Tomato maturity detection device
Through photoacoustic effect theory and acoustic amplifier combined with laser emitters and piezoelectric sensors, the existing tomato ripening device has strong environmental dependence and low detection accuracy, and efficient and accurate tomato ripening detection is achieved, supporting large-scale and individualized evaluation.
Patent Information
- Application Number
- CN202422485826.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-10-15
AI Technical Summary
The existing tomato ripening device has high ambient lighting requirements, poor real-time performance, high influence by fruit branches and leaves, and high equipment requirements, resulting in low detection accuracy and efficiency, making it difficult to achieve remote monitoring and rapid discrimination.
Using photoacoustic effect theory, acoustic amplifiers are used to enhance the weak acoustic signal generated by ethylene gas. Combined with a laser emitter and piezoelectric sensor, the angle and position of the frame are adjusted to achieve efficient and accurate detection of tomato ripening.
It improves the sensitivity and accuracy of detection, can adapt to different detection needs, realizes rapid large-scale inspections and precise individual evaluations, and supports refined agricultural management.
Smart Images
Figure CN223091809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tomato maturity detection, and more specifically, to a tomato maturity detection device. Background Art
[0002] In the field of agricultural production, tomatoes, as an important fruit and vegetable widely planted, the accurate detection of their maturity is of crucial significance for grasping the picking time, quality control, and market supply. Tomatoes at different maturities have differences in taste, flavor, and nutritional components. By detecting the maturity, it is possible to determine the optimal time for picking tomatoes in terms of quality. For example, fully mature tomatoes usually have a sweeter and juicier taste and a more intense flavor. If picked too early, the tomatoes may taste sour and lack flavor; if picked too late, the tomatoes may become overripe and soft, prone to rot, affecting the quality. Accurately judging the maturity helps to pick tomatoes at the most suitable stage for storage and transportation, which can extend the shelf life of tomatoes and reduce losses during transportation and storage. For wholesalers, retailers, and consumers, it can ensure the purchase of tomatoes with better quality and longer preservation time.
[0003] However, the existing tomato maturity detection devices have the following problems when in use:
[0004] The existing technical solution realizes the detection of tomato maturity through image processing technology and discriminates the tomato maturity using image processing technology. The environmental requirements are high. When collecting images in a greenhouse, it is necessary to ensure appropriate environmental light to ensure that the captured images can be technically processed. Insufficient light will reduce the clarity of tomato images and affect the judgment of maturity; the real-time performance is poor, and the discrimination success rate for fruits in the green-ripe stage and mid-ripe stage is low, and it is greatly affected by the branches and leaves of the fruits themselves; the feedback efficiency is low, and it is necessary to manually collect images recently to determine the maturity, lacking the condition of remotely monitoring the tomato maturity; the equipment requirements are high, and the pixels of the equipment used for shooting largely affect the basis for judging the maturity.
[0005] The utility model applies the theory of photoacoustic effect to realize the highly sensitive detection of ethylene gas. The signal is enhanced by a sound wave amplifier, improving the system's ability to capture weak sound waves, and a piezoelectric sensor is used to receive the sound wave signal, thereby improving the detection accuracy and expanding the application range of the detection. Summary of the Utility Model
[0006] The purpose of the utility model is to solve the technical problems raised in the above background art and provide a tomato maturity detection device.
[0007] To achieve the above object, the present utility model provides the following technical solutions: A tomato maturity detection device, comprising: a base, a horizontal clamping block is rotatably installed above the base, a frame is rotatably installed on the outer side surface of the horizontal clamping block, a laser emitter is arranged above the horizontal clamping block, acoustic wave amplifiers are arranged on both the left and right sides of the base, a bottom plate is fixedly installed in the middle of the upper end of the base, a support column is fixedly installed on the upper end of the bottom plate, a first rotating rod and a second rotating rod are respectively rotatably installed on the upper and lower sides inside the support column, horizontal clamping blocks are rotatably installed on the surfaces of the first rotating rod and the second rotating rod, the number of the horizontal clamping blocks is two, the laser emitter is installed at the steel beam on the top of the greenhouse, and the acoustic wave amplifiers are equidistantly distributed between the tomato planting ridges.
[0008] Further preferred solution: Motors I are fixedly installed at both the upper end and the bottom of the support column, the output end of the motor I at the upper end of the support column is fixedly connected to the first rotating rod, and the output end of the motor I at the bottom of the support column is fixedly connected to the second rotating rod.
[0009] Further preferred solution: Socket holes are formed on the inner side surfaces of the horizontal clamping blocks, and the horizontal clamping blocks are rotatably installed on the surfaces of the first rotating rod and the second rotating rod through the socket holes.
[0010] Further preferred solution: Fixed columns are fixedly installed on the outer end surfaces of the horizontal clamping blocks, connecting arms are rotatably installed at both the front and rear ends of the fixed columns, support rods are fixedly installed at both the front and rear ends of the connecting arms close to the fixed column side, a double-headed motor is arranged between the support rods, and the output ends of the double-headed motor are fixedly connected to the support rods.
[0011] Further preferred solution: Third rotating rods are rotatably installed at both the front and rear ends of the connecting arm far from the fixed column side, a motor II is fixedly installed on the left side of the front end of the connecting arm, and the output end of the motor II is fixedly connected to the third rotating rod.
[0012] Further preferred solution: The third rotating rod is fixedly connected to the back surface of the frame, a fixed clamp is fixedly installed in the middle of the inner side surface of the frame, the other end of the fixed clamp is nested on the surface of the third rotating rod and fixedly connected thereto, and arc-shaped grooves are formed on both the front and rear sides of the fixed clamp.
[0013] Further preferred solution: Concave mirrors are fixedly installed in the middle of the outer side surfaces of the frames, strip lights are fixedly installed on both the front and rear sides of the concave mirrors, and a piezoelectric sensor is fixedly installed below the concave mirror.
[0014] Beneficial effects:
[0015] 1. By setting up an acoustic wave amplifier, the acoustic wave amplifier can significantly enhance the weak acoustic wave signals generated by the thermal expansion of ethylene gas. During the ripening process of tomatoes, the acoustic waves generated by the transient thermal expansion of ethylene gas may originally be relatively weak and difficult to directly and accurately detect. However, the presence of the acoustic wave amplifier amplifies these acoustic wave signals, thereby improving the sensitivity of the detection device to acoustic wave signals and enabling it to more accurately capture the minute changes occurring during the ripening process of tomatoes;
[0016] 2. By providing transverse clamping plates, connecting arms, and fixing clips, the transverse clamping plates are driven to rotate by the first rotating rod and the second rotating rod, and the first rotating rod and the second rotating rod rotate independently. Therefore, the concave mirrors can be adjusted independently. The connecting arms enable the frame to be adjusted in the longitudinal angle, and the fixing clips are used to adjust the pitching angle, achieving fine adjustment of the pitching angle of the frame. The three components are used in combination to position the concave mirrors on the frame at appropriate positions to reflect the laser beam;
[0017] 3. By providing concave mirrors, by independently controlling each concave mirror unit and regulating the pitching angle of the concave mirrors, the laser is directed to irradiate the corresponding tomato planting areas. This strategy enables the system to collectively irradiate multiple tomatoes within a certain area and quickly obtain the average value of the ethylene concentration in the area, which is suitable for large - batch rapid maturity detection. Utilizing the rotational ability of the concave mirrors on the support columns, by concentrating multiple laser beams on a specific tomato plant, this enables the system to accurately position - irradiate a single tomato plant and then conduct a detailed maturity analysis on it, achieving precise individual maturity assessment;
[0018] 4. In summary, this tomato maturity detection device, through the provision of structures such as transverse clamping plates, frames, fixing clips, laser emitters, and acoustic wave amplifiers, realizes the efficient and accurate detection of tomato maturity. These structures cooperate with each other, can flexibly adjust the angles of the concave mirrors, ensure that the laser can accurately irradiate the tomato surface, thereby generating acoustic waves (mechanical waves), and enhancing the acoustic wave signals through the acoustic wave amplifier, improving the sensitivity and accuracy of detection. At the same time, the design of the concave mirrors enables the device to adapt to different detection requirements, capable of both large - batch rapid maturity detection and precise individual maturity assessment. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0020] Figure 2 It is a schematic diagram of the support column structure of the present utility model.
[0021] Figure 3 It is a schematic diagram of the transverse clamping block structure of the present utility model.
[0022] Figure 4 This is a schematic diagram of the front structure of the frame of the present utility model.
[0023] Figure 5 This is a schematic diagram of the working principle flow of the present utility model.
[0024] Figures 1-5 Where: 1. Base; 101. Bottom plate; 102. Support column; 103. Motor 1; 104. Rotating rod 1; 105. Rotating rod 2; 2. Transverse clamping block; 201. Sleeve hole; 202. Fixed column; 203. Connecting arm; 204. Support rod; 205. Double-headed motor; 206. Rotating rod 3; 207. Motor 2; 3. Frame; 301. Fixed clamp; 302. Arc-shaped groove; 303. Concave mirror; 304. Light strip; 305. Piezoelectric sensor; 4. Laser emitter; 5. Sound wave amplifier. Specific implementation manners
[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying Figures 1-5 drawings in the embodiments of the present utility model.
[0026] Please refer to Figures 1-5, in the embodiment of the present utility model, a tomato maturity detection device includes: a base 1, a horizontal clamp 2 is rotatably installed above the base 1, a frame 3 is rotatably installed on the outer side surface of the horizontal clamp 2, a laser emitter 4 is arranged above the horizontal clamp 2, acoustic wave amplifiers 5 are arranged on both the left and right sides of the base 1, a bottom plate 101 is fixedly installed in the middle of the upper end of the base 1, a support column 102 is fixedly installed on the upper end of the bottom plate 101, a first rotating rod 104 and a second rotating rod 105 are respectively rotatably installed on the upper and lower sides inside the support column 102, the first rotating rod 104 and the second rotating rod 105 are rotatably installed with the horizontal clamp 2 on their surfaces, the number of the horizontal clamps 2 is two, the laser emitter 4 is installed at the steel beam on the top of the greenhouse, the acoustic wave amplifiers 5 are equidistantly distributed among the tomato planting ridges, concave mirrors 303 are fixedly installed in the middle of the outer side surfaces of the frames 3, strip lights 304 are fixedly installed on both the front and back sides of the concave mirrors 303, a piezoelectric sensor 305 is fixedly installed below the concave mirrors 303, the bottom plate 101 and the support column 102 provide a stable support structure for the entire device, the first rotating rod 104 and the second rotating rod 105 inside the support column 102 enable the horizontal clamp 2 to rotate, facilitating the adjustment of the horizontal clamping angle of the frame 3, and the first rotating rod 104 and the second rotating rod 105 are separated from each other, so when adjusting the horizontal angle of the frame 3, separate adjustment can be carried out. At the same time, the base 1 is fixed at the gully between every two ridges in the greenhouse, facilitating the concave mirror 303 on the frame 3 to reflect the laser beam, so that it is concentrated on the ethylene gas around a single tomato, or adjusting multiple concave mirrors 303 simultaneously to make the reflected laser beams concentrated on a certain tomato area. The laser emitter 4 is connected to the steel frame on the top of the greenhouse, and the laser emitter 4 consists of a laser and a control circuit. The laser emitter 4 uses a DFB laser to provide stable output, generates laser with a specific wavelength by embedding a periodic grating (usually a Bragg grating) in the optical waveguide of the laser, and enables the laser to irradiate on the concave mirror 303. The acoustic wave amplifier 5 consists of a microphone and a signal processing circuit, and is evenly distributed among the tomato planting ridges to enhance the acoustic wave signal generated by the photoacoustic effect. The piezoelectric sensor 305 is designed in a square style and is located at the border of the concave mirror 303, responsible for capturing the acoustic wave signal generated by the reaction of ethylene gas and converting it into an electrical signal (voltage). A single-chip microcomputer control unit is shared and connected among the piezoelectric sensor 305, the acoustic wave amplifier 5, the strip light 304 and the laser emitter 4. The single-chip microcomputer control unit can perform data processing and analysis, fine parameter adjustment and iterative optimization according to the signals collected in real time, and automatically respond to environmental changes and ethylene concentration fluctuations through PID control and fuzzy logic control to achieve a closed-loop feedback mechanism. When using this device to detect the maturity of tomatoes, first, the entire greenhouse is scanned by a lidar (LiDAR) to obtain the three-dimensional point cloud data of the greenhouse, and the specific positions of each tomato are determined through the point cloud data. Then, the laser emitter 4 located at the top of the planting greenhouse is controlled to emit laser with a specific wavelength, and the laser is irradiated on the concave mirror 303 beside the tomato vegetation.By rotating the first rotating rod 104 and the second rotating rod 105, the lateral angles of the two concave mirrors 303 are adjusted. The longitudinal angle of the concave mirror 303 is adjusted by the lateral clamping block 2, so that the concave mirror 303 can reflect the laser beam onto the tomato surface. Since ethylene gas is generated during the growth and ripening process of tomatoes, the laser of these specific wavelengths will be absorbed by the ethylene gas, resulting in an increase in the temperature of the ethylene gas. The ethylene gas undergoes transient thermal expansion, causing the surrounding air to be compressed and generating acoustic signals. Then these acoustic signals are absorbed by the acoustic wave amplifier 5 and the acoustic signals generated by the acoustic wave amplifier 5 are enhanced. After these amplified acoustic signals reach the surface of the piezoelectric sensor 305, they cause slight changes in the shape and thickness of the piezoelectric material. This change will cause a change in the distribution of polar charges inside the material. Due to the piezoelectric effect, the charges inside the piezoelectric material will generate a voltage due to the change in mechanical stress. The magnitude of this voltage is proportional to the amplitude and frequency of the acoustic wave. Also, since the amplitude and frequency of the acoustic wave are proportional to the ethylene concentration, the magnitude of the ethylene concentration can be judged by the magnitude of the voltage at this time. Then the voltage data in the piezoelectric sensor 305 will be transmitted to the data processing unit of the single-chip microcomputer. The single-chip microcomputer receives the voltage data and uses the Isolation Forest algorithm (an outlier detection algorithm) to filter the data to eliminate outliers, and uses the trained machine learning algorithm (BP neural network algorithm), combined with the input data voltage, to infer the maturity of the tomatoes. Finally, all the data processing results (tomato maturity, point cloud data - tomato spatial position coordinates) are sent to the database (MySQL) through the Wi-Fi module (ESP8266). A mobile application is built using ReactNative, enabling users to receive real-time data on their mobile phones. In the mobile application, the maturity of the tomatoes and the orientation information of the ripe tomatoes are displayed using a graph (Chart.js). At the same time, for tomatoes that meet the picking standard, the LED light strip 304 of the concave mirror 303 next to them will light up to indicate to the staff to pick.
[0027] In the embodiment of the present utility model, motors 103 are fixedly installed at both the upper end and the bottom of the support column 102. The output end of the motor 103 at the upper end of the support column 102 is fixedly connected to the first rotating rod 104, and the output end of the motor 103 at the bottom of the support column 102 is fixedly connected to the second rotating rod 105. Socket holes 201 are formed on the inner sides of the transverse clamping blocks 2, and the transverse clamping blocks 2 are rotatably installed on the surfaces of the first rotating rod 104 and the second rotating rod 105 through the socket holes 201. When adjusting the horizontal angle of the concave mirror 303, since frames 3 are provided on the outer sides of the transverse clamping blocks 2, and the transverse clamping blocks 2 are respectively nested and fixed on the surfaces of the first rotating rod 104 and the second rotating rod 105 through the socket holes 201, when adjusting the frames 3 on both sides, they can be adjusted separately. By operating the motor 103 at the upper end of the support column 102, the first rotating rod 104 can be driven to rotate. By rotating the motor 103 at the bottom of the support column 102, the second rotating rod 105 can be driven to rotate. The rotation of the first rotating rod 104 and the second rotating rod 105 can drive the transverse clamping blocks 2 to adjust the horizontal angle, thereby driving the frames 3 on the transverse clamping blocks 2 to move horizontally, enabling the concave mirror 303 to adapt to tomatoes of different shapes and sizes, ensuring that the laser can accurately irradiate the surface of the tomatoes, and improving the accuracy and versatility of detection.
[0028] In the embodiment of the present utility model, fixed columns 202 are fixedly installed on the outer ends of the transverse clamping blocks 2. Connecting arms 203 are rotatably installed at both the front and rear ends of the fixed columns 202. Support rods 204 are fixedly installed at both the front and rear ends of the connecting arms 203 close to the fixed columns 202. A double-headed motor 205 is arranged between the support rods 204, and the output ends of the double-headed motor 205 are fixedly connected to the support rods 204. When adjusting the horizontal angle of the concave mirror 303, the double-headed motor 205 is driven. The output directions of the two output ends of the double-headed motor 205 are in the same direction. Therefore, the support rods 204 can be driven to rotate inside the fixed columns 202. When the support rods 204 rotate, the connecting arms 203 will move upward or downward on the surfaces of the fixed columns 202, thereby changing the longitudinal angle of the frame 3, enabling the concave mirror 303 to be at an appropriate longitudinal height, so as to better reflect the laser beam onto the surface of the tomatoes and improve the accuracy of detection.
[0029] In the embodiment of the present utility model, a third rotating rod 206 is rotatably installed at the front and rear ends of the side of the connecting arm 203 far from the fixed column 202. A second motor 207 is fixedly installed on the left side of the front end of the connecting arm 203. The output end of the second motor 207 is fixedly connected to the third rotating rod 206. The third rotating rod 206 is fixedly connected to the back surface of the spectacle frame 3. A fixed clip 301 is fixedly installed in the middle of the inner side surface of the spectacle frame 3. The other end of the fixed clip 301 is nested on the surface of the third rotating rod 206 and fixedly connected thereto. Arc-shaped grooves 302 are formed on both the front and rear sides of the fixed clip 301. When the connecting arm 203 drives the concave mirror 303 to change the longitudinal angle, the second motor 207 is driven. The second motor 207 can rotate the third rotating rod 206, and the rotation of the third rotating rod 206 will drive the fixed clip 301 to adjust the longitudinal angle, so as to adjust the longitudinal angle of the spectacle frame 3. Since the spectacle frame 3 is directly connected to the third rotating rod 206 through the fixed clip 301, the third rotating rod 206 can drive the spectacle frame 3 to adjust its own angle of inclination, and the pitching angle of the spectacle frame 3 can be adjusted, so that the concave mirror 303 can better align with the tomato, ensuring that the laser can be accurately reflected onto the surface of the tomato. When adjusting the pitching angle of the spectacle frame 3, the connecting arm 203 slides in the arc-shaped groove 302, so that the spectacle frame 3 can smoothly adjust the pitching angle, avoiding excessive friction caused by excessive contact between the connecting arm 203 and the spectacle frame 3 and making it impossible to adjust the pitching angle.
[0030] Working principle: When using this device to detect the ripeness of tomatoes, first fix the base 1 equidistantly at the gully between every two ridges in the greenhouse to ensure the stability of the whole device. Then install the laser emitter 4 at the steel beam on the top of the greenhouse, and the acoustic wave amplifiers 5 are distributed equidistantly between the tomato planting ridges. The piezoelectric sensor 305 is designed in a square style and is located at the border of the concave mirror 303. A shared single-chip microcomputer control unit is connected between the piezoelectric sensor 305, the acoustic wave amplifier 5, the light strip 304 and the laser emitter 4. This unit can perform data processing and analysis, fine parameter adjustment and iterative optimization, and automatically respond to environmental changes and ethylene concentration fluctuations through PID control and fuzzy logic control to achieve a closed-loop feedback mechanism. Then, use lidar to scan the whole greenhouse to obtain the three-dimensional point cloud data of the greenhouse, and determine the specific position of each tomato according to the point cloud data. Then control the laser emitter 4 located on the top of the planting greenhouse to emit laser with a specific wavelength (the adjustable wavelength range is between 266nm and 16um), and make the laser irradiate on the concave mirror 303 beside the tomato vegetation. Adjust the angle of the concave mirror 303 according to the current laser reflection of the concave mirror 303. The motors 103 at the upper end and the bottom of the support column 102 drive the first rotating rod 104 and the second rotating rod 105 to rotate respectively. The rotation of the first rotating rod 104 and the second rotating rod 105 drives the lateral clamping block 2 to make a lateral angle adjustment. Since the outer side of the lateral clamping block 2 is provided with a lens frame 3, and the lateral clamping block 2 is respectively nested and fixed on the surfaces of the first rotating rod 104 and the second rotating rod 105 through the sleeve holes 201, the lens frames 3 on the left and right sides can be adjusted separately, so that the concave mirror 303 can irradiate the tomatoes on both the left and right sides at the same time. Then drive the double-headed motor 205. The two output ends of the double-headed motor 205 output in the same direction, driving the support rod 204 to rotate inside the fixed column 202. The rotation of the support rod 204 makes the connecting arm 203 move up or down on the surface of the fixed column 202, thereby changing the longitudinal angle of the lens frame 3 and making the concave mirror 303 at an appropriate longitudinal height to better reflect the laser beam onto the tomato surface. At this time, drive the motor 207. The motor 207 makes the third rotating rod 206 rotate. The rotation of the third rotating rod 206 drives the fixed clamp 301 to make a longitudinal angle adjustment. Since the lens frame 3 is directly connected to the third rotating rod 206 through the fixed clamp 301, the third rotating rod 206 can drive the lens frame 3 to make its own angle inclination adjustment to adjust the pitch angle of the lens frame 3. When adjusting the pitch angle of the lens frame 3, the connecting arm 203 slides in the arc-shaped groove 302, so that the lens frame 3 can smoothly adjust the pitch angle, avoiding excessive friction caused by excessive contact between the connecting arm 203 and the lens frame 3 and making it impossible to adjust the pitch angle. When the lateral, longitudinal and pitch angles of the lens frame 3 are all adjusted, the concave mirror 303 reflects the laser beam onto the tomato surface. Since tomatoes will produce ethylene gas (the best absorption wavelength is about 1626nm) during the growth and ripening process, and the laser wavelength of the DFB laser emitter can be adjusted in the range of 266nm - 16um.Therefore, when the laser wavelength is adjusted to around 1626 nm, the laser can be fully absorbed by ethylene gas, causing the temperature of the ethylene gas to rise. The ethylene gas undergoes transient thermal expansion, compressing the surrounding air to generate an acoustic wave signal. This acoustic wave signal is a mechanical wave (since the absorption of light by the medium changes its internal temperature, which in turn causes changes in the structure and volume of some regions within the medium. When a pulsed light source or a modulated light source is used, the rise and fall of the medium's temperature cause the volume of the medium to expand and contract, thus enabling the radiation of mechanical waves outward). The acoustic wave signal is absorbed by the acoustic wave amplifier 5, and the acoustic wave signal generated by the acoustic wave amplifier 5 is enhanced. After the amplified acoustic wave signal reaches the surface of the piezoelectric sensor 305, it causes slight changes in the shape and thickness of the piezoelectric material. This change causes a change in the distribution of polar charges inside the material. Due to the piezoelectric effect, the charges inside the piezoelectric material generate a voltage due to changes in mechanical stress. The magnitude of the voltage is proportional to the amplitude and frequency of the acoustic wave. Also, since the amplitude and frequency of the acoustic wave are proportional to the ethylene concentration, the ethylene concentration can be determined by the magnitude of the voltage at this time. The voltage data in the piezoelectric sensor 305 is transmitted to the data processing unit of the single-chip microcomputer. The single-chip microcomputer receives the voltage data and uses the Isolation Forest algorithm (an outlier detection algorithm) to filter the data to eliminate outliers. It applies the trained machine learning algorithm (BP neural network algorithm), combines the input data voltage, and estimates the maturity of the tomatoes. Then, all data processing results (tomato maturity, point cloud data - tomato spatial position coordinates) are sent to the database (MySQL) through the Wi-Fi module (ESP8266). A mobile application is built using React Native. Users receive real-time data on their mobile phones. In the mobile application, the maturity of the tomatoes and the orientation information of the ripe tomatoes are displayed using a graph (Chart.js). For tomatoes that meet the picking standard, the LED strip 304 of the concave mirror 303 beside them will light up to indicate to the staff to pick. During the detection, the reflection laser method of the concave mirror 303 is divided into centralized detection and single detection. Centralized detection mode: By independently controlling each concave mirror 303 unit and adjusting the pitch angle of the concave mirror 303, the laser is directed at the corresponding tomato planting area. This strategy enables the system to irradiate multiple tomatoes within a certain area collectively, quickly obtaining the average value of the ethylene concentration within the area. It is suitable for large-scale rapid maturity detection, optimizing the detection process and improving the work efficiency when processing a large number of samples. Single target detection mode: Utilizing the rotation ability of the concave mirror 303, multiple laser beams are concentrated on a specific tomato plant. This enables the system to accurately position and irradiate a single tomato plant, and then conduct a detailed maturity analysis on it. This detection mode realizes precise individual maturity assessment, providing technical support for fine agricultural management.
Claims
1. A tomato ripeness detection device, comprising: Base (1), a transverse clamping block (2) is rotatably installed above the base (1), a spectacle frame (3) is rotatably installed on the outer side of the transverse clamping block (2), a laser emitter (4) is arranged above the transverse clamping block (2), and acoustic wave amplifiers (5) are arranged on both the left and right sides of the base (1). It is characterized in that: a bottom plate (101) is fixedly installed in the middle of the upper end of the base (1), a support column (102) is fixedly installed on the upper end of the bottom plate (101), a first rotating rod (104) and a second rotating rod (105) are respectively rotatably installed on the upper and lower sides inside the support column (102), the transverse clamping block (2) is rotatably installed on the surfaces of the first rotating rod (104) and the second rotating rod (105), the number of the transverse clamping blocks (2) is two, the laser emitter (4) is installed at the steel beam on the top of the greenhouse, and the acoustic wave amplifiers (5) are evenly distributed between the tomato planting ridges.
2. The tomato maturity detection device according to claim 1, wherein: A first motor (103) is fixedly installed at both the upper end and the bottom of the support column (102). The output end of the first motor (103) at the upper end of the support column (102) is fixedly connected to the first rotating rod (104), and the output end of the first motor (103) at the bottom of the support column (102) is fixedly connected to the second rotating rod (105).
3. The tomato ripeness detection device according to claim 1, wherein: Sleeve holes (201) are respectively opened on the inner sides of the transverse clamping blocks (2), and the transverse clamping blocks (2) are rotatably installed on the surfaces of the first rotating rod (104) and the second rotating rod (105) through the sleeve holes (201).
4. The tomato maturity detection device according to claim 3, characterized in that: Fixed columns (202) are fixedly installed on the outer end faces of the transverse clamping blocks (2). Connecting arms (203) are rotatably installed at both the front and rear ends of the fixed columns (202). Support rods (204) are fixedly installed at both the front and rear ends of the connecting arms (203) close to the fixed columns (202). A double-headed motor (205) is arranged between the support rods (204), and the output ends of the double-headed motor (205) are fixedly connected to the support rods (204).
5. The tomato maturity detection device according to claim 4, characterized in that: Rotating rods three (206) are rotatably installed at both the front and rear ends of the connecting arms (203) far from the fixed columns (202). A second motor (207) is fixedly installed on the left side of the front end of the connecting arm (203), and the output end of the second motor (207) is fixedly connected to the rotating rod three (206).
6. The tomato maturity detection device according to claim 5, wherein: The rotating rod three (206) is fixedly connected to the back of the spectacle frame (3). A fixed clamp (301) is fixedly installed in the middle of the inner side of the spectacle frame (3). The other end of the fixed clamp (301) is nested on the surface of the rotating rod three (206) and fixedly connected thereto. Arc-shaped grooves (302) are respectively opened on both the front and rear sides of the fixed clamp (301).
7. The tomato maturity detection device according to claim 6, characterized in that: Concave mirrors (303) are fixedly installed in the middle of the outer sides of the spectacle frames (3). Light strips (304) are fixedly installed on both the front and rear sides of the concave mirrors (303). A piezoelectric sensor (305) is fixedly installed below the concave mirrors (303).