE _j >2%;

S6: if Then the central processing unit judges that the beef sample is not spliced beef, if Then the central processing unit judges that the beef sample is spliced beef, otherwise jump to step S3, and retest the beef sample.

The detection light whose light intensity curve first rises from 0 to the maximum value in a straight line, and then falls from the maximum value to 0 according to a sinusoidal curve is suitable for detecting beef samples with a thickness of 7mm-8mm. In step S6, if and If the two formulas are not established, the sample tray can be controlled to be inserted into the positioning hole adjacent to the positioning hole, and then jump to step S3 to retest the beef sample.

Step S2 comprises the following steps:

S21: the central processing unit controls the operation of the first electromagnet, the sample tray is moved to the front inner side of the rectangular groove by the suction force of the first electromagnet, and the first proximity switch sends a trigger signal;

S22: The central processing unit receives the trigger signal from the first proximity switch, controls the first electromagnet to stop working, controls the third electromagnet at the bottom of the positioning hole closest to the front inner side of the rectangular groove to work, and the third electromagnet generates suction , the positioning head at the bottom of the sample tray is inserted into the positioning hole by the suction force of the third electromagnet, and the second proximity switch in the positioning hole sends a trigger signal;

S23: The central processing unit receives the trigger signal sent by the second proximity switch, and judges that the positioning of the sample tray is successful. At this time, the center point of the sample tray is located directly below the optical transceiver;

S24: the central processing unit reads the instruction input by the user through the touch screen to determine the position of the positioning hole where the sample tray needs to be inserted;

S25: the central processing unit controls the third electromagnet at the bottom of the positioning hole closest to the front inner surface of the rectangular groove to stop working, the sample tray is lifted by buoyancy, and the positioning head at the bottom of the sample tray leaves the positioning hole;

S26: The central processing unit controls the second electromagnet and the third electromagnet at the bottom of the positioning hole to be inserted into the sample tray to work. The sample tray is moved to the top of the positioning hole to be inserted by the suction force of the second electromagnet. Inserted into the positioning hole by the suction force of the third electromagnet, the second proximity switch in the positioning hole sends out a trigger signal. The camera collects the image information of the rectangular groove and sends it to the central processing unit. The central processing unit obtains the position information of the sample tray through image processing. If the sample tray moves backward excessively due to the suction force of the second electromagnet, it moves to the position that needs to be inserted. Behind the hole, the central processing unit adjusts the position of the sample tray through the first electromagnet and the second electromagnet, so that the sample tray remains directly above the positioning hole to be inserted.

In this embodiment, the number M ₁ =1 of SNR eigenvalues satisfying QE _j ≤ 2% is detected, and the number of SNR eigenvalues satisfying QE _j > 2% is M ₂ =11, The beef sample was judged to be spliced beef.

Claims (7)

1. the system of a quick detection splicing beef, it is characterised in that: include controller and testing agency, described controller bag Including CPU (1), touch screen (2) and light source control module (3), described testing agency includes base (4), described base (4) being provided with monitor station (5), described monitor station (5) middle part is provided with rectangular recess (6), and described rectangular recess stores liquid in (6) Body, described liquid is provided with rounded sample tray (7), and the front-end and back-end of described sample tray (7) are respectively equipped with first Permanent magnet and the second permanent magnet, described sample tray (7) bottom is provided with locating dowel (10), and it is fixed that described locating dowel (10) bottom is provided with Potential head (11), described positioning head (11) is made up of ferrimagnet, and the anteromedial surface of described rectangular recess (6) is provided with the first electromagnetism Ferrum (12) and the first proximity switch (18), the rear medial surface of described rectangular recess (6) is provided with the second electric magnet (13), described rectangle The bottom surface of groove (6) is provided with several locating pieces (14), and described locating piece (14) lower section is provided with and drives locating piece (14) to rotate First drives motor (15), and described locating piece (14) is provided with and coordinates with positioning head (11) and to limit positioning head (11) freely rotatable Hole, location (16), the hole, location (16) on described several locating pieces (14) is arranged in a linear from front to back, hole, described location (16) bottom is provided with the 3rd electric magnet (17) and the second proximity switch (33), and described sample tray (7) is arranged over optical transceiver (19), described optical transceiver (19) includes radiation source (20) and optical receiver (21), and described rectangular recess (6) is arranged over taking the photograph As head (26), described CPU (1) respectively with touch screen (2), light source control module (3), the first electric magnet (12), the Two electric magnet (13), the 3rd electric magnet (17), the first proximity switch (18), the second proximity switch (33), the first driving motor (15), optical receiver (21) and photographic head (26) electrical connection, described light source control module (3) is also electrically connected with radiation source (20) Connect.

The system of a kind of quick detection the most according to claim 1 splicing beef, it is characterised in that: described positioning head (11) In flat, the longitudinal section of described positioning head (11) is inverted isosceles trapezoid, the shape in hole, described location (16) and positioning head (11) form fit, hole, described location (16) top is provided with the spigot surface (23) of inclination.

The system of a kind of quick detection the most according to claim 1 splicing beef, it is characterised in that: described rectangular recess (6) distance between medial wall, left and right matches with the diameter of sample tray (7).

4. the system of beef is spliced according to a kind of quick detection described in claim 1 or 2 or 3, it is characterised in that: described light source Control module (3) includes function memory (24) and power amplifier (25), the input of described function memory (24) and central authorities Processing unit (1) electrically connects, and the outfan of described function memory (24) electrically connects with the input of power amplifier (25), described The outfan of power amplifier (25) electrically connects with radiation source (20).

5. the system of beef is spliced according to a kind of quick detection described in claim 1 or 2 or 3, it is characterised in that: described rectangle The hole, location (16) that on groove (6) bottom surface, distance rectangular recess (6) anteromedial surface is nearest is positioned at the underface of optical transceiver (19).

6. a method for quick detection splicing beef, for what beef was spliced in a kind of quick detection described in claim 1 be System, it is characterised in that comprise the following steps:

S1: preparation lamellar beef sample, is placed on beef sample on sample tray, makes beef sample be centrally located at sample carrier The center of dish；

The instruction that S2: CPU is inputted by touch screen according to user, what control sample tray insertion user specified determines Hole, position；

The detection light that S3: CPU sends certain light intensity by light source control module control radiation source is radiated at beef On sample, detect light intensity elder generation from 0 according to ramping maximum, then drop to according to sine curve from maximum 0, optical receiver gathers reflected spectrum data Spect (t), hole, the location institute that then central processing unit controls sample tray inserts The first driving motor work below locating piece, first drives motor to control locating piece rotates 30 degree, makes sample tray level Rotating 30 degree, optical receiver gathers the spectroscopic data of now radiation source point of irradiation, so controls sample tray horizontal rotation 360 Degree, often horizontally rotates 30 degree of spectroscopic datas of detection that stop, thus gathers the spectrum of 12 diverse locations on beef sample Data Spect (t)；

Collect 12 spectroscopic datas Spect (t) are all carried out same data and process by S4: CPU, calculate 12 signal to noise ratio eigenvalues, the data carrying out each spectroscopic data Spect (t) process and comprise the following steps:

Use input signalAs input matrix, potential function V (x, t, α) with It is one layer of accidental resonance model that input signal is worked in coordination with:

Wherein, V (x, t, α) is potential function, and x (t) is Brownian Particles movement locus function, and t is movement time, For periodic sinusoidal signal, N (t) grasps noise in being, A is signal amplitude, and f is signal frequency, and D is outer noise intensity, and ξ (t) is Outer noise,For phase place, α is acceleration of motion,

Calculate the V (x, t, α) first derivative, second dervative and three order derivatives for x (t), and make equation be equal to 0, obtain two Layer accidental resonance model:

Set noise intensity D=0,Spect (t)=0, N (t)=0, the marginal value being calculated A isBy A_cSubstitute in one layer of accidental resonance model, and set x₀(t)=0, sn₀=0, use quadravalence jade for asking rain lattice storehouse One layer of accidental resonance model of tower Algorithm for Solving, obtains:

$x_{n+1}\left(t\right)=x_n\left(t\right)+1/6[{\left(k_1\right)}_n+(2-\sqrt{2}){\left(k_2\right)}_n+(2+\sqrt{2}){\left(k_3\right)}_n+{\left(k_4\right)}_n],$

N=0,1 ..., N-1 (3)

Wherein, undetermined coefficient:

(k₁)_n=a (α x_n-1(t))²-b(αx_n-1(t))³+sn_n-1 (4)

${\left(k_2\right)}_n=a(\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+\frac{{\left(k_1\right)}_{n-1}}{3})-b{(\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+\frac{{\left(k_1\right)}_{n-1}}{3})}^3+s{n}_{n-1}---\left(5\right)$

${\left(k_3\right)}_n=a(\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+\frac{{\left(k_2\right)}_{n-1}}{3})-b{(\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+\frac{\sqrt{2}-1}{3}{\left(k_1\right)}_{n-1}+\frac{2-\sqrt{2}}{3}{\left(k_2\right)}_{n-1})}^3+s{n}_{n+1}---\left(6\right)$

${\left(k_4\right)}_n=a(3\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+{\left(k_3\right)}_{n-1})-b{(\mathrm{\&alpha;}{x}_{n-1}\left(t\right)+\frac{\sqrt{2}}{3}{\left(k_2\right)}_{n-1}+\frac{2+\sqrt{2}}{3}{\left(k_3\right)}_{n-1})}^3+s{n}_{n+1}---\left(7\right)$

Wherein, x_nT () is the n order derivative of x (t), sn_nBeing the n order derivative of S (t) value at t=0, a, b are the constant set,

It is calculated x₁(t), x₂(t)…x_n+1T the value of (), to x₁(t), x₂(t)…x_n+1T () is integrated obtaining x (t), and obtain The resonance moment is produced in the double-deck stochastic resonance system of one layer of accidental resonance model and two layers of accidental resonance model composition to x (t) Position x_mValue and x_mCorresponding acceleration of motion α 1 corresponding for resonance moment t1 with t1 and the noise corresponding with t1 D1, D1 are a value in D,

Pass through formulaIt is calculated signal to noise ratio eigenvalue SNR_Feature, wherein, Δ U=a²/4b；

S5: calculate 12 signal to noise ratio eigenvalues are divided into four groups, by SNR_{Feature 3}、SNR_{Feature 6}、SNR_{Feature 9}、SNR_{Feature 12}It is divided into One group, by SNR_{Feature 2}、SNR_{Feature 4}、SNR_{Feature 7}、SNR_{Feature 11}It is divided into second group, by SNR_{Feature 1}And SNR_{Feature 5}It is divided into the 3rd group, will SNR_{Feature 8}And SNR_{Feature 10}It is divided into the 4th group, and calculates the signal to noise ratio meansigma methods of each group respectively, obtain SNR_{Average 1}、SNR_{Average 2}、 SNR_{Average 3}、SNR_{Average 4},

Calculate error QE between each signal to noise ratio eigenvalue and signal to noise ratio meansigma methods of its corresponding group_j, j=1 ..., 12；

Statistics meets QE_jNumber M of the signal to noise ratio eigenvalue of≤2%₁, statistics meets QE_jThe signal to noise ratio eigenvalue of ＞ 2% Number M₂；

S6: ifThen CPU judges that this beef sample is not splicing beef, if Then CPU judges that this beef sample is splicing beef, otherwise jumps to step S3, beef sample is re-started inspection Survey.

The method of a kind of quick detection the most according to claim 6 splicing beef, it is characterised in that described step S2 includes Following steps:

S21: central processing unit controls the first work of electromagnet, sample tray by the first electromagnet suction action to rectangle At groove anteromedial surface, the first proximity switch sends triggering signal；

S22: CPU receives the triggering signal that the first proximity switch sends, and controls the first electric magnet and quits work, The 3rd work of electromagnet bottom hole, location that command range rectangular recess anteromedial surface is nearest, the 3rd electric magnet produces suction, Positioning head bottom sample tray is inserted this hole, location by the suction of the 3rd electric magnet, and second in this hole, location is close to opening Pass sends triggering signal；

S23: CPU receives the triggering signal that the second proximity switch sends, it is judged that sample tray positions successfully, this Time sample tray central point be positioned at the underface of optical transceiver；

S24: CPU reads user and determines that sample tray needs the hole, location inserted by the instruction that touch screen inputs Position；

The 3rd electric magnet bottom hole, location that S25: central processing unit controls distance rectangular recess anteromedial surface is nearest stops Work, sample tray is floated by buoyancy, and the positioning head bottom sample tray leaves hole, location；

S26: central processing unit controls the second electric magnet and sample tray need that inserts to position the 3rd electromagnetism bottom hole Ironworker makees, and the positioning head bottom sample tray inserts this hole, location, and the second proximity switch in this hole, location sends triggering signal.