Portable fruit sugar nondestructive detector

Abstract

The invention relates to the technical field of fruit quality detection, in particular to a portable fruit sugar nondestructive detector which comprises a second shell cover, a first shell cover is detachably connected to the upper portion of the second shell cover through a fastener, a light guide ring is fixedly embedded in an inner cavity of the first shell cover, a transmitting panel is fixedly embedded in an inner cavity of the first shell cover, and a light guide plate is fixedly embedded in an inner cavity of the transmitting panel. The emitting panel is located below the light guide ring, a main body is fixedly embedded in an inner cavity of the first shell cover, a light guide column base is fixedly embedded in the middle of the main body, a light splitting piece is fixedly embedded in the top end of the light guide column base, and a light shielding plate is fixedly connected to the bottom end of the light guide column base through a fastener; and an optical filter is fixedly embedded in the middle of the shading plate, a transmitting panel is arranged in the middle of the bottom end of the second shell cover, and a receiving panel is arranged at the bottom end of the second shell cover. According to the portable fruit sugar nondestructive testing device, the problems that a detector needs to use a special light source and a spectrograph, the price is high, and the portable fruit sugar nondestructive testing device is inconvenient to carry are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fruit quality detection, in particular to a portable fruit sugar non-destructive detector. Background Art

[0002] Fruit quality testing products are mainly focused on the detection of fruit sugar. Existing sugar testing instruments are mainly divided into two categories, one is the refractometer, and the other is the near-infrared spectroscopy non-destructive testing. The refractometer uses the principle that the different sugar concentrations in the fruit juice have different refractive indices for light to perform testing. It is necessary to destroy the fruit and take the juice from the fruit pulp. It is an invasive test, which brings trouble to fruit wholesalers and consumers. For the current near-infrared spectroscopy non-destructive testing, it is basically based on scanning the fruit with a spectrometer, and using the absorption peak of the fruit sugar in the near-infrared band to calculate the sugar content of the fruit according to the Lambert-Beer law. This type of detector requires the use of a dedicated light source and spectrometer, which is expensive and not easy to carry, and belongs to laboratory testing. At present, a portable fruit sugar non-destructive tester that truly uses the near-infrared spectroscopy detection principle has not yet been launched on the market. To address this problem, a portable fruit sugar non-destructive tester is provided. Summary of the invention

[0003] The purpose of the present invention is to provide a portable fruit sugar non-destructive detector to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a portable fruit sugar non-destructive detector, comprising a second shell cover, the upper part of the second shell cover is detachably connected to the first shell cover through a fastener, the inner cavity of the first shell cover is fixedly embedded with a light guide ring, the inner cavity of the first shell cover is fixedly embedded with an emission panel, the emission panel is located below the light guide ring, the inner cavity of the first shell cover is fixedly embedded with a main body, the middle part of the main body is fixedly embedded with a light guide column seat, the top of the light guide column seat is fixedly embedded with a beam splitter, the bottom end of the light guide column seat is fixedly connected with a light shielding plate through a fastener, the middle part of the light shielding plate is fixedly embedded with a filter, the middle part of the bottom end of the second shell cover is provided with an emission panel, the bottom end of the second shell cover is provided with a receiving panel, and the receiving panel surrounds the emission panel.

[0004] Preferably, twenty-one lighting lamps are provided on the transmitting panel.

[0005] Preferably, the lighting lamps have seven wavelengths, with three lamps for each wavelength.

[0006] Preferably, the twenty-one lighting lamps are arranged at 120°.

[0007] Preferably, the height of the first shell cover and the second shell cover after installation is 76 mm.

[0008] Preferably, the first shell cover has an outer diameter of 69 mm.

[0009] Preferably, the light-guiding column base is in a tower shape.

[0010] Preferably, the light guide ring is an acrylic light guide ring.

[0011] Preferably, the transmitting panel is a PCB board.

[0012] Preferably, the lighting lamp is an LED lamp.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 7 groups of modulated LED light sources emit different wavelengths in turn and shine on the fruit. The light diffusely reflected from the inside of the apple shines on 7 detectors to obtain signals. The signals are amplified and sampled into the control chip. The control chip transmits the collected signal data to the mobile phone app through the Bluetooth module. The mobile phone app then transmits the data to the server. The server uses a verified mathematical model to calculate the sugar content of the fruit, and then the server sends the result back to the mobile phone for display. The overall dimensions of the entire product are 76mm in height and 69mm in maximum outer diameter, which is very easy to carry. The product uses a combination of 7 wavelengths of infrared LED light sources, which greatly reduces the cost. The correlation coefficient R2 value between the predicted values ​​of 164 apples and the values ​​measured by the refractometer reaches 0.856. The root mean square error (RMSE) is 0.52brix, which fully meets the detection needs and solves the problem that the detector needs to use a dedicated light source and spectrometer, which is expensive and not easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front cross-sectional view of the portable fruit sugar nondestructive detector of the present invention;

[0016] Figure 2 This is a front view of the portable fruit sugar nondestructive detector of the present invention;

[0017] Figure 3 A top view of the portable fruit sugar nondestructive detector of the present invention;

[0018] Figure 4 This is a curve diagram of the modeling of the apple sugar content of the portable fruit sugar non-destructive detector of the present invention;

[0019] Figure 5 This is a spectrum diagram of the portable fruit sugar non-destructive detector of the present invention;

[0020] Figure 6 This is a comparison diagram of the portable fruit sugar non-destructive tester for apples measured by the present invention and the refractometer;

[0021] Figure 7This is a technical principle block diagram of the portable fruit sugar nondestructive detector of the present invention.

[0022] In the figure: 1. first shell cover, 2. emission panel, 3. light guide ring, 4. beam splitter, 5. light guide column base, 6. main body, 7. filter, 8. light shielding plate, 10. second shell cover. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figures 1 to 5 The present invention provides a technical solution: a portable fruit sugar non-destructive tester, comprising a second shell cover 10, the upper part of the second shell cover 10 is detachably connected to the first shell cover 1 through a fastener, the inner cavity of the first shell cover is fixedly embedded with a light guide ring 3, the function of the light guide ring 3 is to guide the light emitted by the LED on the emission panel 2 into the fruit to be tested according to a certain angle, mainly playing the role of changing the direction of the light and converging the light, the inner cavity of the first shell cover 1 is fixedly embedded with the emission panel 2, the emission panel 2 is located below the light guide ring 3, the inner cavity of the first shell cover 1 is fixedly embedded with a main body 6, and the middle part of the main body 6 is fixedly embedded with a guide ring 3. A light column seat 5, the top of the light guide column seat 5 is fixedly embedded with a beam splitter 4, the function of the beam splitter 4 is to evenly disperse the light scattered from the apple, so that the 7 detectors at the receiving end can receive the signal, the bottom end of the light guide column seat 5 is fixedly connected with a shading plate 8 through a fastener, the middle part of the shading plate 8 is fixedly embedded with a filter 7, the function of the filter 7 is to filter out the light scattered from the fruit according to the wavelength, the filter 7 is closely attached to the photodetector, the middle part of the bottom end of the second shell cover 10 is provided with an emitting panel 2, the bottom end of the second shell cover 10 is provided with a receiving panel, and the receiving panel surrounds the emitting panel 2.

[0025] In this embodiment, twenty-one lighting lamps are arranged on the emitting panel 2 .

[0026] In this embodiment, the illumination lamps have seven wavelengths, with three lamps for each wavelength.

[0027] In this embodiment, twenty-one lighting lamps are arranged at 120°.

[0028] In this embodiment, the height of the first shell cover 1 and the second shell cover 10 after installation is 76 mm.

[0029] In this embodiment, the outer diameter of the first housing cover 1 is 69 mm.

[0030] In this embodiment, the light guide column seat 5 is in the shape of a tower. The tower-shaped light guide column is used to guide the sampled light dispersed by the beam splitter 4 to the photodetector, and is used to transmit light from one light source to another point at a certain distance from the light source with minimal loss. The working principle of the light guide column is based on the law of total reflection and refraction. When light is emitted from a light-dense medium (such as a light guide column material) to a light-sparse medium (such as air), if the incident angle is greater than the critical angle, the light will be completely reflected back to the light-dense medium, thereby realizing the transmission and control of light. In addition, by controlling the structure and material of the light guide column, the refraction and transmission of light can also be realized to meet different application requirements. The light guide column is usually made of optical materials, such as acrylic resin (acrylic), polycarbonate, epoxy resin and glass. These materials have high light transmittance, good chemical stability and mechanical strength, and can meet the needs of different application scenarios. The light guide column can be made into various shapes, such as cylindrical, square, conical or special shapes (such as arrows, stars, half-moon shapes, etc.). Its structure usually includes an entrance end, a transmission section and an exit end. The entrance end needs to be closely matched with the light source (such as LED) to ensure that the light can enter the light guide efficiently; the transmission section needs to be kept smooth and free of impurities to ensure that the light will not be scattered or lost during transmission. The exit end can be designed as needed to achieve a specific lighting effect.

[0031] In this embodiment, the light guide ring 3 is an acrylic light guide ring 3. Acrylic has high transparency, and its transparency and light transmittance are like glass. The objects inside it can be clearly seen. Acrylic has excellent chemical stability and can resist the erosion of most acids, alkalis and organic solvents. Acrylic has high mechanical strength and hardness, can withstand certain pressure and impact, and is suitable for making various high-precision products such as mechanical parts and optical instruments. Acrylic is easy to process into products of various shapes and sizes, and can be processed by injection molding, extrusion, cutting and other processes. The surface after processing is smooth and easy to color and polish.

[0032] In this embodiment, the transmitting panel 2 is a PCB board.

[0033] In this embodiment, the lighting lamp is an LED lamp. The photoelectric conversion efficiency of the LED lamp is high, and most of the electrical energy can be converted into light energy. In contrast, most of the electrical energy of traditional bulbs such as incandescent bulbs is converted into heat energy and dissipated. The LED lamp does not contain harmful substances such as mercury, and therefore has less impact on the environment during production, use and disposal. The LED lamp adopts solid-state packaging technology and is less likely to break than traditional bulbs. The lighting time of the LED lamp is very short and can reach the maximum brightness almost instantly. The LED lamp technology supports good dimming function, and users can adjust the light brightness as needed. The LED lamp is small in size, light in weight, and easy to install.

[0034] The use method and advantages of the present invention: When in use, the working process is as follows:

[0035] 7 groups of modulated LED lights take turns to emit different wavelengths and shine on the fruit. The light diffusely reflected from the inside of the apple shines on 7 detectors to obtain signals. The signals are amplified and sampled into the control chip. The control chip transmits the collected signal data to the mobile phone app through the Bluetooth module. The mobile phone app then transmits the data to the server. The verified mathematical model in the server is used for calculation to calculate the sugar content of the fruit. The server then sends the result back to the mobile phone for display. The overall dimensions of the entire product are 76mm in height and 69mm in maximum outer diameter, which is very easy to carry. The product uses a combination of 7 wavelengths of infrared LED light sources, which greatly reduces the cost. The correlation coefficient R2 value between the predicted values ​​of 164 apples and the values ​​measured by the refractometer reaches 0.856. The root mean square error (RMSE) is 0.52brix, which fully meets the detection requirements and solves the problem that the detector needs to use a dedicated light source and spectrometer, which is expensive and not easy to carry. The detector is non-destructive and does not need to destroy the fruit for detection. Secondly, the detector based on LED light emitting diodes can be very small, easy to carry, and low in cost. Figure 5 As shown in the figure, the correlation coefficient R2 value between the predicted value of apples measured by the detector and the detection value of the light-shading meter reached 85.6%. The calculated root mean square error was 0.52, which can fully meet the requirements of fruit sugar detection and fruit quality grading.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A portable fruit sugar non-destructive testing instrument, comprising a second housing cover (10), characterized in that: The upper part of the second shell cover (10) is detachably connected to the first shell cover (1) via fasteners; a light guide ring (3) is fixedly embedded in the inner cavity of the shell cover; an emission panel (2) is fixedly embedded in the inner cavity of the first shell cover (1); the emission panel (2) is located below the light guide ring (3); a main body (6) is fixedly embedded in the inner cavity of the first shell cover (1); a light guide column seat (5) is fixedly embedded in the middle of the main body (6); a beam splitter (4) is fixedly embedded in the top of the light guide column seat (5); a light shielding plate (8) is fixedly connected to the bottom of the light guide column seat (5) via fasteners; a filter (7) is fixedly embedded in the middle of the light shielding plate (8); an emission panel (2) is arranged in the middle of the bottom end of the second shell cover (10); a receiving panel is arranged at the bottom end of the second shell cover (10); the receiving panel surrounds the emission panel (2).

2. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: Twenty-one lighting lamps are arranged on the emission panel (2).

3. The portable fruit sugar nondestructive detector according to claim 2, characterized in that: The lighting lamps have seven wavelengths, with three lamps for each wavelength.

4. The portable fruit sugar nondestructive detector according to claim 2, characterized in that: The twenty-one lighting lamps are arranged at 120°.

5. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: The height of the first shell cover (1) and the second shell cover (10) after installation is 76 mm.

6. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: The first shell cover (1) has an outer diameter of 69 mm.

7. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: The light-guiding column seat (5) is in a tower shape.

8. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: The light guide ring (3) is an acrylic light guide ring (3).

9. The portable fruit sugar nondestructive detector according to claim 1, characterized in that: The transmitting panel (2) is a PCB board.

10. The portable fruit sugar non-destructive detector according to claim 2, characterized in that: The lighting lamp is an LED lamp.

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