CN202928947U - Small spherical fruit sugar-acid ratio rapid non-destructive testing device with weighing function - Google Patents

Abstract

The utility model relates to a sugar-acid ratio instant nondestructive detection device with a weighing function for a small spherical fruit. The sugar-acid ratio instant nondestructive detection device has the characteristics of being instant in discrimination speed, high in detection precision, wide in applicable scope and simple and convenient to operate. The technical scheme is as follows: the sugar-acid ratio instant nondestructive detection device with the weighing function for the small spherical fruit comprises a light source, a computer, a touch display screen and a spectrograph. The sugar-acid ratio instant nondestructive detection device is characterized by further comprising a weighing-lighting system which consists of a weighing system and a lighting system, wherein the weighing system comprises a pedestal, a weighing sensor and a partition plate; a round hole is formed in the center of the partition plate; the lighting system comprises an annular light splitter, a flexible light shield, a condensing lens, a temperature sensor and a flexible seat cushion; an annular lighting area is formed on the end surface of the top end of the annular light splitter, and a large screw hole is formed on the wall part of the annular light splitter; the condensing lens is positioned by a lens optical fiber connector in a backing way; and emergent optical fibers are fixed below the condensing lens through the lens optical fiber connector.

Description

Small spherical fruit sugar-acid ratio rapid non-destructive testing device with weighing function

technical field

The utility model relates to a detection device, in particular to a device for rapid and nondestructive detection of the quality (sugar-acid ratio, weight) of small spherical fruits (such as peaches).

Background technique

China is a large agricultural country. In recent years, fruit production has continued to increase. With the continuous improvement of people's living standards, consumers pay more and more attention to the internal quality of fruits such as taste and sugar-acid ratio (sugar content) when purchasing fruits. compared to acidity).

The sugar-acid ratio refers to the ratio of total sugar (soluble solids) to total acid (titratable acid) in food or food raw materials, and is an important indicator for evaluating fruit maturity and fruit quality. The sugar-acid ratio can affect the taste of food, and the taste of food is often controlled by adjusting the ratio in food production. If juice, each juice has its own fixed sugar-acid ratio to achieve the best taste. The sugar-acid ratio will also affect the quality of food. A certain acidity will affect the growth of microorganisms in food and prolong the shelf life.

The existing fruit quality identification methods mainly include:

The sensory identification method mainly relies on vision, touch, and smell to identify. The accuracy of judgment is affected by many factors such as emotional factors, emotional factors, experience, physical health status, identification environment and so on.

The physical and chemical analysis method is to squeeze the juice from the fruit, and then use the acidity meter and the sugar meter to measure it. The advantage of this method is that it has been generally recognized as a conventional instrumental analysis method, but the disadvantages are time-consuming, labor-intensive, high cost, long cycle, and the need for destructive treatment of the samples to be tested.

Therefore, it is of great significance to study the rapid and non-destructive detection of fruit internal quality devices for domestic sales and import and export of fruits. At present, some basic research has been carried out on non-destructive testing equipment for internal fruit quality at home and abroad, but not many of them can be put into actual production and application.

In Japanese Patent No.09-089767, a portable device for detecting apple sugar content based on near-infrared technology is described. Absorbance, secondary differential processing, and using the spectral values at 912nm and 888nm to establish a prediction model, it is considered that it can be used for on-site detection of fruit quality on orchard trees. However, in this structure, the spectroscopic accuracy is easily affected by external factors (vibration, temperature, etc.), resulting in low detection accuracy.

Chinese Patent No.200510056732.3 describes a portable non-destructive detection device for the internal quality of fruit. In this device, a circle of LED light source is used to illuminate the fruit, and the photodetectors on the top and bottom are used to detect the near-infrared light transmitted from the fruit, and realize the detection and classification of fruit quality (water core disease degree) by establishing a prediction model. Because the LED light source is a light source with a specific wavelength, the quality of some fruits cannot be fully obtained, so there are certain defects in the application; in addition, due to the difficulty of heat dissipation, there is also the problem of affecting the quality of the fruit.

In addition, fruit weight is the basis of fruit measurement, and there is no device that can realize fruit weight and internal quality detection at the same time.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the above-mentioned background technology and provide a device suitable for detecting the sugar-acid ratio and weight of small spherical fruits. features.

The technical scheme that the utility model adopts is as follows:

A small spherical fruit-sugar-acid ratio rapid non-destructive testing device with weighing function, including a light source and a computer connected through a data line, a touch screen and a spectrometer; it is characterized in that the device is also equipped with a weighing-illumination system, and the light source emits The detection light is input to the weighing-illumination system through the incident optical fiber, and the spectrometer receives the transmitted light output by the weighing-illumination system through the outgoing optical fiber;

The weighing-illumination system is composed of a weighing system and an illumination system;

The weighing system includes a base, a load cell fixed above the base, and a partition fixed above the load cell; the center of the partition is formed with a circular hole for laying outgoing optical fibers;

The illumination system includes an annular beam splitter fixed on a partition, a flexible shade installed on the top of the annular beam splitter, a condenser lens positioned in the center of the annular beam splitter, a temperature sensor and a flexible seat fixed on the top end of the annular beam splitter pad; the top end surface of the annular beam splitter is formed with a circular light-emitting area for emitting detection light, and the wall is formed with a large screw hole connected to the incident optical fiber and introduced into the detection light; the condenser lens is connected by a lens optical fiber The outgoing optical fiber is also fixed under the condenser lens by a lens fiber connector, so as to receive the transmitted light emitted by the condenser lens and transport it to the spectrometer.

The lens fiber optic connector is in the shape of a funnel with a large head and a small tail. The inner wall of the head is formed with internal threads for matching the two inner sleeves; the inner wall of the tail is formed with internal threads for fixing the outgoing optical fiber; the outer surface of the tail There are also three convex light holes uniformly distributed in the circumferential direction, and each convex light hole is matched with a long screw extending radially from the ring beam splitter.

The condensing lens is positioned on the upper part of the lens fiber optic connector by an inner sleeve with an adjustable distance.

The light source is a halogen light source with adjustable power.

The working process of the present utility model is:

First start the embedded computer and open the corresponding detection software, set the parameters, and select the fruit quality detection module.

When the checked fruit (such as peaches) is put on the flexible shading cover 3-2, its weight deforms the load cell 3-10 installed between the base 3-11 and the dividing plate 3-9, and outputs the same The electric signal proportional to the weight is transmitted to the embedded computer 1 and processed to obtain the weight of the fruit. The detection software will automatically issue instructions to adjust the power of the light source 5 according to the weight of the fruit and the preset light source power adjustment model, so that it is suitable for the real-time detection of the fruit. The light emitted by the near-infrared light source enters the body of the ring beam splitter 3-1 through the incident optical fiber 4 from the large screw hole 3-1-2, and then passes through the body to reach the top of the ring beam splitter, where it is dispersed into a ring light and irradiated to the bottom of the fruit for a circle position; after part of the annular light is diffusely transmitted inside the fruit, a part of the transmitted light enters the condenser lens 3-4 after being refracted, and the condenser lens 3-4 irradiates the received transmitted light to the head of the outgoing optical fiber 6 after being focused (this The transmitted light at the time has already carried information such as the sugar-acid ratio of the fruit); the transmitted light can be processed by the spectrometer 7 to obtain a spectral data, and then transmitted to the embedded computer; at the same time, installed in the ring beam splitter 3-1 The temperature sensor 3-3 above also obtains the temperature value during detection and transmits it to the embedded computer 1. The embedded computer 1 performs temperature correction on the obtained spectral information according to the temperature and the preset temperature correction model, and then extracts the spectral information under the effective wavelength from the corrected spectrum and inputs it into the sugar-acid ratio detection model to calculate the sugar content of the fruit. According to the sugar-acid ratio, the fruit is divided into grades (such as excellent, good, average, poor, etc.), and finally the touch screen will display the sugar-acid ratio, grade, weight and other information of the fruit.

The beneficial effects of the utility model are:

The utility model has fast identification speed and high precision, is suitable for on-site analysis, and can quickly, accurately and nondestructively identify the sugar-acid ratio and weight of small spherical fruits. The power of the halogen light source used is adjustable, and the detection software automatically sends instructions to the control system to adjust the power according to the weight information of the fruit to adapt to the quality detection of different fruits, and automatically performs temperature correction to improve the detection accuracy. The light source is split by the ring beam splitter, which is strong in applicability, stable and reliable. In addition, there are no moving parts during the measurement, which solves the problem of inaccurate fruit quality identification results caused by the movement of the optical splitter and optical fiber in the existing device; and the operation is simple, and the operator can realize independent detection without professional knowledge.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the utility model.

Fig. 2a is a schematic cross-sectional structure diagram of the weighing-lighting system in the embodiment of the present invention.

Fig. 2b is a schematic diagram of the enlarged structure of part A in Fig. 2a.

Fig. 2c is a schematic diagram of the enlarged structure of part B in Fig. 2a.

Fig. 3 is a schematic perspective view of the three-dimensional structure of the flexible shade in the embodiment of the present invention.

Fig. 4a is one of the three-dimensional structural schematic diagrams of the annular beam splitter in the embodiment of the present invention.

Fig. 4b is the second schematic diagram of the three-dimensional structure of the annular beam splitter in the embodiment of the present invention.

Fig. 5a is one of the three-dimensional structural schematic diagrams of the lens optical fiber connector in the embodiment of the present invention.

Fig. 5b is the second schematic diagram of the three-dimensional structure of the lens optical fiber connector in the embodiment of the present invention.

Fig. 6 is a schematic diagram of the three-dimensional structure of the inner sleeve in the embodiment of the present invention.

Fig. 7 is a schematic diagram of the three-dimensional structure of the partition in the embodiment of the present invention.

In the figure: 1. Computer; 2. Touch screen; 3. Weighing-illumination system; 4. Incident fiber; 5. Light source; 6. Outgoing fiber; 7. Spectrometer; , flexible hood; 3-3, temperature sensor; 3-4, flexible seat cushion; 3-5, condenser lens; 3-6, inner sleeve; 3-7, lens fiber optic connector; 3-8, long Screw; 3-9, clapboard; 3-10, weighing sensor; 3-11, base; 3-1-1, circular light-emitting area; 3-1-2, large screw hole; 3-7-1 , Convex light hole.

Detailed ways

The portable fruit sugar-acid ratio non-destructive detection device with weighing function provided by the utility model is based on the intersection of multiple technologies such as spectral analysis technology, optical fiber sensing technology, and chemometrics technology to select the most important index sugar-acid in the internal quality of fruit. As a detection and evaluation index, it also has a weighing function.

The utility model will be further described below in conjunction with the accompanying drawings of the description, but the utility model is not limited to the following embodiments.

The small spherical fruit-sugar-acid ratio rapid nondestructive testing device with weighing function shown in Figure 1 includes a computer 1 (preferably an embedded computer), a touch screen 2, a weighing-illumination system 3, an incident optical fiber 4, and an outgoing optical fiber 6 , a light source 5 (preferably a power-adjustable light source), a spectrometer 7; both the computer and the touch screen, and the computer and the spectrometer are connected through data lines.

As shown in Figure 2a, the weighing-illumination system 3 is composed of a weighing system and an illumination system.

The weighing system includes a base 3-11, a load cell 3-10, and a partition 3-9. The base 3-11 is a fixed part of the entire weighing-lighting system, and a load cell 3-10 (chip temperature sensor, standard accessory, available for purchase) is fixed above the base, which can be used to weigh the detected fruit after zero adjustment the weight of. A partition 3-9 is fixed above the load cell 3-10, and the partition 3-9 separates the upper illumination system from the lower weighing system. There is a circular hole in the center of the partition for guiding and laying the outgoing optical fiber 6 .

The illumination system includes a hollow annular beam splitter 3-1, a flexible shade 3-2, a temperature sensor 3-3, a flexible cushion 3-4, a condenser lens 3-5, an inner sleeve 3-6, and a lens fiber Connector 3-7, long screw 3-8.

As shown in FIG. 2a, FIG. 2c, and FIG. 4, the annular beam splitter 3-1 is fixed on the partition plate 3-9 through three threaded holes on the bottom surface, and the large circular holes of the two are coaxial. The large circular hole in the middle of the annular beam splitter 3-1 is used to install and position the optical lens connector 3-7; the outer peripheral surface of the upper part is provided with external threads for fixing the flexible light shield 3-2; the lower cylindrical surface has three radial radial distributions The small threaded hole is used to fix the long bolt, so as to effectively fix the lens fiber optic connector 3-7; there is a large screw hole 3-1-2 on the side, which is used to fix the incident optical fiber 4; there is a circular light-emitting area on the top surface 3-1-1, the light from the incident optical fiber 4 enters the body of the ring beam splitter from the large screw hole 3-1-2, and then spreads out through the ring-shaped light-emitting area 3-1-1; the top surface is equipped with a Small patch-type temperature sensor 3-3 (standard accessory, available for purchase) and a ring-shaped flexible seat cushion 3-4 (used to support the fruit, while preventing the light from the ring light source from directly entering the condenser lens) , The flexible seat cushion can usually be made of rubber.

The aforementioned annular beam splitter is preferably made of a material that facilitates light transmission (such as optical-grade acrylic/PC material; available from outsourcing).

As shown in Figure 2a, Figure 2c, and Figure 3, the flexible sunshade 3-2 is made of light-shielding, soft and easily deformable materials (such as black rubber), and the main body is made into a pleated shape; a cylindrical plastic ring at the bottom is opened. There are internal threads for connection with ring beam splitters. When the fruit is placed in the flexible shading cover 3-2, the flexible shading cover will be compressed and deformed, and the outer lip of the head can be closely attached to the surface of the fruit, so that external light can be isolated and the surface of the fruit can be protected from damage.

As shown in Fig. 2a, Fig. 2b, and Fig. 5, the lens optical fiber connector 3-7 is funnel-shaped with a large top and a small bottom (the diameter of the head is large and the diameter of the tail is small). Internal threads are formed on the inner wall of the head for fixing two inner sleeves 3-6 (the outer circumference of the inner sleeves is formed with matching external threads), and the condenser lens can be fixed between the two inner sleeves 3-5, and the up and down position of the condenser lens can be adjusted according to the needs; the tail is also provided with an internal thread for fixing the outgoing fiber (fixed with a general fiber optic bolt); there are three circumferentially uniform convex light holes on the outside of the small-diameter cylinder at the tail 3 -7-1, the long screw 3-8 radially extends into the convex optical hole 3-7-1 through the threaded hole on the side of the annular beam splitter 3-1, so that the lens fiber connector 3-7 can be fixed.

Claims (4)

1. A small spherical fruit sugar-acid ratio rapid non-destructive testing device with weighing function, including a light source (5), a computer (1), a touch screen (2) and a spectrometer (7) connected through a data line; it is characterized in that the The device is also equipped with a weighing-illumination system, the detection light emitted by the light source enters the weighing-illumination system (3) through the incident optical fiber (4), and the spectrometer receives the weighing-illumination system through the outgoing optical fiber (6). output transmitted light; The weighing-illumination system is composed of a weighing system and an illumination system; The weighing system includes a base (3-11), a load cell (3-10) fixed above the base, and a partition (3-9) fixed above the load cell; The circular hole for laying the outgoing optical fiber; The illumination system includes an annular beam splitter (3-1) fixed on a partition, a flexible shading cover (3-2) installed on the top of the annular beam splitter, a condenser lens (3-5) positioned at the center of the annular beam splitter ) and a temperature sensor (3-3) and a flexible cushion (3-4) fixed on the top end surface of the annular beam splitter; a circular light-emitting area (3-3) for emitting detection light is formed on the top end surface of the annular beam splitter -1-1), the wall is made with a large screw hole (3-1-2) that connects the incident optical fiber and introduces the detection light; the condenser lens is held and positioned by a lens fiber connector (3-7), so The outgoing optical fiber is also fixed below the condensing lens by a lens fiber connector, so as to receive the transmitted light emitted by the condensing lens and transport it to the spectrometer. 2. The small-sized spherical fruit sugar-acid ratio rapid nondestructive testing device with weighing function according to claim 1, characterized in that: the lens fiber optic connector is funnel-shaped with a large head and a small tail, and the inner wall of the head is made There are internal threads for matching two inner sleeves (3-6); the inner wall of the tail is made with internal threads for fixing the outgoing optical fiber; the outer surface of the tail is also made with three circumferentially uniform convex light holes (3-7- 1), each convex light hole is matched with a long screw (3-8) protruding radially from the ring beam splitter. 3. The small spherical fruit-sugar-acid ratio rapid non-destructive testing device with weighing function according to claim 2, the focusing lens is positioned on the upper part of the lens fiber optic connector by an inner sleeve with adjustable spacing. 4. The small spherical fruit sugar-acid ratio rapid nondestructive testing device with weighing function according to claim 3, said light source is a halogen light source with adjustable power.

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