CN108051398B - Measuring system for detecting distance of total transmitted light in agricultural products - Google Patents

Abstract

The invention relates to the technical field of agricultural product detection and discloses a measurement system for detecting distance of total transmitted light in agricultural products, which comprises a host, a light source controller, a light source optical fiber probe, a spectrometer optical fiber probe, a camera bellows box body, a fixing unit and a slicing unit, wherein the fixing unit and the slicing unit are arranged in the box body; the slicing unit comprises a cutter and a displacement driving mechanism, and the displacement driving mechanism can drive the cutter to move in the vertical and horizontal directions and pass through the opening; the light source optical fiber probe and the spectrometer optical fiber probe are respectively fixed below and below the sample platform, a through hole is formed in the sample platform, and the light source optical fiber probe, the spectrometer optical fiber probe and the through hole are positioned on a vertical line. The device can effectively detect the detection distance of near-total transmitted light such as near infrared light in agricultural products.

Description

Measurement system for fully transmitted light detection distance in agricultural products

Technical field

The invention relates to the technical field of agricultural product detection, and in particular to a measurement system for detecting distance in agricultural products using fully transmitted light.

Background technique

In recent years, with the improvement of people's quality of life, more and more people are paying more attention to the quality and safety of agricultural products. Optical sensing technology is currently one of the most effective and mature non-destructive testing and evaluation technologies for agricultural product quality and safety, especially near-infrared spectroscopy technology, which is more widely used. However, in order to build a robust and effective prediction and assessment model for the internal quality and safety of agricultural products based on near-infrared spectroscopy, it is crucial to ensure that near-infrared light has a sufficient detection distance in the internal tissues of agricultural products while ensuring the effective life of the light source. At present, there is no device that can automatically and effectively be used to measure the detection distance of near-infrared light inside agricultural products.

Contents of the invention

(1) Technical problems to be solved

An object of the present invention is to provide a measurement system for the detection distance of fully transmitted light in agricultural products to effectively detect the detection distance of nearly fully transmitted light, such as near-infrared light, in agricultural products.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides a measurement system for fully transmitted light detection distance in agricultural products, which includes a host computer, a light source controller, a light source optical fiber probe connected to the light source controller, a spectrometer, and a spectrometer connected to the spectrometer. The connected optical fiber probe of the spectrometer, the camera obscura box, and the fixing unit and the slicing unit arranged in the camera obscura box. The fixing unit includes a sample platform arranged in the middle of the camera obscura box for placing the sample to be measured. Above the sample platform A cutting baffle is provided, and an opening is provided between the cutting baffle and the sample platform. The fixing unit also includes a pressing member for pressing above the sample to be tested; the slicing unit includes a cutter And a displacement driving mechanism connected to the cutter, the displacement driving mechanism can drive the cutter to move in the vertical direction and the horizontal direction respectively and pass through the opening; the optical fiber probe of the light source and the optical fiber probe of the spectrometer One is fixed below the sample platform, and the other is connected to the lifting mechanism. The sample platform is provided with a through hole, and the light source optical fiber probe, the spectrometer optical fiber probe and the through hole are located on a vertical line. ; The host computer is provided with a displacement control module respectively connected to the displacement driving mechanism and the lifting mechanism, and a spectrum acquisition module connected to the spectrometer.

Wherein, L-shaped fixing feet are provided on both sides of the lower end of the cutting baffle. The L-shaped fixing feet include a horizontal part and a vertical part connected to the cutting baffle. The horizontal part is provided with a The elongated fixing hole is connected to the sample platform, and the length direction of the elongated fixing hole is parallel to the horizontal movement direction of the tool.

Wherein, the cutting baffle is further provided with a sliding baffle that is slidably connected up and down with the cutting baffle, and a locking mechanism that locks the sliding baffle and the cutting baffle.

Wherein, the displacement drive mechanism includes a vertical displacement drive mechanism fixed on the bottom plate of the camera obscura, and a horizontal displacement drive mechanism connected to the vertical displacement drive mechanism, and the cutter is connected to the horizontal displacement drive mechanism.

It also includes two support frames, the light source optical fiber probe and the pressing member are connected to one of the support frames, and the support frame is connected to the lifting mechanism; the spectrometer optical fiber probe is connected to the other support frame connect.

Wherein, the support frame includes a vertical support rod, a lateral support rod, and a connecting piece. The connecting piece includes a first connecting part and a second connecting part that is threadedly connected to the first connecting part. The first connecting part The free end of the second connection part is provided with a first through hole for the vertical support rod to pass through, and the free end of the second connecting part is provided with a second through hole for the horizontal support rod to pass through; the support frame also It includes threaded holes provided on both ends of the connecting piece that are respectively connected with the first through hole or the second through hole and fastening bolts that cooperate with the threaded holes; the horizontal support rod is away from the connecting piece One end is provided with a clamping component.

Wherein, the pressing member is a cylindrical structure, the cylindrical structure is provided with internal threads, the light source fiber optic probe is provided with external threads that match the internal threads on the cylindrical structure, and the light source fiber optic probe is located at Inside the cylindrical structure.

Wherein, a sleeve is provided below the through hole, the axis of the sleeve is collinear with the axis of the through hole, and the optical fiber probe of the spectrometer is located in the sleeve.

Wherein, the cutter includes a horizontal cutting part and a lower protruding part connected to an end of the horizontal cutting part away from the cutting baffle.

Wherein, the camera obscura is provided with only one wiring hole, and the data lines of the spectrometer, the displacement driving mechanism, the lifting mechanism, and the light source optical fiber probe are all led out through the wiring hole.

(3) Beneficial effects

The invention provides a measurement system for detecting the distance of fully transmitted light in agricultural products, which can automatically realize accurate slicing of the sample to be tested. At the same time, during the slicing process, the fully transmitted light spectrum signal of the sample to be tested is measured at different thicknesses. It can be acquired by the spectrum acquisition module in real time. By observing the spectral signal displayed by the acquisition module, it is very convenient to know the detection distance of the fully transmitted light in the sample to be measured and which region of the spectrum segment can more effectively penetrate the sample to be analyzed, thereby Helps build a more robust and accurate sample quality and safety spectral analysis model.

Description of the drawings

Figure 1 is a schematic structural diagram of a measurement system for detecting distance in agricultural products with fully transmitted light according to the present invention.

Figure 2 is a schematic structural diagram of the interior of the camera obscura in Figure 1;

Figure 3 is a schematic structural diagram of the interior of the camera obscura shown in Figure 2 seen from another angle;

Figure 4 is a schematic structural diagram of the support frame in Figure 2;

Figure 5 is a working schematic diagram 1 of a measurement system for fully transmitted light detection distance in agricultural products in Figure 1;

Figure 6 is a working schematic diagram 2 of a measurement system for fully transmitted light detection distance in agricultural products in Figure 1;

Figure 7 is a working schematic diagram 3 of a measurement system for fully transmitted light detection distance in agricultural products in Figure 1;

Figure 8 is a working schematic diagram 4 of a measurement system for detecting distance in agricultural products using fully transmitted light in Figure 1 .

In the picture, 1: Dark box cabinet; 2: Light source controller; 3: Host; 4: Light intensity adjustment button; 5: Wiring hole; 6: Sample platform; 7: Lift driver; 8: Horizontal displacement driver; 9: Vertical displacement driver; 10: Vertical displacement connector; 11: Lift connector; 12: Horizontal displacement connector; 13: Spectrometer; 14: Spectrometer fiber optic probe; 15: Light source fiber optic probe; 16: Cutting baffle; 17: Sample to be tested; 18: pressing piece; 19: first support frame; 20: second support frame; 21: receiving chute; 22: support frame fixing piece; 23: sleeve; 24: cutter; 25: first L-shaped fixed plate; 26: second L-shaped fixed plate; 27: third L-shaped fixed plate; 28: sliding baffle; 29: elongated hole; 30: cutting baffle fixing hole; 31: L-shaped fixing foot; 32: Vertical support rod; 33: Horizontal support rod; 34: Connector; 35: Clamping component; 36: Threaded hole; 37: Sample slice.

Detailed ways

Specific implementations of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the referred devices or components. Must have a specific orientation, be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

1 to 4 illustrate a preferred embodiment of a measurement system for fully transmitted light detection distance in agricultural products according to the present invention. As shown in the figure, the measurement and analysis system includes a host computer 3, a light source controller 2 and a light source optical fiber probe 15 connected to the light source controller 2, a spectrometer 13 and a spectrometer optical fiber probe 14 connected to the spectrometer 13, a dark box 1 and The fixing unit and the slicing unit are arranged in the camera obscura box 1. The fixing unit includes a sample platform 6 provided in the middle of the camera obscura box 1 for placing the sample 17 to be tested. A cutting baffle 16 is provided above the sample platform 6. An opening is provided between the plate 16 and the sample platform 6. The function of the cutting baffle 16 is to hold the sample 7 tightly when it is cut by the cutter 24; the fixing unit also includes a press for pressing against the sample 17 to be tested. Fastener 18; the slicing unit includes a cutter 24 and a displacement drive mechanism respectively connected to the cutter 24. The displacement drive mechanism can drive the cutter 24 to move in the vertical and horizontal directions respectively and can pass through the opening, that is, the length of the opening. and height are respectively greater than the width and height of the cutter 24, so that the cutter 24 can pass through the opening and successfully complete the cutting task. The spectrometer optical fiber probe 14 is fixed below the sample platform 6. The light source optical fiber probe 15 is connected to the lifting mechanism to press against the sample 17 to be measured. The sample platform 6 is provided with a through hole. The light source optical fiber probe 15 and the spectrometer optical fiber are The probe 14 and the through hole are located on a vertical line; the host 3 is provided with a displacement control module connected to the displacement drive mechanism and the lifting mechanism respectively to control the horizontal displacement and vertical displacement of the tool 24 and the vertical displacement of the light source fiber probe 15 displacement, the host computer 3 is also provided with a spectrum collection module connected to the spectrometer 13 for real-time collection of transmitted light spectrum data of the sample 17 to be measured.

Specifically, the cutting baffle 16 is located directly behind the sample to be tested 17 and is close to the sample to be tested 17 to facilitate the cutter 24 to slice the sample to be tested 17 . Preferably, L-shaped fixing feet 31 are provided on both sides of the lower end of the cutting baffle 16 . The L-shaped fixing feet 31 include a horizontal part and a vertical part connected to the cutting baffle 16 . The horizontal part is provided with an L-shaped fixing foot 31 connected to the sample platform 6 The length direction of the long fixed hole is parallel to the horizontal movement direction of the cutter 24. The measuring device can adjust the position of the cutting baffle 16 on the sample platform 6 through the long fixed hole on the L-shaped fixed foot 31. front-to-back distance to accommodate different sizes of samples to be tested17. In addition, the cutting baffle 16 is also provided with a sliding baffle 28 that can slide up and down relative to the cutting baffle 16 , and a locking mechanism that locks the sliding baffle 28 and the cutting baffle 16 . Specifically, elongated holes 30 are provided on both sides of the lower end of the cutting baffle 16, and sliding baffle fixing holes 29 corresponding to the elongated holes 30 are provided on both sides of the sliding baffle 28. The cutting baffle 16 and the sliding baffle The plate 28 is connected by bolts passing through the elongated hole 30 and the sliding baffle fixing hole 29, and when the bolts are loosened, the sliding baffle 28 can slide up and down relative to the cutting baffle 16 to control the size of the lower opening of the cutting baffle 16 to adapt Samples to be tested 17 different slice thicknesses.

The displacement drive mechanism includes a vertical displacement drive mechanism fixed on the bottom plate of the camera obscura 1 and a horizontal displacement drive mechanism connected to the vertical displacement drive unit. The cutter 24 is connected to the horizontal displacement drive unit. Specifically, the vertical displacement driving unit includes a second L-shaped fixing plate 26 fixed on the bottom of the camera obscura, a vertical displacement driver 9 connected to the second L-shaped fixing plate 26, and a vertical displacement connector 10, wherein the vertical displacement The vertical displacement connector 10 can move vertically under the drive of the vertical displacement driver 9; the horizontal displacement drive mechanism includes a first L-shaped fixed plate 25 connected to the vertical displacement connector 10, and the first L-shaped fixed plate 25 The horizontal displacement driver 8 and the horizontal displacement connector 12 are connected. The horizontal displacement connector 12 is connected to the cutter 24. The horizontal displacement connector 12 can move horizontally under the driving of the horizontal displacement driver 8, thereby driving the cutter 24 to move in the horizontal direction. , in addition, since the first L-shaped connecting plate 25 is connected to the vertical displacement connector 10, when the vertical displacement connector 10 moves vertically driven by the vertical displacement driver 9, it can drive the cutter 24 to move in the vertical direction. .

The lifting mechanism includes a third L-shaped fixed plate 27 fixed on the bottom of the camera obscura 1, a lifting driver 7 connected to the third L-shaped fixed plate 27, and a lifting connector 11. The lifting connector 11 is connected to the light source optical fiber probe 15 Connection, in which the lifting connector 10 can move vertically under the drive of the lifting driver 7, thereby driving the light source fiber probe 15 to move vertically so as to press against the top of the sample 17 to be measured.

It should be noted that those skilled in the art should understand that in some other embodiments of the present invention, the light source fiber probe 15 can also be fixed below the sample platform 6 , and the spectrometer fiber probe 14 is connected to the lifting mechanism to lift the light source through the lifting mechanism. The mechanism presses against the top of the sample 17 to be tested.

Further, the measurement system also includes two support frames: a first support frame 19 and a second support frame 20. The spectrometer fiber probe 14 is connected to the first support frame 19; the light source fiber probe 15 and the pressing member 18 are connected to the second support frame. The second supporting frame 20 is connected to the lifting connecting piece 11 of the lifting mechanism through the supporting frame connecting piece 22 . Specifically, as shown in Figure 4, each support frame includes a vertical support rod 32, a horizontal support rod 33, and a connecting piece 34, wherein the connecting piece 34 includes a first connecting part and a third connecting part that is threadedly connected to the first connecting part. Two connecting parts, the free end of the first connecting part is provided with a first through hole for the vertical support rod 32 to pass through, and the free end of the second connecting part is provided with a second through hole for the horizontal support rod 33 to pass through; The support frame also includes threaded holes 36 provided on both ends of the connecting member 34 that are respectively connected to the first through holes or the second through holes, and are used in conjunction with the threaded holes 36 to connect the vertical support rods 32 or the horizontal support rods 33 Tighten the fastening bolts. In addition, a clamping assembly 35 is provided at one end of the horizontal support rod 33 away from the connecting piece 34 . In this embodiment, the clamping assembly 35 includes a first clamping plate connected to the horizontal support rod 33, a second clamping plate and a rod connected to the first clamping plate. The second clamping plate is provided with a rod supply. In addition, the second clamping plate is also provided with a threaded hole and a fastening bolt that matches the threaded hole, and is used to secure the device placed between the first clamping plate and the second clamping plate. The optical fiber probe 14 of the spectrometer or the pressing piece 18 is tightened. Through the cooperation of various components of the support frame, the measurement device can flexibly adjust the pressing member 18 and the spectrometer optical fiber probe 14 in the vertical direction, transverse direction and rotation angle to meet the measurement requirements for different samples and different 'distance measurements'.

Preferably, the pressing member 18 is a cylindrical structure, the cylindrical structure is provided with internal threads, the light source fiber optic probe 15 is provided with external threads that match the internal threads on the cylindrical structure, and the light source fiber optic probe 15 is located inside the cylindrical structure. The measurement system installs the light source fiber optic probe 15 inside the pressing member 18 through a threaded connection, so that the relative positions of the light source fiber optic probe 15 and the pressing member 18 can be flexibly set, thereby better adapting to different types of samples to be measured. When measuring the near-infrared detection distance of 17, for example, if the surface of a fruit sample is arc-shaped, then the top surface of the light source optical fiber probe 15 and the top surface of the pressing member 18 cannot be on the same horizontal plane.

In addition, it should be noted that those skilled in the art should understand that in some other embodiments of the present invention, the light source fiber probe 15 can also be fixed through the clamping assembly of the support frame.

Furthermore, a sleeve 23 is provided below the through hole on the sample platform 6 , where the axis of the sleeve 23 is collinear with the axis of the through hole, and the spectrometer optical fiber probe 14 is located in the sleeve 23 . In order to effectively avoid the impact of possible stray light on near-infrared spectrum collection, it helps to obtain spectral data with a higher signal-to-noise ratio.

The host 3 is provided with a displacement control module connected to the displacement drive mechanism and the lifting mechanism respectively, which is used to control the moving distance of the tool 24 and the moving distance of the pressing member. The host 3 is also provided with a spectrum acquisition module connected to the spectrometer. It is used to automatically collect the transmitted light spectrum data of the sample 17 to be tested in real time. The displacement control module can realize accurate slicing of the sample 17 to be tested. At the same time, during the slicing process, the diffuse reflection spectrum signals of the sample 17 to be tested at different thicknesses can be passed through The spectrum acquisition module is used to accurately analyze the radiation depth of diffuse reflected light in the agricultural products to be tested.

Further, it is preferred that the cutter 24 includes a horizontal cutting portion and a lower protruding portion connected to an end of the horizontal cutting portion away from the cutting baffle 16, so that the sample slices 37 cut by the cutter 24 are pushed forward by the lower protruding portion. move.

In order to avoid the interference of external light on effective spectrum collection, it is preferable that there is only one wiring hole 5 on the camera obscura box 1. The data lines of the spectrometer 13, the displacement drive mechanism and the lifting mechanism inside the camera obscura box 1 all pass through this wiring hole. 5 is connected to the outer host 3, and the data line of the light source optical fiber probe 15 is also connected to the light source controller 2 through the wiring hole 5.

In addition, the measuring device also includes a receiving chute 21 fixed on the bottom of the camera obscura 1 . The receiving chute 21 is located at the rear of the cutting baffle 16 and is used to collect the sample slices 37 after the sample 17 to be tested is cut. .

When in use, first adjust the light source fiber probe 15 and the spectrometer fiber probe 14 to be on the same vertical line. The sample 17 to be analyzed is placed on the sample platform 6 and located between the light source fiber probe 15 and the spectrometer fiber probe 14. Further adjust the first The support frame 19 brings the top end of the spectrometer fiber probe 14 close to the sample 17 to be analyzed. The second support frame 20 is adjusted so that the bottom end of the light source fiber probe 15 is close to the sample 17 to be analyzed, and the pressing member 18 compresses the sample 17 to be measured. Adjust the cutting baffle. 16 position so that it can press the sample 17 to be tested, adjust the knife 24 to determine the thickness of the sample 17 to be tested each time, and adjust the size of the opening on the lower side of the cutting baffle 16 to facilitate the knife 24 to smoothly pass through and complete the cutting of the sample 17 to be tested. , adjust the light intensity adjustment button 4 of the light source controller 2 to select an analysis light source of appropriate intensity.

After the adjustment is completed, close the door of the camera obscura 1 to form a dark room inside the box to avoid interference of external stray light on the effective spectral signal. Then, open the spectrum acquisition module and displacement control module on the host 3, and set them. Spectral acquisition parameters and displacement parameters of the tool, light source fiber optic probe 15, and compression piece. Here, we take one slice and spectrum collection as an example. First, under the control of the displacement control module, the horizontal displacement driver 8 drives the cutter 24 to move along the direction A and cut the sample 17 to be tested. The sample 17 to be tested is completely cut through, and the cutter 24 continues to move along the cutting direction A. Below the cutter 24 The sample slice 37 moves forward under the push of the lower protrusion of the cutter 24 (as shown in Figure 6), until the sample slice 37 falls into the receiving chute 21 by its own gravity G (as shown in Figure 7). At this time, the tool 24 automatically returns to the initial position under the control of the horizontal displacement driver 8. As shown in Figure 8, when the cutter 24 returns to the initial position, the sample 17 to be tested will automatically fall due to the removal of the sample slice 37 and continue to be attached to the sample platform 6. At this time, the lifting drive mechanism 7 is in the displacement control module. Under the control of the control software, the light source optical fiber probe 15 and the pressing member 18 are lowered by a distance of the same thickness as the sample slice 37 (the descending distance is preset in the control software). Subsequently, the spectrum acquisition module automatically collects spectral data to obtain the first spectrum. data curve.

It should be noted that since the original sample is thick, light cannot directly penetrate the sample to be measured 17, so all data on the spectral curve are 0. As the second, third, and so on cutting is carried out automatically, until a certain spectrum collection finds a non-zero value on the spectrum curve, it indicates that the boundary of the light in the sample is destroyed, that is to say, the light penetrates the sample. The thickness of the sample 17 to be measured at this time is the effective penetration depth of light in the sample 17 to be measured. At the same time, further cutting and spectral collection can also continue to finely analyze which spectral segments of light can effectively penetrate under a certain thickness. .

As mentioned above, when measuring the detection distance of the entire light in the sample 17 to be measured, just simply set the spectrum collection parameters and the movement parameters of the cutter 24 on the host 3, and the system can automatically complete the collection of sample slicing and spectral data. The process is completed automatically, which is simple and convenient, with fast test and analysis speed and high precision.

The present invention is particularly suitable for studying the measurement of light detection distance in some agricultural products such as apples, pears, potatoes, onions, etc., and based on the research results, it can construct a more robust agricultural product quality and safety assessment model and develop more effective detection equipment.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. within.

Claims (10)

1. A measurement system for detecting distance of fully transmitted light in agricultural products, which is characterized in that it includes a host computer, a light source controller, a light source optical fiber probe connected to the light source controller, a spectrometer, and a spectrometer optical fiber probe connected to the spectrometer. , a camera obscura box and a fixing unit and a slicing unit arranged in the camera obscura box. The fixing unit includes a sample platform provided in the middle of the camera obscura box for placing the sample to be tested, and a cutting baffle is provided above the sample platform. , an opening is provided between the cutting baffle and the sample platform, the fixing unit also includes a pressing member for pressing above the sample to be tested; the slicing unit includes a cutter and is connected to the cutter A displacement driving mechanism, the displacement driving mechanism can drive the tool to move in the vertical direction and the horizontal direction respectively and pass through the opening; one of the light source optical fiber probe and the spectrometer optical fiber probe is fixed on the Below the sample platform, another one is connected to the lifting mechanism. A through hole is provided on the sample platform, and the light source optical fiber probe, the spectrometer optical fiber probe and the through hole are located on a vertical line; inside the host computer There is a displacement control module connected to the displacement driving mechanism and the lifting mechanism respectively, and a spectrum collection module connected to the spectrometer. 2. The measurement system for fully transmitted light detection distance in agricultural products as claimed in claim 1, characterized in that L-shaped fixing feet are provided on both sides of the lower end of the cutting baffle, and the L-shaped fixing feet It includes a horizontal part and a vertical part connected to the cutting baffle. The horizontal part is provided with an elongated fixing hole connected to the sample platform, and the length direction of the elongated fixing hole is parallel to the cutter. Horizontal movement direction. 3. The measurement system for fully transmitted light detection distance in agricultural products as claimed in claim 2, characterized in that the cutting baffle is further provided with a sliding baffle that is slidably connected up and down with the cutting baffle, and a locking mechanism for locking the sliding baffle and the cutting baffle. 4. The measurement system for fully transmitted light detection distance in agricultural products as claimed in claim 1, characterized in that the displacement drive mechanism includes a vertical displacement drive mechanism fixed on the bottom plate of the camera obscura, and A horizontal displacement driving mechanism is connected to the vertical displacement driving mechanism, and the cutter is connected to the horizontal displacement driving mechanism. 5. The measuring system for fully transmitted light detection distance in agricultural products as claimed in claim 1, further comprising two support frames, the light source optical fiber probe and the pressing member and one of the supports. The support frame is connected to the lifting mechanism; the optical fiber probe of the spectrometer is connected to another support frame. 6. The measurement system for fully transmitted light detection distance in agricultural products as claimed in claim 5, wherein the support frame includes a vertical support rod, a horizontal support rod, and a connecting piece, and the connecting piece includes a third A connecting part and a second connecting part threadedly connected to the first connecting part. The free end of the first connecting part is provided with a first through hole for the vertical support rod to pass through. The second connecting part The free end of the connecting piece is provided with a second through hole for the horizontal support rod to pass through; the support frame also includes a second through hole provided on both ends of the connecting piece respectively connected with the first through hole or the second through hole. Communicated threaded holes and fastening bolts matched with the threaded holes; a clamping component is provided at one end of the horizontal support rod away from the connecting piece. 7. The measurement system for fully transmitted light detection distance in agricultural products as claimed in claim 5, characterized in that the pressing member is a cylindrical structure, the cylindrical structure is provided with internal threads, and the light source The optical fiber probe is provided with an external thread that matches the internal thread on the cylindrical structure, and the light source optical fiber probe is located inside the cylindrical structure. 8. The measuring system for fully transmitted light detection distance in agricultural products as claimed in claim 5, characterized in that a sleeve is provided below the through hole, and the axis of the sleeve is in line with the axis of the through hole. The axes are collinear, and the optical fiber probe of the spectrometer is located in the sleeve. 9. The measuring system for fully transmitted light detection distance in agricultural products according to any one of claims 1 to 8, characterized in that the cutter includes a horizontal cutting part and a cutting tool far away from the horizontal cutting part. Cut the lower tab where one end of the fender connects. 10. The measurement system for fully transmitted light detection distance in agricultural products according to any one of claims 1 to 8, characterized in that the dark box body is provided with only one wiring hole, and the spectrometer The data lines of the displacement drive mechanism, the lifting mechanism, and the light source optical fiber probe are all led out through the wiring hole.