A fruit internal quality detection device and a detection method thereof

Abstract

The application discloses a fruit internal quality detection device and a detection method thereof, and relates to the technical field of fruit detection.The device comprises light source reflection box bodies and optical fiber receiving box bodies which are installed on both sides of a detection dark box.Light emitted by a light source at the light source reflection box body passes through a light source sleeve, a first convex lens, a first reflector and a second convex lens, and is then injected into the detection dark box.The light emitted from the detection dark box passes through a third convex lens, a second reflector, a fourth convex lens and a telescopic optical fiber sleeve at the optical fiber receiving box body, and then reaches an optical fiber probe.The four convex lenses are arranged to relay and focus the light, so that the light is condensed and not diffused during transmission, and the precision of detecting the internal quality of the fruit by using near-infrared full transmission spectrum technology is improved.The arrangement of the convex lenses and the reflectors is optimized, so that the space is fully utilized, the overall size of the equipment is reduced, and the flexibility and application range of the equipment are improved.

Description

Technical Field

[0001] This invention relates to the field of fruit testing technology, specifically to a fruit internal quality testing device and its testing method. Background Technology

[0002] As people's living standards improve, fruit has become a daily food for many households. Fruits are rich in vitamins, minerals, and other substances, and eating more fruit can improve the body's immunity. With social development and the pursuit of a better life, people's requirements for fruit quality are also increasing. Traditional methods for detecting the internal quality of fruit, such as sugar content, acidity, and vitamin content, often use chemical methods or manual methods. Traditional chemical testing methods can damage the fruit, rendering it inedible, and are inefficient and costly. Manual testing methods lack scientific rigor, are highly subjective, and have low sorting yields, failing to meet commercial demands. Near-infrared spectroscopy is a green, non-destructive, pollution-free, and rapid detection technology commonly used for detecting the internal quality of fruit. Currently, near-infrared spectroscopy commonly uses diffuse reflectance detection in fruit internal quality detection. This method has significant stray light, requiring complex algorithms for spectral processing, and can only obtain information from the fruit's surface, resulting in poor accuracy in detecting internal lesions.

[0003] In the prior art, a near-infrared transmission spectroscopy online detection system and method for the internal quality of fruit, with publication number "CN104251837B", provides a technical solution for detecting the internal quality of fruit using near-infrared transmission spectroscopy. The detection system includes: a conveyor unit, a light source kit, a spectral acquisition unit, a photoelectric switch, a frame, and a computer. The conveyor unit includes a conveyor belt and trays for conveying fruit. The trays are evenly spaced on the conveyor belt for placing fruit. The light source kit includes a light source and a lens, with the center of the light source and the center of the lens on the same normal. The light source kit is symmetrically arranged on both sides of the conveyor unit and fixed to the frame to provide illumination. The spectral acquisition unit includes a fiber optic spectrometer and a fiber optic probe. The first end of the fiber optic probe is connected to the fiber optic spectrometer, and the second end is installed below the conveyor belt. The plane formed by the second end and the light source kit is perpendicular to the straight line of the conveyor belt. The fiber optic spectrometer is connected to the computer, and the spectral acquisition unit is placed in a closed dark box, which is a significant improvement over the detection method using diffuse reflection.

[0004] However, existing technologies still have significant drawbacks. For example, the light emitted by the light source diffuses during transmission. Excessive light diffusion can affect the light's ability to penetrate the fruit's interior, negatively impacting the detection of the fruit's internal quality using near-infrared transmission spectroscopy. Similarly, diffused light can introduce irrelevant interference factors, increasing the workload and difficulty of subsequent processing of light information. Summary of the Invention

[0005] The purpose of this invention is to provide a fruit internal quality testing device and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fruit internal quality testing device, comprising:

[0008] A detection dark box is installed above the transmission device;

[0009] A light source reflecting box is installed on one side of the detection dark box. A second convex lens and a first convex lens are respectively installed on the side wall of the light source reflecting box near the detection dark box and on the side wall adjacent to the second convex lens. A first reflector is slidably installed inside the light source reflecting box in a direction away from the second convex lens. The first convex lens is slidably set on the side wall of the light source reflecting box in a direction away from the second convex lens. The first convex lens is connected to a light source sleeve that extends out of the light source reflecting box. A light source is installed at the end of the light source sleeve away from the first convex lens. The light emitted by the light source passes through the light source sleeve, the first convex lens, the first reflector, and the second convex lens before entering the detection dark box.

[0010] An optical fiber receiving box is installed on the other side of the detection dark box. A third convex lens and a fourth convex lens are respectively installed on the side wall of the optical fiber receiving box near the detection dark box and on the side wall adjacent to the third convex lens. A second reflector is slidably installed inside the optical fiber receiving box in a direction away from the third convex lens. The fourth convex lens is slidably set on the side wall of the optical fiber receiving box in a direction away from the third convex lens. The fourth convex lens is connected to a telescopic optical fiber sleeve that extends out of the optical fiber receiving box. An optical fiber probe is installed at the end of the telescopic optical fiber sleeve away from the fourth convex lens. The light emitted from the detection dark box passes through the third convex lens, the second reflector, the fourth convex lens, and the telescopic optical fiber sleeve before reaching the optical fiber probe.

[0011] Preferably, the first reflector is detachably mounted on the first reflector bracket, and the first reflector bracket is detachably connected to the first reflector base. The first reflector base slides against the bottom wall of the light source reflecting box, and the first reflector base has a first groove extending away from the direction of the second convex lens. The bottom wall of the light source reflecting box has a first insertion hole located in the first groove, and a first bolt with its end pressed on the first reflector base is screwed into the first insertion hole for fixation.

[0012] Preferably, the first convex lens is detachably mounted on the first convex lens bracket, and the side wall of the light source reflection box is provided with a sliding groove for the first convex lens bracket to slide.

[0013] Preferably, the first convex lens bracket, the light source sleeve, and the light source are all fixedly mounted with connecting wing plates, and at least one adjusting bolt is screwed into the threaded hole of the connecting wing plate on the first convex lens bracket and the light source sleeve, and at least one adjusting bolt is screwed into the threaded hole of the connecting wing plate on the light source sleeve and the light source.

[0014] Preferably, the second reflector is detachably mounted on the second reflector bracket, and the second reflector bracket is detachably connected to the second reflector base. The second reflector base slides against the bottom wall of the optical fiber receiving box, and the second reflector base has a second groove extending away from the direction of the third convex lens. The optical fiber receiving box has a second insertion hole located in the second groove, and a second bolt with its end pressed on the second reflector base is screwed into the second insertion hole for fixation.

[0015] Preferably, the fourth convex lens is detachably mounted on the fourth convex lens bracket, and the side wall of the optical fiber receiving box is provided with a sliding groove for the fourth convex lens bracket to slide.

[0016] Preferably, the telescopic fiber optic sleeve includes a threaded outer sleeve and an inner adjusting sleeve, with the ends of the outer sleeve and the inner adjusting sleeve that are far apart from each other respectively mounted on the fourth convex lens bracket and the fiber optic probe.

[0017] Preferably, both ends of the detection dark box are equipped with light-shielding silicone plates, and the inlet end of the detection dark box is equipped with two guide plates that are close to each other.

[0018] Preferably, the detection dark box has several fastening bolts extending through it, with the two ends of the fastening bolts extending out of the light source reflection box and the optical fiber receiving box, respectively, and fastening nuts screwed into both ends of the fastening bolts.

[0019] A detection method for the aforementioned fruit internal quality detection device includes the following steps:

[0020] A. Adjust the installation position and angle of the first reflecting mirror and the first convex lens so that the light emitted from the first convex lens is reflected by the first reflecting mirror and enters the second convex lens, and make the sum of the distances from the first reflecting mirror to the first convex lens and to the second convex lens equal to the focal length of the first convex lens.

[0021] B. Adjust the installation position and angle of the second reflecting mirror and the fourth convex lens so that the light emitted from the third convex lens is reflected by the second reflecting mirror and enters the fourth convex lens, and the sum of the distances from the second reflecting mirror to the third convex lens and to the fourth convex lens is equal to the focal length of the third convex lens.

[0022] C. Adjust the length of the telescopic fiber optic sleeve so that the distance from the fourth convex lens to the fiber optic probe is equal to the focal length of the fourth convex lens.

[0023] D. Start the transmission device and light source. The fruit enters the detection dark box for detection. The light emitted by the light source enters the detection dark box after passing through the first convex lens, the first reflector and the second convex lens. The light entering the detection dark box penetrates the fruit and leaves the detection dark box. The light leaving the detection dark box passes through the third convex lens, the second reflector, the fourth convex lens and the telescopic fiber optic sleeve and is transmitted to the fiber optic probe.

[0024] E. The optical signal received by the fiber optic probe is analyzed and processed to detect the internal quality of the fruit.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The fruit internal quality detection device and method of the present invention, by setting four convex lenses to focus light in relay, ensures that the light is concentrated and does not diffuse during transmission, thereby improving the accuracy of detecting the internal quality of fruit using near-infrared full transmission spectroscopy technology. Furthermore, by arranging adjacent convex lenses at right angles and sliding a reflector between them, the device makes full use of space and reduces the overall size of the equipment. At the same time, it allows for the replacement of convex lenses with different focal lengths according to different needs, greatly improving the flexibility and application range of the equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a top view of the overall structure of the present invention;

[0029] Figure 3 This is a three-dimensional schematic diagram of the light source reflecting box at one angle in this invention;

[0030] Figure 4 This is a three-dimensional schematic diagram of the light source reflection box from another angle in this invention;

[0031] Figure 5 This is a three-dimensional schematic diagram of the optical fiber receiving box in this invention.

[0032] In the diagram: 1. Detection dark box, 11. Light-shielding silicone plate, 12. Guide plate, 2. Transmission device, 3. Light source reflection box, 31. First reflector, 32. First convex lens, 33. Second convex lens, 34. Light source sleeve, 35. Light source, 36. First reflector bracket, 37. First reflector base, 38. First convex lens bracket, 39. Adjusting bolt, 4. Fiber optic receiver box, 41. Second reflector, 42. Third convex lens, 43. Fourth convex lens, 44. Outer sleeve, 45. Inner adjusting cylinder, 46. Second reflector bracket, 47. Second reflector base, 48. Fourth convex lens bracket. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-5 The present invention provides a technical solution:

[0035] A fruit internal quality testing device includes a testing dark box 1, a light source reflecting box 3, and an optical fiber receiving box 4. The optical fiber receiving box 4 and the light source reflecting box 3 are distributed and installed on the left and right sides of the testing dark box 1. Specifically, several fastening bolts extend through the left and right sides of the testing dark box 1, and the two ends of the fastening bolts extend out of the light source reflecting box 3 and the optical fiber receiving box 4, respectively. Fastening nuts are screwed into both ends of the fastening bolts, so that the light source reflecting box 3 and the optical fiber receiving box 4 are installed on the testing box 1.

[0036] The detection dark box 1 is installed above the transmission device 2. The transmission device 2 can be a conveyor belt or other transmission structure; no restrictions are placed here. The transmission device 2 transports fruit from front to back. During this transport, the fruit passes through the detection dark box 1. The detection dark box 1 detects the fruit as it passes inside. Both the inlet and outlet ends (front and back ends) of the detection dark box 1 are equipped with light-blocking silicone plates 11. The flexible design of the light-blocking silicone plates 11 ensures the normal entry and exit of the fruit from the detection dark box 1 while blocking external light from entering, thus preventing interference from external light on the near-infrared full transmission spectroscopy detection of the fruit's internal quality. Two guide plates 12 are installed at the inlet end (i.e., the front end). The guide plates 12 limit the transportation path of the fruit, making it easier for the fruit to enter the detection dark box 1 and preventing the fruit from falling off the transmission device 2. The detection dark box 1 has a first grating aligned with the second convex lens 33 installed on the side wall near the light source reflection box 3. The first grating can effectively reduce the scattering angle of the incident light, prevent stray light interference, and ensure the accuracy of fruit quality detection. The detection dark box 1 has a second grating aligned with the third convex lens 42 installed on the side wall near the fiber optic receiving box 4, so that the light passing through the fruit is processed by the second grating before entering the third convex lens 42.

[0037] A light source reflecting box 3 is installed on the right side of the detection dark box 1. A second convex lens 33 and a first convex lens 32 are respectively installed on the side wall of the light source reflecting box 3 closest to the detection dark box 1 and on the side wall adjacent to it. A first reflecting mirror 31 is slidably installed inside the light source reflecting box 3 along the direction away from the second convex lens 33. The first reflecting mirror 31 is slidably positioned to accommodate the first convex lens 32 with different focal lengths, so that the light emitted from the first convex lens 32 is focused onto the second convex lens 33. The first convex lens 32 is slidably disposed on the side wall of the light source reflecting box 3 in a direction away from the second convex lens 33. The sliding arrangement of the first convex lens 32 facilitates the adjustment of the position of the light illuminating the first reflector 31, so that the light reflected by the first reflector 31 enters the second convex lens 33. The first convex lens 32 is connected to a light source sleeve 34 that extends out of the light source reflecting box 3. The inner surface of the light source sleeve 34 is treated with a glossy finish to reduce light loss. A light source 35 is installed at the end of the light source sleeve 34 away from the first convex lens 32. The light source 35 can be a halogen lamp.

[0038] The light emitted from light source 35 first passes through light source sleeve 34 to reach the first convex lens 32. The first convex lens 32 focuses the light once. By adjusting the distance between the first reflecting mirror 31 and the second convex lens 33, the sum of the distance the light travels from the first convex lens 32 to the first reflecting mirror 31 and the distance the light travels from the first reflecting mirror 31 to the second convex lens 33 equals the focal length of the first convex lens 32. This allows the light transmitted through the first convex lens 32 to be focused at the second convex lens 33. Focusing the light through the first convex lens 32 avoids light diffusion and the introduction of interference factors during transmission. Furthermore, the focused light is directed into the second convex lens 33, and then refocused by the second convex lens 33 before being directed into the detection dark box 1, ensuring the intensity of the light entering the detection dark box 1, thereby ensuring the ability of the light to penetrate the inside of the fruit for quality inspection. In addition, the first convex lens 32 and the second convex lens 33 are distributed at right angles, and the first reflector 31 is slidably installed between them. This arrangement makes full use of space and reduces the overall size of the equipment. At the same time, it allows for the replacement of convex lenses with different focal lengths according to different needs (simply by adjusting the position of the first reflector 31 accordingly), greatly improving the flexibility and application range of the equipment.

[0039] In one specific implementation, the first reflector 31 is detachably mounted on the first reflector bracket 36. Specifically, the first reflector bracket 36 has threaded through holes on its upper, lower, left, and right side plates. The first reflector 31 is fixed to the first reflector bracket 36 by set screws. The lower end of the first reflector bracket 36 and the first reflector base 37 are detachably connected by hexagonal bolts. The first reflector base 37 slides against the bottom wall of the light source reflecting box 3. The first reflector 31 located on the first reflector bracket 36 is moved by moving the first reflector base 37. The first reflector base 37 has a first sliding groove extending away from the second convex lens 33. The bottom wall of the light source reflecting box 3 has a first insertion hole located in the first sliding groove. When adjusting the first reflector 31, the first insertion hole is always kept in the first sliding groove to avoid the problem of deflection and misalignment during the movement. After the first reflector 31 is adjusted, the first bolt is screwed into the first insertion hole and the end of the first bolt is pressed against the first reflector base 37 to keep the first reflector 31 fixed.

[0040] The first convex lens 32 is detachably mounted on the first convex lens bracket 38. The first convex lens bracket 38 and the light source sleeve 34 are both fixedly mounted with connecting wing plates, and at least one adjusting bolt 39 is screwed into the threaded hole of the connecting wing plate on the first convex lens bracket 38 and the light source sleeve 34. The side wall of the light source reflector box 3 is provided with a sliding groove for the adjusting bolt 39 to slide through. The sliding groove guides and limits the sliding process of the adjusting bolt 39, so that the first convex lens 32 can drive the light source sleeve 34 to slide together. The distance between the first convex lens 32 and the light source sleeve 34 can be adjusted by the length of the adjusting bolt 39 screwed in.

[0041] A connecting wing plate is also fixedly connected to the light source 35, and at least one adjusting bolt 39 is screwed into the threaded hole of the connecting wing plate on the light source sleeve 34 and the light source 35. The distance between the light source sleeve 34 and the light source 35 is adjusted by the length of the adjusting bolt 39 screwed in, so as to avoid the problem that the light source 35 is too close to the light source sleeve 34, which affects heat dissipation, or the light source 35 is too far from the light source sleeve 34, which leads to excessive light loss.

[0042] The fiber optic receiver box 4 is installed on the left side of the detection dark box 1. A third convex lens 42 and a fourth convex lens 43 are respectively installed on the side wall of the fiber optic receiver box 4 near the detection dark box 1 and on the side wall adjacent to the side wall. A second reflector 41 is slidably installed inside the fiber optic receiver box 4 in a direction away from the third convex lens 42. The second reflector 41 is slidably set to adapt to the third convex lens 42 with different focal lengths, so that the light emitted from the third convex lens 42 is focused on the fourth convex lens 43. The fourth convex lens 43 is slidably set on the side wall of the fiber optic receiver box 4 in a direction away from the third convex lens 42. The fourth convex lens 43 is slidably set to adjust its own position to receive the light reflected by the second reflector 41. The fourth convex lens 43 is connected to a telescopic fiber optic sleeve that extends out of the fiber optic receiver box 4. A fiber optic probe is installed at the end of the telescopic fiber optic sleeve away from the fourth convex lens 43. The inner surface of the telescopic fiber optic sleeve is treated with a glossy finish to reduce light loss.

[0043] The light leaving the detection dark box 1 first reaches the third convex lens 42, which focuses the light once. By adjusting the distance between the second reflecting mirror 41 and the third convex lens 42, the sum of the distance the light travels from the third convex lens 42 to the second reflecting mirror 41 and the distance the light travels from the second reflecting mirror 41 to the fourth convex lens 43 is equal to the focal length of the third convex lens 42. This allows the light transmitted through the third convex lens 42 to be focused at the fourth convex lens. Focusing the light through the third convex lens 42 avoids light diffusion and the introduction of interference factors during transmission. The light, after being focused by the third convex lens 42, enters the fourth convex lens 43 for secondary focusing. By adjusting the extension length of the telescopic sleeve, the light is further focused... The distance between the fourth convex lens 43 and the fiber optic probe is equal to the focal length of the fourth convex lens 43, so that the light after being focused twice by the fourth convex lens 43 enters the fiber optic probe. The color matching of the third convex lens 42 and the fourth convex lens 43 ensures that the light is focused and does not diffuse during transmission, which facilitates the subsequent analysis and processing of the light information collected by the fiber optic probe. Similarly, the third convex lens 42 and the fourth convex lens 43 are distributed at right angles, and the second reflector 41 is slidably installed between them. While making full use of space and reducing the overall size of the equipment, different focal length convex lenses can be replaced according to different needs (only the position of the second reflector 41 needs to be adjusted accordingly), which greatly improves the flexibility and application range of the equipment.

[0044] In one implementation, the second reflector 41 is detachably mounted on the second reflector bracket 46. Specifically, the second reflector bracket 46 has threaded through holes on its upper, lower, left, and right side plates. The second reflector 41 is fixed to the second reflector bracket 46 by set screws. The lower end of the second reflector bracket 46 is detachably connected to the second reflector base 47 by hexagonal bolts. The second reflector base 47 slides against the bottom wall of the fiber optic receiver box 4. The second reflector 41 located on the second reflector bracket 46 is moved by moving the second reflector base 47. The second reflector base 47 has a second sliding groove extending away from the third convex lens 42. The fiber optic receiver box 4 has a second insertion hole located in the second sliding groove. When adjusting the second reflector 41, the second insertion hole is kept in the second sliding groove to avoid deflection or misalignment during the movement. After the second reflector 41 is adjusted, the second bolt is screwed into the second insertion hole and the end of the second bolt is pressed against the second reflector base 47 to keep the second reflector 41 fixed.

[0045] The fourth convex lens 43 is detachably mounted on the fourth convex lens bracket 48. The telescopic fiber optic sleeve includes a threaded outer sleeve 44 and an inner adjusting sleeve 45. By screwing the inner adjusting sleeve 45 into or out of the outer sleeve 44, the distance between the fourth convex lens 43 and the fiber optic probe can be adjusted. The ends of the outer sleeve 44 and the inner adjusting sleeve 45 that are far apart from each other are respectively mounted on the fourth convex lens bracket 48 and the fiber optic probe. Specifically, the fourth convex lens bracket 48 has through holes around its perimeter. The fourth convex lens bracket 48 and the outer sleeve 44 of the telescopic fiber optic sleeve are fixedly connected by tightening bolts. The light receiving box 4 has a sliding groove for the tightening bolt to slide through. The sliding groove guides and limits the sliding process of the tightening bolt, so that the fourth convex lens 43 can drive the telescopic fiber optic sleeve to slide together.

[0046] A detection method for the aforementioned fruit internal quality detection device includes the following steps:

[0047] A. Adjust the installation position and angle of the first reflecting mirror 31 and the first convex lens 32 so that the light emitted from the first convex lens 32 is reflected by the first reflecting mirror 31 and enters the second convex lens 33, and the sum of the distances from the first reflecting mirror 31 to the first convex lens 32 and to the second convex lens 33 is equal to the focal length of the first convex lens 32.

[0048] B. Adjust the installation position and angle of the second reflecting mirror 41 and the fourth convex lens 43 so that the light emitted from the third convex lens 42 is reflected by the second reflecting mirror 41 and enters the fourth convex lens 43, and the sum of the distances from the second reflecting mirror to the third convex lens 42 and to the fourth convex lens 43 is equal to the focal length of the third convex lens 42.

[0049] C. Adjust the length of the telescopic fiber optic sleeve so that the distance from the fourth convex lens 43 to the fiber optic probe is equal to the focal length of the fourth convex lens 43.

[0050] D. Start the transmission device 2 and the light source 35. The fruit enters the detection dark box 1 for detection. The light emitted by the light source 35 enters the detection dark box 1 after passing through the first convex lens 32, the first reflector 31 and the second convex lens 33. The light entering the detection dark box 1 penetrates the fruit and leaves the detection dark box 1. The light leaving the detection dark box 1 passes through the third convex lens 42, the second reflector 41, the fourth convex lens 43 and the telescopic fiber optic sleeve and is transmitted to the fiber optic probe.

[0051] E. The optical signal received by the fiber optic probe is analyzed and processed to detect the internal quality of the fruit.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fruit internal quality detection device, characterized in that, include: A detection dark box is installed above the transmission device; A light source reflecting box is installed on one side of the detection dark box. A second convex lens and a first convex lens are respectively installed on the side wall of the light source reflecting box near the detection dark box and on the side wall adjacent to the second convex lens. A first reflector is slidably installed inside the light source reflecting box in a direction away from the second convex lens. The first convex lens is slidably set on the side wall of the light source reflecting box in a direction away from the second convex lens. The first convex lens is connected to a light source sleeve that extends out of the light source reflecting box. A light source is installed at the end of the light source sleeve away from the first convex lens. The light emitted by the light source passes through the light source sleeve, the first convex lens, the first reflector, and the second convex lens before entering the detection dark box. as well as An optical fiber receiving box is installed on the other side of the detection dark box. A third convex lens and a fourth convex lens are respectively installed on the side wall of the optical fiber receiving box near the detection dark box and on the side wall adjacent to the third convex lens. A second reflector is slidably installed inside the optical fiber receiving box in a direction away from the third convex lens. The fourth convex lens is slidably set on the side wall of the optical fiber receiving box in a direction away from the third convex lens. The fourth convex lens is connected to a telescopic optical fiber sleeve that extends out of the optical fiber receiving box. An optical fiber probe is installed at the end of the telescopic optical fiber sleeve away from the fourth convex lens. The light emitted from the detection dark box passes through the third convex lens, the second reflector, the fourth convex lens, and the telescopic optical fiber sleeve before reaching the optical fiber probe. The first reflector is detachably mounted on the first reflector bracket, and the first reflector bracket is detachably connected to the first reflector base. The first reflector base slides against the bottom wall of the light source reflecting box, and the first reflector base has a first sliding groove extending away from the second convex lens. The bottom wall of the light source reflecting box has a first insertion hole located in the first sliding groove, and a first bolt with its end pressed on the first reflector base is screwed into the first insertion hole for fixation. The first convex lens is detachably mounted on the first convex lens bracket, and the side wall of the light source reflection box is provided with a sliding groove for the first convex lens bracket to slide. The first convex lens bracket, the light source sleeve, and the light source are all fixedly mounted with connecting wing plates, and at least one adjusting bolt is screwed into the threaded hole of the connecting wing plate on the first convex lens bracket and the light source sleeve, and at least one adjusting bolt is screwed into the threaded hole of the connecting wing plate on the light source sleeve and the light source. The second reflector is detachably mounted on the second reflector bracket, and the second reflector bracket is detachably connected to the second reflector base. The second reflector base slides against the bottom wall of the fiber optic receiver box, and the second reflector base has a second sliding groove extending away from the direction of the third convex lens. The fiber optic receiver box has a second insertion hole located in the second sliding groove, and a second bolt with its end pressed on the second reflector base is screwed into the second insertion hole for fixation. The fourth convex lens can be detachably mounted on the fourth convex lens bracket, and the side wall of the fiber optic receiver box is provided with a sliding groove for the fourth convex lens bracket to slide. The telescopic fiber optic sleeve includes a threaded outer sleeve and an inner adjusting sleeve, with the ends of the outer sleeve and the inner adjusting sleeve, which are far apart from each other, respectively mounted on the fourth convex lens bracket and the fiber optic probe.

2. The fruit internal quality detection device according to claim 1, characterized in that: Both ends of the detection dark box are equipped with light-shielding silicone plates, and two guide plates close to each other are installed at the inlet end of the detection dark box.

3. The fruit internal quality detection device according to claim 1, characterized in that: The detection dark box has several fastening bolts extending through it, with the ends of the fastening bolts extending out of the light source reflection box and the optical fiber receiving box, respectively, and fastening nuts screwed into both ends of the fastening bolts.

4. A detection method for use with the fruit internal quality detection device according to any one of claims 1-3, characterized in that, Includes the following steps: A. Adjust the installation position and angle of the first reflecting mirror and the first convex lens so that the light emitted from the first convex lens is reflected by the first reflecting mirror and enters the second convex lens, and make the sum of the distances from the first reflecting mirror to the first convex lens and to the second convex lens equal to the focal length of the first convex lens. B. Adjust the installation position and angle of the second reflecting mirror and the fourth convex lens so that the light emitted from the third convex lens is reflected by the second reflecting mirror and enters the fourth convex lens, and the sum of the distances from the second reflecting mirror to the third convex lens and to the fourth convex lens is equal to the focal length of the third convex lens. C. Adjust the length of the telescopic fiber optic sleeve so that the distance from the fourth convex lens to the fiber optic probe is equal to the focal length of the fourth convex lens. D. Start the transmission device and light source. The fruit enters the detection dark box for detection. The light emitted by the light source enters the detection dark box after passing through the first convex lens, the first reflector and the second convex lens. The light entering the detection dark box penetrates the fruit and leaves the detection dark box. The light leaving the detection dark box passes through the third convex lens, the second reflector, the fourth convex lens and the telescopic fiber optic sleeve and is transmitted to the fiber optic probe. E. The optical signal received by the fiber optic probe is analyzed and processed to detect the internal quality of the fruit.

Images