Portable fruit sugar nondestructive detector

Abstract

The utility model 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, an emitting panel is fixedly embedded in an inner cavity of the first shell cover, and the emitting panel is fixedly embedded in an inner cavity of the second shell cover. 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 utility model relates to the technical field of fruit quality detection, in particular to a portable non-destructive fruit sugar detector. Background Technique

[0002] Fruit quality detection products mainly focus on the detection of fruit sugar. Existing sugar detection instruments are mainly divided into two categories. One is a refractometer, and the other is non-destructive near-infrared spectroscopy detection. The refractometer uses the principle that different concentrations of fruit juice sugar have different refractive indices for light to conduct detection. It is necessary to damage the fruit and take the fruit juice in the fruit pulp, which belongs to invasive detection. This brings trouble to the purchase and detection of fruit wholesalers and consumers. For the current non-destructive near-infrared spectroscopy detection, basically, the fruit is scanned by a spectrometer, and the sugar content of the fruit is calculated according to the absorption peak of the fruit sugar in the near-infrared band based on 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, belonging to laboratory detection. At present, there is no truly portable non-destructive fruit sugar detector using the near-infrared spectroscopy detection principle on the market. To solve this problem, a portable non-destructive fruit sugar detector is provided. Content of the Utility Model

[0003] The purpose of the utility model is to provide a portable non-destructive fruit sugar detector to solve the problems raised in the above background technique. To achieve the above purpose, the utility model provides the following technical solution: A portable non-destructive fruit sugar detector includes a second shell cover. The upper part of the second shell cover is detachably connected with a first shell cover through a fastener. A light guide ring is fixedly embedded in the inner cavity of the first shell cover. An emission panel is fixedly embedded in the inner cavity of the first shell cover. The emission panel is located below the light guide ring. A main body is fixedly embedded in the inner cavity of the first shell cover. A light guide column seat is fixedly embedded in the middle of the main body. A spectroscope is fixedly embedded at the top of the light guide column seat. The bottom end of the light guide column seat is fixedly connected with a light-shielding plate through a fastener. A filter is fixedly embedded in the middle of the light-shielding plate. An emission panel is arranged in the middle of the bottom end of the second shell cover. A receiving panel is arranged at the bottom end of the second shell cover. The receiving panel surrounds the emission panel.

[0004] Preferably, there are twenty-one lighting lamps on the emission panel.

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

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

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

[0008] Preferably, the diameter of the first shell cover is 69 mm in outer diameter.

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

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

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

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

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] Seven groups of modulated LED emission light sources alternately emit different wavelengths and irradiate on fruits. The light diffusely reflected from the inside of the apples irradiates on seven detectors to obtain signals. The signals are amplified and sampled and then enter 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 data is calculated by a calibrated mathematical model in the server to calculate the sugar content of the fruits. Then the server transmits the result back to the mobile phone for display. The overall dimensions of the whole product are 76 mm in height and 69 mm in maximum outer diameter, which is very convenient to carry. The product adopts a combination of seven-wavelength infrared LED light sources, which greatly reduces the cost. The correlation coefficient R2 value between the predicted values of 164 apples and the measured values by the refractometer reaches 0.856, and the root mean square error (RMSE) is 0.52 brix, which fully meets the detection requirements and solves the problems that the detector needs to use a dedicated light source and spectrometer, with high prices and inconvenience in carrying. Description of the Drawings

[0015] Figure 1 is the front sectional view of the portable fruit sugar content non-destructive detector of the present utility model;

[0016] Figure 2 is the front view of the portable fruit sugar content non-destructive detector of the present utility model;

[0017] Figure 3 is the top view of the portable fruit sugar content non-destructive detector of the present utility model;

[0018] Figure 4 is the apple sugar content modeling curve graph of the portable fruit sugar content non-destructive detector of the present utility model;

[0019] Figure 5 is the spectrogram of the portable fruit sugar content non-destructive detector of the present utility model;

[0020] Figure 6 is the comparison graph between the actual measurement of the apple by the portable fruit sugar content non-destructive detector of the present utility model and the refractometer;

[0021] Figure 7 This is the technical principle block diagram of the portable fruit sugar non-destructive detector of the present utility model.

[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 shield, 10. Second shell cover. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0024] Please refer to Figures 1 to 5 , the present utility model provides a technical solution: a portable fruit sugar non-destructive detector, including a second shell cover 10. The upper part of the second shell cover 10 is detachably connected to a first shell cover 1 through a fastener. A light guide ring 3 is fixedly embedded in the inner cavity of the first shell cover 1. 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 measured at a certain angle, mainly playing the role of changing the direction of the light and converging the light. 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 base 5 is fixedly embedded in the middle of the main body 6. A beam splitter 4 is fixedly embedded at the top of the light guide column base 5. The function of the beam splitter 4 is to evenly disperse the light scattered from the apple, so that the seven detectors at the receiving end can receive signals. The bottom end of the light guide column base 5 is fixedly connected to a light shield 8 through a fastener. A filter 7 is fixedly embedded in the middle of the light shield 8. The function of the filter 7 is to filter the light scattered from the fruit according to the wavelength. The filter 7 is closely attached to the photodetector. An emission panel 2 is provided in the middle of the bottom end of the second shell cover 10. A receiving panel is provided at the bottom end of the second shell cover 10. The receiving panel surrounds the emission panel 2.

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

[0026] In this embodiment, the lighting lamps have seven wavelengths, and there are three lamps for each wavelength.

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

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

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

[0030] In this embodiment, the light guide column base 5 is in a tower shape. The function of the tower-shaped light guide column is to guide the sampled light dispersed by the beam splitter 4 onto the photodetector, which 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 laws of total reflection and refraction. When light rays travel from an optically denser medium (such as the light guide column material) to an optically less dense medium (such as air), if the incident angle is greater than the critical angle, the light rays will be completely reflected back into the optically denser medium, thus achieving 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 achieved 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 requirements of different application scenarios. The light guide column can be made into various shapes, such as cylindrical, square, conical, or special shapes (such as arrow, star, half-moon, etc.). Its structure usually includes an inlet end, a transmission section, and an outlet end. The inlet end needs to be closely matched with the light source (such as an LED) to ensure that light can efficiently enter the interior of the light guide column; the transmission section needs to be smooth and free of impurities inside to ensure that light does not scatter or lose during transmission, and the outlet end can be designed according to needs 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 that of glass, and the objects inside can be clearly seen. Acrylic has excellent chemical stability and can resist the erosion of most acids, alkalis, and organic solvents. Acrylic has relatively high mechanical strength and hardness and can withstand a certain amount of pressure and impact, which is suitable for making various high-precision products such as mechanical parts and optical instruments. Acrylic is easy to be processed into products of various shapes and sizes and can be processed by processes such as injection molding, extrusion, and cutting. After processing, the surface is smooth and easy to color and polish.

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

[0033] In this embodiment, the lighting lamp is an LED lamp. The LED lamp has a high photoelectric conversion efficiency and can convert most of the electrical energy into light energy, while most of the electrical energy of traditional bulbs such as incandescent lamps is dissipated as heat. The LED lamp does not contain harmful substances such as mercury, so it has less impact on the environment during production, use, and disposal. The LED lamp adopts solid-state encapsulation technology and is less likely to break compared with traditional bulbs. The LED lamp has a very short lighting time and can almost instantly reach the maximum brightness. The LED lamp technology supports a good dimming function, and users can adjust the light brightness according to needs. The LED lamp is small in size and light in weight, which is convenient for installation.

[0034] Usage method and advantages of the present utility model: When in use, the working process is as follows:

[0035] Seven groups of modulated LED lights emit different wavelengths in turn and irradiate the fruits. The light diffusely reflected from the inside of the apples shines on seven detectors to obtain signals. The signals are amplified and sampled and then enter 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 data is calculated by a calibrated mathematical model in the server to calculate the sugar content of the fruits. Then the server transmits the result back to the mobile phone for display. The overall dimensions of the product are 76 mm in height and 69 mm in maximum outer diameter, which is very convenient to carry. The product uses a combination of infrared LED light sources with seven wavelengths, greatly reducing the cost. The correlation coefficient R2 value between the predicted values of 164 apples and the values measured by the refractometer reaches 0.856, and the root mean square error (RMSE) is 0.52 brix, fully meeting the detection requirements, solving the problems that the detector needs to use a dedicated light source and spectrometer, which are expensive and not convenient to carry. The detector is non-destructive and does not require damaging the fruits for detection. Secondly, the detector based on LED light-emitting diodes can be made very small, convenient to carry, and at the same time, the cost is low. As shown in Figure 5 the figure, the correlation coefficient R2 value between the predicted values of the apples measured by this detector and the detection values of the refractometer reaches 85.6%. The calculated root mean square error is 0.52, which can fully meet the detection of the sugar content of the fruits and the grading requirements of the fruit quality.

[0036] The above shows and describes the basic principles, main features and advantages of the present utility model. Technical staff in this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended 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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