A device for measuring electrical parameters of plant leaves under continuously varying pressure.

Abstract

This utility model discloses a device for measuring the electrical parameters of plant leaves under continuously varying pressure, belonging to the field of plant electrical property measurement technology. It includes a mounting plate, a micrometer screw gauge, a force measuring structure, a clamping structure, a data acquisition unit, and a display. The mounting plate is L-shaped, with the micrometer screw gauge vertically fixed on it. The force measuring structure and the clamping structure are respectively positioned vertically opposite each other on the micrometer screw gauge. This device for measuring the electrical parameters of plant leaves under continuously varying pressure utilizes the micrometer screw gauge for clamping force control. The clamping force adjustment under the control of the micrometer screw gauge has high precision and a sufficiently large range, enabling continuous and stable fine-tuning of the clamping force. Combined with the real-time detection of the dynamic continuous clamping force by the data acquisition unit, the device can measure the electrical parameter values ​​of plant leaves under continuously increasing or decreasing clamping force during plant leaf electrical property testing, thereby improving the fitting accuracy of the curve between the clamping force and the plant leaf electrical parameters and enhancing the practicality of the device.

Description

Technical Field

[0001] This utility model relates to the field of plant electrical property measurement technology, and more specifically, to a device for measuring the electrical parameters of plant leaves under continuously changing pressure. Background Technology

[0002] With advancements in electronic instruments and electrical signal detection technology, plant electrophysiology (PEM) signals can be effectively applied to the rapid study of plant physiological activities and their interactions with the external environment. Plant tissues are the fundamental structures responsible for transmitting electrical signals and protoplasmic movement. Changes in PEM signals are closely related to plant physiological and biochemical processes and are influenced by both biotic and abiotic stresses, providing a theoretical basis for the application of plant electrophysiology. Currently, cell sap solutes in leaves are commonly used as dielectrics. Plant electrical parameters are measured by clamping the leaves between parallel-plate capacitors to form a leaf-plate capacitor. The amplitude, accuracy, and range of the clamping force applied to the leaves during the measurement of plant electrical parameters all have a significant impact on the accurate acquisition of these parameters.

[0003] Chinese invention patent CN104865417A discloses a plant leaf electrical parameter testing electrode capable of online measurement and control of clamping force. It consists of an insulating clamp, insulating pad, electrode, pressure sensor, wire, power strip, plug, nut and screw adjustment mechanism, and controller main board. Under the control of the controller, the pressure sensor detects the clamping force of the electrode on the leaf, and the nut and screw adjustment mechanism adjusts the clamping force to ensure consistent clamping force when measuring electrical parameters of different plants and leaves of different thicknesses. The clamping force is also adjusted according to the leaf's tenderness. However, this technical solution mainly adjusts the distance of the insulating handle by rotating the nut. Due to limitations of the testing device, the accuracy of adjusting the clamping force when testing plant leaf electrical parameters is not high. It can only obtain plant leaf electrical parameters under a few specific clamping forces, making it difficult to obtain plant leaf electrical parameters under dynamic continuous clamping forces. Therefore, the synergistic characteristics of continuous changes in clamping force and the electrophysiological information of plant leaves are not fully explored. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a device for measuring the electrical parameters of plant leaves under continuously changing pressure, so as to overcome the shortcomings of the prior art in terms of low continuity and accuracy of clamping force control and inability to measure the electrical parameters of plant leaves under continuously changing pressure.

[0005] To achieve the above objectives, this utility model provides a device for measuring the electrical parameters of plant leaves under continuously varying pressure, comprising an L-shaped mounting plate, a micrometer screw fixedly mounted on the mounting plate, a force measuring structure and a clamping structure respectively positioned vertically opposite each other on the micrometer screw, and a data acquisition unit and a display fixedly mounted on the mounting plate; The micrometer is adapted to continuously and smoothly drive the clamping structure to move toward the force measuring structure, so as to continuously and stably apply pressure to the plant leaf placed on the force measuring structure. One end of the data acquisition device is electrically connected to the force measuring structure, and the other end is electrically connected to the display.

[0006] Furthermore, the micrometer includes a frame mounted on the mounting plate, an outer tube vertically mounted on the frame, a micrometer screw rotatably mounted on the bottom end of the outer tube, an anvil fixedly mounted on the frame and located directly below the micrometer screw, a coarse adjustment knob rotatably mounted on the top of the outer tube for coarsely adjusting the position of the micrometer screw, and a fine adjustment knob rotatably mounted on the top of the outer tube for finely adjusting the position of the micrometer screw.

[0007] Furthermore, the force measuring structure includes a pressure sensor mounted on the top of the anvil, a first foam board mounted on the top of the pressure sensor, and a first electrode fixedly mounted on the top surface of the first foam board. The pressure sensor is electrically connected to the data acquisition unit. The data acquisition unit is adapted to monitor and record the pressure data of the pressure sensor in real time, and the display is adapted to display the monitoring value of the data acquisition unit in real time.

[0008] Furthermore, the clamping structure includes a second foam board installed at the bottom of the micrometer screw and a second electrode fixedly installed on the bottom surface of the second foam board.

[0009] Furthermore, the first electrode and the second electrode are circular copper plates of the same size.

[0010] Furthermore, the diameters of the micrometer screw and the anvil are both greater than or equal to the diameter of the pressure sensor, the diameters of the first foam board and the second foam board are the same as the diameter of the pressure sensor, and the diameters of the first electrode and the second electrode do not exceed the diameter of the pressure sensor.

[0011] Furthermore, it also includes an LCR meter, which is used to measure the electrical parameters of plant leaves, and the LCR meter is electrically connected to the first electrode and the second electrode respectively.

[0012] Furthermore, a first wire is installed on the first foam board, with one end connected to the first electrode and the other end connected to the LCR tester, and a second wire is installed on the second foam board, with one end connected to the second electrode and the other end connected to the LCR tester.

[0013] Furthermore, both the horizontal and vertical sections of the mounting plate are equipped with connecting rods that are fixedly connected to the frame.

[0014] Compared with the prior art, this utility model has the following advantages and effects: 1. The device for measuring the electrical parameters of plant leaves under continuously changing pressure in this utility model utilizes a micrometer screw gauge to regulate the clamping force. The clamping force adjustment under the control of the micrometer screw gauge has high precision and a sufficiently large range, and can continuously and stably achieve fine-tuning of the clamping force. Combined with the real-time detection of the dynamic continuous clamping force by the data acquisition device, the electrical parameter values ​​of plant leaves can be measured when the clamping force is continuously and stably increased or decreased during the electrical characteristic test of plant leaves. This improves the fitting accuracy of the curve between the clamping force and the electrical parameters of plant leaves, and enhances the practicality of the device.

[0015] 2. The device for measuring the electrical parameters of plant leaves under continuously changing pressure in this utility model connects the display to the data acquisition unit. When in use, the display can show the value and changes of the clamping force in real time, so that the operator can grasp the current value and changes of the clamping force. This prevents the clamping force from exceeding the preset pressure threshold during the adjustment of the clamping force, and effectively prevents the plant leaves from being damaged by overload pressure.

[0016] 3. When using the device for measuring the electrical parameters of plant leaves under continuously varying pressure, the micrometer has high strength and adjustment accuracy, which helps to increase the upper limit of the applied clamping force. This allows for expanding the range of forces that can be applied during plant leaf testing while ensuring the accuracy of the clamping force, thereby increasing the range of plant species and leaf tenderness that the device can detect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device for measuring the electrical parameters of plant leaves under continuously changing pressure in an embodiment of this utility model. Figure 2 for Figure 1 Schematic diagram of the installation structure of the force measuring structure and the clamping structure; Figure 3 This is a schematic diagram of the force-measuring structure of the device for measuring electrical parameters of plant leaves under continuously varying pressure in an embodiment of this utility model. Figure 4 This is a schematic diagram of the clamping structure of the device for measuring the electrical parameters of plant leaves under continuously varying pressure in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1-Mounting plate; 2-Micrometer screw gauge; 21-Frame; 22-Outer tube; 23-Micrometer screw; 24-Anvil; 25-Coarse adjustment knob; 26-Fine adjustment knob; 3-Force measuring structure; 31-Pressure sensor; 32-First foam board; 33-First electrode; 34-First wire; 4-Clamping structure; 41-Second foam board; 42-Second electrode; 43-Second wire; 5-Data Acquisition Unit; 6- Monitor; 7-LCR tester. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please see Figure 1-4 As shown in the figure, this utility model embodiment provides a device for measuring the electrical parameters of plant leaves under continuously changing pressure, including a mounting plate 1, a micrometer screw gauge 2, a force measuring structure 3, a clamping structure 4, a data acquisition unit 5, and a display 6.

[0022] Mounting plate 1 is L-shaped. Micrometer 2 is vertically fixed on mounting plate 1. Force measuring structure 3 and clamping structure 4 are respectively positioned vertically opposite each other on micrometer 2. Data acquisition unit 5 and display 6 are fixedly mounted on mounting plate 1.

[0023] The micrometer 2 is adapted to continuously and smoothly drive the clamping structure 4 to move toward the force measuring structure 3, so as to continuously and stably apply pressure to the plant leaf placed on the force measuring structure 3.

[0024] One end of the data acquisition unit 5 is electrically connected to the force measuring structure 3, and the other end is electrically connected to the display 6; so as to display in real time the clamping force on the plant leaf between the force measuring structure 3 and the clamping structure 4.

[0025] Please see Figure 1As shown, the micrometer 2 includes a frame 21, an outer tube 22, a micrometer screw 23, an anvil 24, a coarse adjustment knob 25, and a fine adjustment knob 26. The frame 21 is mounted on the mounting plate 1, the outer tube 22 is vertically mounted on the frame 21, the micrometer screw 23 is rotatably mounted on the bottom end of the outer tube 22, the anvil 24 is fixedly mounted on the frame 21 and located directly below the micrometer screw 23, the coarse adjustment knob 25 is rotatably mounted on the top of the outer tube 22 and is used to coarsely adjust the position of the micrometer screw 23, and the fine adjustment knob 26 is rotatably mounted on the top of the outer tube 22 and is used to finely adjust the position of the micrometer screw 23.

[0026] As a further description of the above solution, rotating the coarse adjustment knob 25 can efficiently and quickly adjust the position of the micrometer screw 23. The micrometer screw 23 has a large movement span and low accuracy, which is suitable for use when the micrometer screw 23 and the anvil 24 are far apart. On the other hand, rotating the fine adjustment knob 26 can continuously and stably adjust the position of the micrometer screw 23. The movement accuracy of the micrometer screw 23 is high and stable, which is suitable for use when the gap between the micrometer screw 23 and the anvil 24 is small, so that the micrometer screw 23 can continuously and stably move closer to or away from the anvil 24.

[0027] Please see Figure 1-3 As shown, the force measuring structure 3 includes a pressure sensor 31, a first foam board 32, and a first electrode 33. The pressure sensor 31 is mounted on the top of the anvil 24, the first foam board 32 is mounted on the top of the pressure sensor 31, and the first electrode 33 is fixedly mounted on the top surface of the first foam board 32. The pressure sensor 31 is electrically connected to the data acquisition unit 5. The data acquisition unit 5 is adapted to monitor and record the pressure data of the pressure sensor 31 in real time, and the display 6 is adapted to display the monitoring value of the data acquisition unit 5 in real time.

[0028] As a further description of the above solution, before use, this application requires setting a pressure threshold based on the maximum pressure that the plant leaves can withstand. When adjusting the micrometer 2 to apply pressure, the operator should try to make the applied pressure close to the pressure threshold, but should not make the applied pressure exceed the pressure threshold. Therefore, when using the micrometer 2, the operator can adjust it according to the value displayed on the display 6 to prevent the pressure from exceeding the maximum pressure that the plant leaves can withstand while continuously and steadily adjusting the pressure applied by the micrometer 2.

[0029] Please see Figure 1-2 and Figure 4 As shown, the clamping structure 4 includes a second foam board 41 and a second electrode 42. The second foam board 41 is installed at the bottom of the micrometer screw 23, and the second electrode 42 is fixedly installed on the bottom surface of the second foam board 41.

[0030] As a further description of the above scheme, during the process of the micrometer screw 23 driving the clamping structure 4 to move downward, the second foam plate 41 will move closer to the plant leaf placed on the first foam plate 32, so that the second foam plate 41 cooperates with the first foam plate 32 to clamp the plant leaf, and as the micrometer screw 23 continues to move downward, it will apply pressure to the plant leaf; and during this process, if the micrometer screw 2 adjusts the movement of the micrometer screw 23 with the fine adjustment knob 26, the increase or decrease of the clamping force of the plant leaf can be made more continuous, stable and accurate, so as to explore the synergistic change characteristics of the continuous change of clamping force and the electrophysiological information of the plant leaf.

[0031] Please see Figure 3-4 As shown, the first electrode 33 and the second electrode 42 are circular copper plates of the same size.

[0032] Please see Figure 1-4 As shown, the diameters of the micrometer screw 23 and the anvil 24 are both greater than or equal to the diameter of the pressure sensor 31. The diameters of the first foam plate 32 and the second foam plate 41 are the same as the diameter of the pressure sensor 31. The diameters of the first electrode 33 and the second electrode 42 do not exceed the diameter of the pressure sensor 31. During the process of the first foam plate 32 and the second foam plate 41 approaching each other to clamp the plant leaf and continuously increasing the clamping force, the first electrode 33 and the second electrode 42 can respectively adhere to both sides of the plant leaf.

[0033] Please see Figure 1-2 As shown, it also includes an LCR tester 7, which is used to measure the electrical parameters of plant leaves. The LCR tester 7 is electrically connected to the first electrode 33 and the second electrode 42, respectively, so that the LCR tester 7 applies a small-amplitude sinusoidal AC voltage of known frequency and amplitude to the plant leaves using the first electrode 33 and the second electrode 42.

[0034] Please see Figure 1-4 As shown, a first wire 34 is installed on the first foam board 32, with one end connected to the first electrode 33 and the other end connected to the LCR tester 7. A second wire 43 is installed on the second foam board 41, with one end connected to the second electrode 42 and the other end connected to the LCR tester 7. The first wire 34 and the second wire 43 are adapted to transmit the test voltage at the output terminal of the LCR tester 7 to the first electrode 33 and the second electrode 42.

[0035] Please see Figure 1 As shown, both the horizontal and vertical sections of the mounting plate 1 are equipped with connecting rods that are fixedly connected to the frame 21; the connecting rods ensure the stability of the frame 21 during installation.

[0036] It should be noted that the micrometer 2 has high strength and adjustment precision, which helps to increase the upper limit of the applied clamping force. This allows for a wider range of forces that can be applied during plant leaf testing while ensuring the accuracy of the clamping force, thereby increasing the range of plant species and leaf tenderness that the device can detect.

[0037] The working process of the device described above for measuring the electrical parameters of plant leaves under continuously varying pressure is as follows: When using the device for measuring the electrical parameters of plant leaves under continuously varying pressure, first confirm the maximum pressure that the plant leaf to be tested can withstand, set the pressure threshold according to its maximum withstand pressure, then place the plant leaf to be tested on the first foam board 32 at the top of the anvil 24 so that the first electrode 33 corresponds to the position of the plant leaf to be tested. Then, rotate the coarse adjustment knob 25 to move the micrometer screw 23 down until the second foam board 41 at the bottom of the micrometer screw 23 is in contact with or about to approach the plant leaf to be tested. Next, the movement of the micrometer screw 23 needs to be adjusted by rotating the fine adjustment knob 26 so that the micrometer screw 23 drives the second foam plate 41 to continuously and stably apply pressure to the plant leaf, so that the clamping force increases or decreases evenly and continuously. During this process, the pressure sensor 31 will detect the change of clamping force in real time, and the data acquisition device 5 will record the data of the continuously changing pressure. In addition, the LCR tester 7 will record the electrical parameters of the plant leaf, so as to facilitate the investigation of the electrical parameter values ​​of the plant leaf under the condition of continuous increase or decrease of clamping force. In addition, the data acquisition device 5 and the display 6 work together to display the changes in clamping force on the display 6. Operators can pay attention to the pressure value on the display 6 to avoid the clamping force from exceeding the preset pressure threshold, so as to prevent the plant leaves from being damaged by overload pressure.

[0038] It should be noted that the acquisition and display of pressure data are both conventional technical methods and do not involve any improvement to the control program.

[0039] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A device for measuring electrical parameters of a plant leaf under continuously varying pressure, characterized in that, It includes an L-shaped mounting plate (1), a micrometer (2) vertically fixed on the mounting plate (1), a force measuring structure (3) and a clamping structure (4) respectively positioned vertically on the micrometer (2), and a data acquisition unit (5) and a display (6) fixed on the mounting plate (1); The micrometer (2) is adapted to continuously and smoothly drive the clamping structure (4) to move toward the force measuring structure (3) so as to continuously and stably apply pressure to the plant leaf placed on the force measuring structure (3); One end of the data acquisition device (5) is electrically connected to the force measuring structure (3), and the other end is electrically connected to the display (6).

2. The apparatus for measuring electrical parameters of plant leaves under continuously varying pressure according to claim 1, characterized in that, The micrometer (2) includes a frame (21) mounted on the mounting plate (1), an outer tube (22) mounted vertically on the frame (21), a micrometer screw (23) rotatably mounted on the bottom end of the outer tube (22), an anvil (24) fixedly mounted on the frame (21) and located directly below the micrometer screw (23), a coarse adjustment knob (25) rotatably mounted on the top of the outer tube (22) for coarsely adjusting the position of the micrometer screw (23), and a fine adjustment knob (26) rotatably mounted on the top of the outer tube (22) for finely adjusting the position of the micrometer screw (23).

3. The device for determining the electrical parameters of a plant leaf at a continuously varying pressure according to claim 2, characterized in that The force measuring structure (3) includes a pressure sensor (31) mounted on the top of the anvil (24), a first foam board (32) mounted on the top of the pressure sensor (31), and a first electrode (33) fixedly mounted on the top surface of the first foam board (32). The pressure sensor (31) is electrically connected to the data acquisition device (5). The data acquisition device (5) is adapted to monitor and record the pressure data of the pressure sensor (31) in real time, and the display (6) is adapted to display the monitoring value of the data acquisition device (5) in real time.

4. The device for determining the electrical parameters of a plant leaf at a continuously varying pressure according to claim 3, characterized in that The clamping structure (4) includes a second foam board (41) installed at the bottom of the micrometer screw (23) and a second electrode (42) fixedly installed on the bottom surface of the second foam board (41).

5. The device for determining the electrical parameters of a plant leaf at a continuously varying pressure according to claim 4, characterized in that The first electrode (33) and the second electrode (42) are circular copper plates of the same size.

6. The apparatus for determining electrical parameters of a plant leaf under a continuously varying pressure according to claim 4, wherein, The diameters of the micrometer screw (23) and the anvil (24) are both greater than or equal to the diameter of the pressure sensor (31), the diameters of the first foam board (32) and the second foam board (41) are the same as the diameter of the pressure sensor (31), and the diameters of the first electrode (33) and the second electrode (42) do not exceed the diameter of the pressure sensor (31).

7. The apparatus for determining electrical parameters of a plant leaf under a continuously varying pressure according to claim 4, wherein, Also includes: LCR tester (7), the LCR tester (7) is used to measure the electrical parameters of plant leaves, and the LCR tester (7) is electrically connected to the first electrode (33) and the second electrode (42) respectively.

8. The apparatus for measuring electrical parameters of plant leaves under continuously varying pressure according to claim 7, characterized in that, A first wire (34) is installed on the first foam board (32), with one end connected to the first electrode (33) and the other end connected to the LCR tester (7). A second wire (43) is installed on the second foam board (41), with one end connected to the second electrode (42) and the other end connected to the LCR tester (7).

9. The apparatus for determining electrical parameters of a plant leaf under a continuously varying pressure according to claim 2, wherein, The horizontal and vertical sections of the mounting plate (1) are each equipped with connecting rods that are fixedly connected to the frame (21).

Images