A material resistivity measuring device and a measuring method thereof

Abstract

This application provides a material resistivity measuring device and method. The material resistivity measuring device includes a constant temperature and humidity control system and a three-electrode measuring system. The constant temperature and humidity control system includes a temperature and humidity controller, an environmental monitoring module, a temperature adjustment module, a humidity adjustment module, and a sealed chamber. The environmental monitoring module, temperature adjustment module, and humidity adjustment module are all located inside the sealed chamber. The three-electrode measuring system includes a first electrode, a ring electrode, a second electrode, and a movement control module. The first electrode, ring electrode, and second electrode are all located inside the sealed chamber. The second electrode is used to place the material to be measured, and the first electrode and ring electrode can move closer to or further away from the second electrode under the control of the movement control module. According to the scheme of this application embodiment, the resistivity of the material to be measured can be measured in situ under different constant temperature and humidity conditions, and the measurement can be quickly switched.

Description

Technical Field

[0001] This application relates to the field of resistivity measurement technology, and in particular to a material resistivity measuring device and its measurement method. Background Technology

[0002] Resistivity is an important parameter characterizing the electrical conductivity of materials, including volume resistivity and surface resistivity. It is widely used in the performance evaluation and application research of polymer materials, composite materials, and coating materials. In existing technologies, resistivity is usually measured using the three-electrode method. This method can reduce the influence of leakage current on the test results, and is therefore widely used in material resistivity testing.

[0003] However, the resistivity of materials is quite sensitive to environmental conditions such as temperature and humidity. Under different constant temperature and humidity conditions, the internal conductivity, surface adsorption state, and leakage current distribution of the material may all change, leading to significant differences in measurement results. Existing testing methods often involve pre-treating the sample under constant temperature and humidity conditions before transferring it to conventional equipment for measurement, or the testing equipment itself lacks stable temperature and humidity control capabilities, causing the sample to deviate from the target environmental conditions during transfer or testing, affecting the authenticity, repeatability, and comparability of the measurement results. Summary of the Invention

[0004] The embodiments of this application are intended to at least solve one of the technical problems existing in the prior art.

[0005] Therefore, this application proposes a material resistivity measuring device that can perform in-situ resistivity measurement and rapid switching measurement of the material under test under different constant temperature and humidity conditions, thereby improving the authenticity, repeatability and comparability of test results under different working conditions.

[0006] This application also proposes a method for measuring material resistivity based on the above-described material resistivity measuring device.

[0007] The material resistivity measuring device according to the first aspect of the embodiments of this application includes: A constant temperature and humidity control system includes a temperature and humidity controller, an environmental monitoring module, a temperature regulation module, a humidity regulation module, and a sealed box. The environmental monitoring module, the temperature regulation module, and the humidity regulation module are all located inside the sealed box, and the environmental monitoring module, the temperature regulation module, and the humidity regulation module are all connected to the temperature and humidity controller. The three-electrode measurement system includes a first electrode, a ring electrode, a second electrode, and a movement control module. The first electrode and the ring electrode are both disposed above the second electrode and are concentrically arranged. Both the first electrode and the ring electrode are connected to the movement control module. The first electrode, the ring electrode, and the second electrode are all disposed inside the sealed box, and the outlets of the connecting wires of the first electrode, the ring electrode, and the second electrode are all disposed on the sealed box. The second electrode is used to place the material to be tested, and the first electrode and the ring electrode can move closer to or further away from each other under the control of the movement control module.

[0008] According to some embodiments of the present application, at least one side of the second electrode is provided with an insulating water-guiding platform; the top surface of the insulating water-guiding platform extends from top to bottom and is gradually inclined away from the second electrode in the horizontal direction.

[0009] According to some embodiments of the present application, the motion control module includes a servo driver, a servo motor, an encoder, and a transmission structure. The servo driver, the servo motor, and the transmission structure are connected in sequence. The encoder is used to monitor the state of the servo motor and is connected to the servo driver. The first electrode and the ring electrode are both connected to the transmission structure.

[0010] According to some embodiments of this application, a measuring bracket is also included. The measuring bracket is disposed inside the sealed box. The measuring bracket includes a placement platform and multiple support rods. The multiple support rods are disposed below the placement platform and are used to support the placement platform. The movement control module is disposed on the placement platform. The first electrode, the ring electrode, and the second electrode are all disposed below the placement platform. The insulating water guide platform is connected to the support rods.

[0011] According to some embodiments of this application, the environmental monitoring module includes a temperature sensor and a humidity sensor, both of which are connected to the temperature and humidity controller.

[0012] According to some embodiments of the present application, the temperature regulation module includes a heating subsystem and a cooling subsystem, both of which are connected to the temperature and humidity controller.

[0013] According to some embodiments of the present application, the humidity control module includes a humidification subsystem and a dehumidification subsystem, both of which are connected to the temperature and humidity controller.

[0014] According to some embodiments of the present application, the temperature and humidity controller is a PLC controller.

[0015] The material resistivity measurement method according to the second aspect of the present application, applied to the material resistivity measurement device described in the above embodiment, includes: The movement control module controls the first electrode and the ring electrode to move away from the second electrode; The material to be tested is placed above the second electrode, the sealed box is closed, and the temperature and humidity controller controls the temperature adjustment module and the humidity adjustment module to work according to the received temperature and humidity settings. When the ambient temperature and humidity in the sealed chamber both reach the set temperature and humidity values, the movement control module controls the first electrode and the ring electrode to move closer to the second electrode, so that the first electrode and the ring electrode are in contact with the material to be tested. Depending on the resistivity measurement type, the resistivity measurement of the material under test is performed by adjusting the connection method of the first electrode, the ring electrode, and the second electrode.

[0016] According to some embodiments of this application, the process of performing resistivity measurement on the material to be measured by adjusting the connection method of the first electrode, the ring electrode, and the second electrode according to the resistivity measurement type includes: When the resistivity measurement type is volume resistivity, the second electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the ring electrode is connected to the reference ground to realize the volume resistivity measurement process. When the resistivity measurement type is surface resistivity, the ring electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the second electrode is connected to the reference ground to realize the surface resistivity measurement process.

[0017] The material resistivity measuring device according to the embodiments of this application has at least the following beneficial effects: The material resistivity measuring device includes a constant temperature and humidity control system and a three-electrode measuring system; wherein, the constant temperature and humidity control system includes a temperature and humidity controller, an environmental monitoring module, a temperature adjustment module, a humidity adjustment module, and a sealed box; the environmental monitoring module, the temperature adjustment module, and the humidity adjustment module are disposed inside the sealed box, so that the environmental monitoring module can monitor and process the environmental temperature and humidity in the sealed box, the temperature adjustment module can adjust the temperature in the sealed box, and the humidity adjustment module can adjust the humidity in the sealed box; the three-electrode measuring system includes a first electrode, a ring electrode, a second electrode, and a movement control module, the first electrode and the ring electrode are disposed above the second electrode, and the movement control module can control the first electrode and the ring electrode to move closer to or further away from each other towards the second electrode, thereby measuring the material resistivity. During the measurement process, the first motor and the ring electrode can be controlled to move away from the second electrode, allowing the material to be tested to be placed on the second electrode. Then, the temperature and humidity controller controls the temperature and humidity adjustment modules to operate. When the ambient temperature and humidity in the sealed chamber reach the set values, the movement control module can be used to control the first electrode and the ring electrode to move closer to the second electrode, so that the first electrode and the ring electrode are in contact with the material to be tested. Subsequently, by changing the connection method of the first electrode, the second electrode, and the ring electrode, the volume resistivity and surface resistivity of the material to be tested can be measured. During this process, the material to be tested in the sealed chamber does not need to be moved, and the material to be tested can be kept in a constant temperature and humidity environment throughout the measurement process. This enables in-situ measurement of resistivity and rapid switching of measurements, which can greatly improve the authenticity, repeatability, and comparability of test results under different working conditions. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solutions of this disclosure and constitute a part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0019] Figure 1 This is a first structural schematic diagram of a material resistivity measuring device provided in one embodiment of this application; Figure 2 This is a schematic diagram of the second structure of a material resistivity measuring device provided in one embodiment of this application; Figure 3 This is a flowchart of a material resistivity measurement method provided in one embodiment of this application; Figure 4 yes Figure 3 The method flowchart for step S400. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the embodiments of this application and are not intended to limit the embodiments of this application.

[0021] In the description of the embodiments of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of the embodiments of this application, unless otherwise expressly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this application in combination with the specific content of the technical solution.

[0023] This application provides a material resistivity measuring device and method. The material resistivity measuring device includes a constant temperature and humidity control system and a three-electrode measuring system. The constant temperature and humidity control system includes a temperature and humidity controller, an environmental monitoring module, a temperature regulation module, a humidity regulation module, and a sealed chamber. The environmental monitoring module, temperature regulation module, and humidity regulation module are located inside the sealed chamber. The environmental monitoring module monitors and processes the ambient temperature and humidity within the sealed chamber, the temperature regulation module regulates the temperature within the sealed chamber, and the humidity regulation module regulates the humidity within the sealed chamber. The three-electrode measuring system includes a first electrode, a ring electrode, a second electrode, and a movement control module. The first electrode and the ring electrode are positioned above the second electrode, and the movement control module controls the first electrode and the ring electrode to move closer to or further away from the second electrode, thereby measuring the material resistivity. During the process, the first motor and the ring electrode can be controlled to move away from the second electrode, allowing the material to be tested to be placed on the second electrode. Then, the temperature and humidity controller controls the temperature and humidity adjustment modules to work. When the ambient temperature and humidity in the sealed chamber reach the set values, the movement control module can be used to control the first electrode and the ring electrode to move closer to the second electrode, so that the first electrode and the ring electrode are in contact with the material to be tested. Subsequently, by changing the connection method of the first electrode, the second electrode, and the ring electrode, the volume resistivity and surface resistivity of the material to be tested can be measured. During this process, it is not necessary to move the material to be tested in the sealed chamber. Moreover, the material to be tested can be kept in a constant temperature and humidity environment during the measurement process, thereby realizing in-situ measurement of resistivity and rapid switching of measurement, which can greatly improve the authenticity, repeatability, and comparability of test results under different working conditions.

[0024] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, Figure 1This is a first structural schematic diagram of a material resistivity measuring device provided in one embodiment of this application. The material resistivity measuring device of this application embodiment includes a constant temperature and humidity control system and a three-electrode measuring system. The constant temperature and humidity control system includes a temperature and humidity controller 100, an environmental monitoring module, a temperature adjustment module, a humidity adjustment module, and a sealed chamber 200. The environmental monitoring module, temperature adjustment module, and humidity adjustment module are all connected to the temperature and humidity controller 100. The environmental monitoring module can measure and process the ambient temperature and humidity in the sealed chamber 200 and transmit the measured temperature and humidity information to the temperature and humidity controller 100. The temperature and humidity controller 100 can control the temperature adjustment module and humidity adjustment module based on the received temperature and humidity information to ensure that the ambient temperature and humidity in the sealed chamber 200 reach the set values. The three-electrode measuring system includes a first electrode 310, a second electrode 330, a ring electrode 320, and a movement control module 400. The first electrode 310 and the ring electrode 320 are disposed above the second electrode 330 and are concentrically arranged. The first electrode 310 and the ring electrode 320 are also connected to the movement control module 400. 0 Connection; Based on the material resistivity measuring device of this application embodiment, during the material resistivity measurement process, the first motor and the ring electrode 320 can be controlled to move away from the second electrode 330, so that the material to be tested can be placed on the second electrode 330. Then, the temperature and humidity controller 100 controls the temperature adjustment module and the humidity adjustment module to work. When the ambient temperature and ambient humidity in the sealed box 200 reach the set value, the movement control module 400 can be used to control the first electrode 310 and the ring electrode 320 to move closer to the second electrode 330, so that the first electrode 310 and the ring electrode 320 are in contact with the material to be tested. Subsequently, by changing the connection method of the first electrode 310, the second electrode 330 and the ring electrode 320, the volume resistivity and surface resistivity of the material to be tested can be measured. During this process, it is not necessary to move the material to be tested in the sealed box 200. In addition, during the measurement process, the material to be tested can always be kept in a constant temperature and humidity environment, thereby realizing in-situ measurement of resistivity and rapid switching measurement, which can greatly improve the authenticity, repeatability and comparability of test results under different working conditions.

[0026] It should be noted that both the first electrode 310 and the ring electrode 320 are positioned above the second electrode 330, and the movement control module 400 can drive the first electrode 310 and the ring electrode 320 to move closer to or further away from the second electrode 330. When the material to be tested needs to be placed, the movement control module 400 can control the first electrode 310 and the ring electrode 320 to move away from the second electrode 330. Under the condition that the measurement is met, the movement control module 400 can control the first electrode 310 and the ring electrode 320 to move closer to the second electrode 330, so that the first electrode 310 and the ring electrode 320 are in contact with the material to be tested. In addition, when testing surface resistivity, the current from the first electrode 310 to the ring electrode 320 is measured. If the current from the first electrode 310 to the ring electrode 320 is placed below the second electrode 330, the surface of the material to be tested will not be able to fully contact moisture due to the close contact with the electrode, affecting the test results. The first electrode 310 and the ring electrode 320 are concentrically arranged, and both have the same horizontal thickness, allowing them to move together.

[0027] It is worth noting that the first electrode 310 and the second electrode 330 in this embodiment are only for distinguishing different electrode components and do not represent that their properties are different. Figure 2 As shown, the first electrode 310, the second electrode 330, and the ring electrode 320 are all connected to independent connecting wires 350, and the outlets 360 of the three connecting wires 350 are all set on the sealed box 200. Thus, external connecting devices can be directly connected to each electrode through the outlets 360 on the sealed box 200 to realize resistivity measurement.

[0028] It is worth noting that during the resistivity measurement of the material under test, the sealed chamber 200, in conjunction with the temperature and humidity control modules, effectively maintains a constant ambient temperature and humidity within the chamber, thereby significantly improving the accuracy of the resistivity measurement. Furthermore, when switching measurement environments, there is no need to move the material under test; simply adjusting the ambient temperature and humidity within the sealed chamber 200 via the temperature and humidity control modules makes resistivity measurement simpler, faster, and more efficient.

[0029] In some embodiments of this application, an insulating water-guiding platform 340 is further provided on at least one side of the second electrode 330. The top surface of the insulating water-guiding platform 340 extends from top to bottom and is gradually inclined away from the second electrode 330 in the horizontal direction. Under high humidity conditions in the sealed chamber 200, water droplets or even water films can easily form on the surface of the material to be tested. The insulating water-guiding platform 340 provided on at least one side of the second electrode 330 can guide the condensate on the surface of the material to be tested away from the test area, thereby reducing the adverse effects of moisture outside the test area on the test results and improving the accuracy of the test results.

[0030] It is worth noting that the cross-section of the insulating water guiding platform 340 can be a right trapezoid or a triangle, as long as the inclined surface of the insulating water guiding platform 340 can be used to guide the condensate formed on the surface of the material to be tested; there is no limitation here.

[0031] In some embodiments of this application, the motion control module 400 may include a servo driver, a servo motor, an encoder, and a transmission structure. The servo driver, servo motor, and transmission structure are connected sequentially, allowing the servo driver to control the working state of the servo motor, which in turn controls the transmission structure. The transmission structure may be a ball screw, which converts the rotational motion of the servo motor into linear motion. The encoder monitors the state of the servo motor and is connected to the servo driver. The encoder sends the detected motion state information of the servo motor to the servo driver, which then controls the servo motor based on the detected information, forming a closed-loop control process and improving control accuracy. The first electrode 310 and the ring electrode 320 are connected to the transmission structure using insulating adhesive, ensuring no electrical conductivity between the transmission structure and the first electrode 310 and the ring electrode 320, thus guaranteeing the accuracy of resistivity measurement.

[0032] Optimally, a distance sensor can also be disposed above the second electrode 330. The distance sensor can measure the distance between the first electrode 310 and the second electrode 330 respectively. The distance between the distance sensor and the second electrode 330 minus the distance between the distance sensor and the first electrode 310 is used to determine the vertical movement distance of the first electrode 310 controlled by the motion control module 400, thereby improving the accuracy of the measurement. For example, the material to be measured is placed on the second electrode 330. The vertical position of the first electrode 310 can be determined by subtracting the distance between the distance sensor and the material to be measured from the distance between the distance sensor and the first electrode 310. This allows the motion control module 400 to better control the vertical movement distance of the first electrode 310 and the ring electrode 320, enabling the first electrode 310 and the ring electrode 320 to better conform to the material to be measured, thus improving the accuracy of resistivity measurement.

[0033] In some embodiments of this application, a measuring bracket is further provided inside the sealed box 200. The measuring bracket includes a placement platform 510 and multiple support rods 520. The multiple support rods 520 are disposed below the placement platform 510 and are used to support the placement platform 510. The movement control module 400 is disposed on the placement platform 510. The first electrode 310, the ring electrode 320, and the second electrode 330 are all disposed below the placement platform 510. The insulating water guiding platform 340 is connected to the support rods 520. Through the above settings, the three-electrode measuring system can be stably disposed inside the sealed box 200, thereby ensuring the accuracy and reliability of resistivity measurement.

[0034] In some embodiments of this application, the environmental monitoring module includes a temperature sensor and a humidity sensor, both of which are connected to the temperature and humidity controller 100. The temperature sensor can conveniently and quickly measure the ambient temperature inside the sealed box 200, and the humidity sensor can conveniently and quickly measure the ambient humidity inside the sealed box 200. Furthermore, the temperature and humidity sensors can send the measured information to the temperature and humidity controller 100, providing a basis for subsequent temperature and humidity adjustment. The temperature sensor can be a Pt100 platinum resistance thermometer, and the humidity sensor can be a wet-bulb / dry-bulb sensor or an electronic humidity sensor.

[0035] In some embodiments of this application, the temperature control module includes a heating subsystem and a cooling subsystem, both of which are connected to the temperature and humidity controller 100. With the above configuration, the temperature and humidity controller 100 can raise the temperature inside the sealed box 200 via the heating subsystem and lower the temperature inside the sealed box 200 via the cooling subsystem. The heating subsystem may include a nickel-chromium alloy electric heating element, and the cooling subsystem may include a compressor and an evaporator.

[0036] In some embodiments of this application, the humidity control module includes a humidification subsystem and a dehumidification subsystem, both of which are connected to the temperature and humidity controller 100. With the above settings, the temperature and humidity controller 100 can increase the humidity inside the sealed box 200 through the humidification subsystem and decrease the humidity inside the sealed box 200 through the dehumidification subsystem. The humidification subsystem may include a shallow-slot electrode humidifier, and the dehumidification subsystem may include an adsorption dehumidification device.

[0037] In some embodiments of this application, the temperature and humidity controller 100 can be a PLC controller. A PLC (Programmable Logic Controller) is a digital computing electronic system specifically designed for industrial environments. Based on the above settings, the measurement of material resistivity can be made more reliable.

[0038] like Figure 3 As shown, in some embodiments of this application, one embodiment of this application also provides a material resistivity measurement method, applied to the material resistivity measurement device of the above embodiments. The material resistivity measurement method may include, but is not limited to, the following steps: Step S100: The first electrode and the ring electrode are controlled to move away from the second electrode by the movement control module; Step S200: Place the material to be tested above the second electrode, close the sealed box, and control the temperature and humidity control modules to work according to the received temperature and humidity settings through the temperature and humidity controller. In step S300, when the ambient temperature and humidity in the sealed chamber both reach the set values, the first electrode and the ring electrode are controlled by the motion control module to move closer to the second electrode, and the first electrode and the ring electrode are made to fit in contact with the material to be tested. Step S400: According to the resistivity measurement type, the resistivity measurement process of the material to be measured is performed by adjusting the connection method of the first electrode, the ring electrode and the second electrode.

[0039] It should be noted that during the material resistivity measurement process, the first electrode and the ring electrode are first moved away from the second electrode by the motion control module. Next, the material to be tested is placed on top of the second electrode, and then the sealed chamber is closed to create a closed environment for the material, ensuring a constant temperature and humidity environment for subsequent measurements. Then, the temperature and humidity controller operates the temperature and humidity adjustment modules based on the received temperature and humidity settings. Once the ambient temperature and humidity in the sealed chamber reach the set values, the first electrode and the ring electrode are moved closer to the second electrode by the motion control module, ensuring they are in contact with the material to be tested, preparing for the subsequent resistivity measurement. Finally, the connection method of the first electrode, the second electrode, and the ring electrode can be adjusted according to the resistivity measurement type to perform the resistivity measurement on the material. By changing the connection method of the first electrode, the second electrode, and the ring electrode, the volume resistivity and surface resistivity of the material under test can be measured without moving the material under test in the sealed box. Furthermore, the material under test can be kept in a constant temperature and humidity environment during the measurement process, thereby realizing in-situ measurement of resistivity and rapid switching of measurement. This can greatly improve the authenticity, repeatability, and comparability of test results under different working conditions.

[0040] like Figure 4 As shown, in some embodiments of this application, the resistivity measurement of the material under test is performed by adjusting the connection method of the first electrode, the ring electrode, and the second electrode, depending on the resistivity measurement type. This may include, but is not limited to, the following steps: Step S410: When the resistivity measurement type is volume resistivity, control the second electrode to be connected to the measurement input voltage, the first electrode to be connected to the measurement output current, and the ring electrode to be connected to the reference ground to realize the volume resistivity measurement process. In step S420, when the resistivity measurement type is surface resistivity, the control loop electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the second electrode is connected to the reference ground to realize the surface resistivity measurement process.

[0041] It should be noted that, in the process of measuring the resistivity of the material under test by adjusting the connection methods of the first electrode, ring electrode, and second electrode according to the resistivity measurement type, when the resistivity measurement type is volume resistivity, the second electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the ring electrode is connected to the reference ground to achieve volume resistivity measurement; when the resistivity measurement type is surface resistivity, the ring electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the second electrode is connected to the reference ground to achieve surface resistivity measurement. By adjusting the connection methods of the first electrode, ring electrode, and second electrode, the resistivity measurement type can be switched easily and quickly, making the resistivity measurement process simpler and faster, and eliminating the need to move the material under test inside the sealed chamber, thus making the measurement more accurate.

[0042] It is worth noting that in the process of measuring the volume resistivity of the material under test, the main measurement is the volume resistance of the current flowing through the material. The ring electrode prevents the current on the surface of the material from passing through the measuring instrument and ensures a uniform electric field distribution under the first electrode. In the process of measuring the surface resistivity of the material under test, the ring electrode reduces the volume current to a level that does not affect the surface resistance measurement. Once the volume resistance and surface resistance are measured, the corresponding resistivity can be calculated using existing resistivity calculation algorithms, which will not be elaborated upon here.

[0043] The above is a detailed description of the preferred embodiments of this application. However, the embodiments of this application are not limited to the above-described implementation methods. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the embodiments of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of the embodiments of this application.

Claims

1. A material resistivity measuring device, characterized by, include: A constant temperature and humidity control system includes a temperature and humidity controller, an environmental monitoring module, a temperature regulation module, a humidity regulation module, and a sealed box. The environmental monitoring module, the temperature regulation module, and the humidity regulation module are all located inside the sealed box, and the environmental monitoring module, the temperature regulation module, and the humidity regulation module are all connected to the temperature and humidity controller. The three-electrode measurement system includes a first electrode, a ring electrode, a second electrode, and a movement control module. The first electrode and the ring electrode are both disposed above the second electrode and are concentrically arranged. Both the first electrode and the ring electrode are connected to the movement control module. The first electrode, the ring electrode, and the second electrode are all disposed inside the sealed box, and the outlets of the connecting wires of the first electrode, the ring electrode, and the second electrode are all disposed on the sealed box. The second electrode is used to place the material to be tested, and the first electrode and the ring electrode can move closer to or further away from each other under the control of the movement control module.

2. The material resistivity measuring apparatus according to claim 1, characterized by An insulating water-conducting platform is provided on at least one side of the second electrode; the top surface of the insulating water-conducting platform extends from top to bottom and is inclined away from the second electrode in the horizontal direction.

3. The material resistivity measuring apparatus according to claim 1, characterized by, The motion control module includes a servo driver, a servo motor, an encoder, and a transmission structure. The servo driver, the servo motor, and the transmission structure are connected in sequence. The encoder is used to monitor the status of the servo motor and is connected to the servo driver. The first electrode and the ring electrode are both connected to the transmission structure.

4. The material resistivity measuring apparatus according to claim 2, characterized by It also includes a measuring bracket, which is disposed inside the sealed box. The measuring bracket includes a placement platform and multiple support rods. The multiple support rods are disposed below the placement platform and are used to support the placement platform. The motion control module is disposed on the placement platform. The first electrode, the ring electrode, and the second electrode are all disposed below the placement platform. The insulated water guide platform is connected to the support rods.

5. The material resistivity measuring apparatus according to claim 1, wherein The environmental monitoring module includes a temperature sensor and a humidity sensor, both of which are connected to the temperature and humidity controller.

6. The material resistivity measuring device according to claim 1, characterized in that, The temperature control module includes a heating subsystem and a cooling subsystem, both of which are connected to the temperature and humidity controller.

7. The material resistivity measuring device according to claim 1, characterized in that, The humidity control module includes a humidification subsystem and a dehumidification subsystem, both of which are connected to the temperature and humidity controller.

8. The material resistivity measuring device according to claim 1, characterized in that, The temperature and humidity controller is a PLC controller.

9. A method for measuring the resistivity of a material, characterized in that, The material resistivity measuring device according to any one of claims 1 to 8, wherein the material resistivity measuring method comprises: The movement control module controls the first electrode and the ring electrode to move away from the second electrode; The material to be tested is placed above the second electrode, the sealed box is closed, and the temperature and humidity controller controls the temperature adjustment module and the humidity adjustment module to work according to the received temperature and humidity settings. When the ambient temperature and humidity in the sealed chamber both reach the set temperature and humidity values, the movement control module controls the first electrode and the ring electrode to move closer to the second electrode, so that the first electrode and the ring electrode are in contact with the material to be tested. Depending on the resistivity measurement type, the resistivity measurement of the material under test is performed by adjusting the connection method of the first electrode, the ring electrode, and the second electrode.

10. The method for measuring the resistivity of materials according to claim 9, characterized in that, The process of performing resistivity measurement on the material under test by adjusting the connection method of the first electrode, the ring electrode, and the second electrode according to the resistivity measurement type includes: When the resistivity measurement type is volume resistivity, the second electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the ring electrode is connected to the reference ground to realize the volume resistivity measurement process. When the resistivity measurement type is surface resistivity, the ring electrode is connected to the measurement input voltage, the first electrode is connected to the measurement output current, and the second electrode is connected to the reference ground to realize the surface resistivity measurement process.

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