A device and operating method for measuring the profile potential distribution of a buried pool.

Abstract

This invention relates to the field of water leakage detection technology, specifically a device and operating method for measuring the contour potential distribution of buried pools. The device includes a portable host, a positive transmitting electrode, a negative transmitting electrode, multiple receiving electrodes, a reference electrode, distributed receiving cables, and a transmitting cable. The portable host internally houses a receiver module, a transmitter module, a power supply module, and a communication module. The receiver module includes a multi-channel signal conditioning and acquisition circuit, a reference voltage source, and a standard resistor. Each channel includes a preamplifier circuit, a switching assembly, a bandpass filter, a power frequency bandstop filter, a programmable gain amplifier, and an analog-to-digital converter. This invention can automatically complete the measurement of grounding resistance, natural potential, DC potential, multi-frequency AC potential, and equivalent resistance in a single test, effectively solving the problems of existing technologies such as single measurement parameters, poor scene adaptability, and weak anti-interference capabilities.

Description

Technical Field

[0001] This invention relates to the field of water leakage detection technology, and in particular to a device and operating method for measuring the profile potential distribution of buried pools. Background Technology

[0002] Buried wastewater treatment ponds are typically completely or partially buried underground, usually constructed of concrete with an internal impermeable coating, and are primarily used for storing or treating various types of wastewater. Compared to large ponds such as reservoirs and canal embankments, buried wastewater treatment ponds, although smaller in size, pose a greater risk of pollution. After a certain period of operation, buried ponds will be susceptible to damage to varying degrees due to various factors, and leaking wastewater will damage the surrounding soil and groundwater along the pond. Therefore, timely detection of potential leaks in buried wastewater treatment ponds is crucial for prevention and protection. Conventional methods for detecting leaks in ponds are mostly based on physical quantities such as sound, light, electricity, magnetism, and temperature. Due to the shallow burial, small size, and high interference of buried wastewater treatment ponds, the sound, light, magnetism, and temperature physical quantities have weak leakage responses and poor resolution. Conventional methods such as ultrasound, fiber optics, transient electromagnetics, infrared, and ground-penetrating radar are no longer applicable. Potential detection methods based on low-frequency current fields are more suitable for detecting leaks in buried wastewater treatment ponds because of their flexible deployment and more sensitive response to the seepage path within the pond.

[0003] Existing current field-based methods include: "Concentrated Current Field Method for Dam Leakage Detection Instrument and Measurement Method" (CN1241718A), which only measures alternating potential at a certain frequency and requires navigation in water; "An Artificial Current Field Method for Defect and Leakage Detection of Waterstop Curtain and Diaphragm Wall Structures" (CN116046284A), used in the subway field, only measures DC potential and its test scenario is not applicable to buried pools; "Current Field Method for Leakage Detection Instrument of Foundation Pit Retaining Structure" (CN219157786U), used in the foundation pit field, has a test scenario and method that are not applicable to buried pools. Under increasingly complex electromagnetic and building environment constraints, existing methods all suffer from limitations in scene structure and limited test content during actual testing, and none of them can adequately meet the requirements of inversion algorithms. Summary of the Invention

[0004] To address the problems of existing detection methods, such as difficulty in deployment, limited measurement quantities, poor adaptability to different scenarios, weak response, and significant interference, this invention proposes a buried pool contour potential measurement device and operation method based on current field. This device enables accurate measurement of multiple physical quantities, including the pool contour natural potential, electrostatic potential, alternating potential, grounding resistance, and equivalent resistance. Combined with an inversion algorithm, it achieves the goal of accurately locating potential hazards in the pool.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of this invention discloses a device for measuring the profile potential distribution of a buried pool, comprising: A portable host computer internally includes a receiver module, a transmitter module, a power supply module, and a communication module. Both the positive and negative transmitting electrodes are copper electrodes, connected to the portable host computer via a transmitting cable. The positive transmitting electrode is placed inside the buried pool to contact the liquid within the pool, while the negative transmitting electrode is placed on the outer edge of the pool's contour. Multiple receiving electrodes are arranged at intervals along the survey lines of each contour surface of the buried pool. A reference electrode is placed at a predetermined distance from the buried pool and in contact with the ground. Distributed receiving cables connect the multiple receiving electrodes and the reference electrode to the receiver module. The receiver module includes a multi-channel signal conditioning and acquisition circuit, a reference voltage source, and a standard resistor. Each channel in the multi-channel signal conditioning and acquisition circuit includes a preamplifier circuit, a switching assembly, and a bandpass filter. The receiver module includes a power frequency bandstop filter, a programmable gain amplifier, and an analog-to-digital converter. The switching assembly is used to selectively connect the potential signal acquired by the receiving electrode and the standard voltage signal in the test circuit composed of the reference voltage source and the standard resistor to the preamplifier circuit, and to control the bandpass filter and power frequency bandstop filter to access the signal path during AC potential testing. The transmitter module includes a digital control circuit, a transmission signal source, a drive circuit, and an H-bridge power amplifier module. The digital control circuit is configured to control the transmission signal source to generate a DC signal or an AC signal of a preset frequency, and output it to the positive and negative transmitting electrodes through the drive circuit and the H-bridge power amplifier module. The communication module is used to establish a wireless communication connection between the host computer and the receiver module and transmitter module to transmit control commands and acquired data.

[0006] A second aspect of this invention discloses an operating method for a device for measuring the profile potential distribution of a buried pool, applicable to any of the devices described in the invention, comprising the following steps: Step 1: Place the positive transmitting electrode inside the buried pool and make it in contact with the liquid inside. Place the negative transmitting electrode outside the outline of the pool, with the line connecting it to the positive transmitting electrode perpendicular to the surface to be measured. Arrange multiple receiving electrodes at equal intervals along the first measurement line of the surface to be measured on the buried pool, close to the pool body. Place the reference electrode at a predetermined distance from the buried pool body and ensure it is in good contact with the ground. Connect each receiving electrode and the reference electrode to the portable host via distributed receiving cables. Connect the positive transmitting electrode and the negative transmitting electrode to the portable host via transmitting cables. After checking the correctness of the system connections, power on the device for self-test. Step 2: After the self-test is completed, set the receiving parameters. With the transmitter module not working, the receiver module measures the grounding resistance and channel drift of each receiving electrode through a loop consisting of a reference voltage source and a standard resistor. If the grounding resistance exceeds the threshold, the corresponding measuring point is subjected to resistance reduction measures and then measured again. Step 3: With the transmitter module continuously inactive, the receiver module switches to the natural potential channel, submits the receiver acquisition task, acquires the background field potential signal at each measurement point where the receiving electrode is located, performs spectrum analysis on the acquired signal, and determines the AC transmission frequencies f1 and f2 to avoid external interference based on the analysis results. Step 4: Set the transmitter module's transmission frequency to f1 and the empirical voltage, enable transmission, submit the acquisition task, and observe the data of each channel; confirm that the signal of each channel should be an AC signal of the set frequency and the amplitude should be within the preset range. If it exceeds the preset range, adjust the transmission voltage until the requirements are met. Step 5: After the status debugging is completed, submit the receiving electrode test task to the test line. The receiving electrode test task is executed in sequence according to the preset time sequence to measure the grounding resistance, natural potential, DC potential, AC potential at frequency f1, AC potential at frequency f2 and equivalent resistance. The acquisition, storage and transmission of each parameter are automatically completed under the control of a single command. Step 6: After completing the measurement of the current measurement line, move the multiple receiving electrodes backward a predetermined distance to form the next measurement line. Repeat steps 2 to 5 until all three measurement lines of the contour surface have been tested. Step 7: Repeat steps 1 to 6 to complete the potential test of the remaining measurable contour surfaces of the buried pool. Step 8: After all tests are completed, check the data quality using preprocessing software. If there are any missed or abnormal test points, rearrange the receiving electrodes at the missed or abnormal test points and repeat steps 2 to 5 for supplementary testing until the data quality is qualified. Send the final data to the interpreter, and the test is over.

[0007] This invention addresses the technical deficiencies in the prior art and has the following beneficial effects: It employs a portable transceiver device and distributed cables, allowing the receiving electrode to be conveniently positioned outside the pool's outline, and a small transmitting positive electrode to be rationally positioned within the pool, significantly improving scenario adaptability. Without requiring additional design, it achieves measurements of natural potential, electrostatic potential, alternating potential, grounding resistance, and equivalent resistance, enriching the inversion parameters and avoiding interference and layout risks introduced by different electromagnetic and building environments. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0009] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a timing diagram for the test of the present invention; Figure 3 This is a diagram showing the composition of the transmitting module of the present invention; Figure 4 This is a schematic diagram of the power amplifier circuit operation of the present invention; Figure 5 This is a schematic diagram of the power module of the present invention; Figure 6 This is a schematic diagram of the communication module operation of the present invention; Figure 7 This is a flowchart of the device operation method of the present invention; In the diagram: 1 is the buried pool; 2 is the receiving electrode; 3 is the position of the receiving electrode to be measured; 4 is the transmitting positive electrode; 5 is the transmitting negative electrode; 6 is the reference electrode; 7 is the distributed receiving cable; 8 is the transmitting cable; 9 is the portable host; 91 is the receiver module; 92 is the transmitter module; 93 is the power supply module; 94 is the communication module. Detailed Implementation

[0010] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0011] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0012] like Figure 1 As shown, the first aspect of the present invention discloses an apparatus for measuring the profile potential distribution of a buried pool body 1, comprising: A portable host 9 internally includes a receiver module 91, a transmitter module 92, a power supply module 93, and a communication module 94. A positive transmitting electrode 4 and a negative transmitting electrode 5, both copper electrodes, are connected to the portable host 9 via a transmitting cable 8. The positive transmitting electrode 4 is placed inside the buried pool 1 to contact the liquid within the pool, while the negative transmitting electrode 5 is placed on the outer edge of the pool's contour. Multiple receiving electrodes 2 are arranged at intervals along the measuring lines of each contour surface of the buried pool 1. A reference electrode 6 is placed at a predetermined distance from the buried pool 1 and in contact with the ground. A distributed receiving cable 7 connects the multiple receiving electrodes 2 and the reference electrode 6 to the receiver module 91. The receiver module 91 includes a multi-channel signal conditioning and acquisition circuit, a reference voltage source, and a standard resistor. Each channel includes a preamplifier circuit, a switching assembly, and a bandpass filter. The receiver module 91 comprises a receiver module 92, a power frequency bandstop filter, a programmable gain amplifier, and an analog-to-digital converter. The switching assembly is used to selectively connect the potential signal acquired by the receiving electrode 2 and the standard voltage signal in the test circuit composed of the reference voltage source and the standard resistor to the preamplifier circuit, and to control the bandpass filter and the power frequency bandstop filter to access the signal path during AC potential testing. The transmitter module 92 includes a digital control circuit, a transmitting signal source, a drive circuit, and an H-bridge power amplifier module. The digital control circuit is configured to control the transmitting signal source to generate a DC signal or an AC signal of a preset frequency, and output it to the positive transmitting electrode 4 and the negative transmitting electrode 5 through the drive circuit and the power amplifier module. The communication module 94 is used to establish a wireless communication connection between the host computer and the receiver module 91 and the transmitter module 92 to transmit control commands and acquired data. The bandpass filter is a Butterworth type bandpass filter with a passband frequency of 2.5Hz to 250Hz; the power frequency bandstop filter adopts a double quadratic form to suppress frequencies of 50Hz and 150Hz. The analog-to-digital converter (ADC) is either 24-bit or 32-bit, with a 32-bit ADC used to improve resolution when the signal frequency is below 1kHz. The H-bridge power amplifier module uses MOSFETs as its switching devices, with a withstand voltage of at least 600V and a rated current of at least 20A. The programmable gain amplifier consists of a first-level gain and a second-level gain combination. The first-level gain is 1, 2, 4, or 8 times, and the second-level gain is 1, 10, 100, or 1000 times, achieving 16 gain ratios through combination. The power supply module 93 includes an AC / DC converter, a rechargeable lithium battery, a charger, and a programmable power supply. When external AC power is connected, the AC / DC converter outputs DC power and charges the lithium battery through the charger, while simultaneously supplying power to the system. When there is no AC power, the lithium battery provides power. The programmable power supply is used to provide isolated power to each module.

[0013] It should be noted that the working process of this invention is as follows: the positive transmitting electrode 4 is placed in the buried pool 1 and in contact with the liquid inside the pool; the negative transmitting electrode 5 is placed at a distance outside the outline of the pool to be tested, and the line connecting the positive transmitting electrode 4 and the outline surface to be tested is perpendicular to the outline surface and centered as much as possible; each outline surface of the buried pool 1 needs to be tested with 3 test lines. Taking the first test line as an example, the receiving electrode 2 should be as close as possible to the pool, and the electrode array should be placed at equal intervals, generally 1m or 0.5m apart. For micro-pools, the interval can be 0.5m; the array of receiving electrodes 2 is connected to the portable host 9 through a distributed receiving cable 7; the reference electrode 6 should be placed at a distance of 1.5m or more from the buried pool, and should be watered to ensure good contact with the soil. Its contact condition directly affects the grounding resistance measurement.

[0014] After the device is set up, the grounding resistance is measured first according to the working settings. The grounding resistance reflects the contact between each receiving measurement point and the ground surface outside the outline of the buried pool 1. During the measurement, the transmitter module 92 is not working, and the receiver measures the contact resistance at each point through a reference voltage and standard circuit. Grounding resistance within 5000Ω can be tested directly; if it is greater than 5000Ω, the value should be reduced by watering, applying conductive material, or mud. After that, the transmitter module 92 is still not working, and the receiver module 91 switches to the natural potential channel to collect the background field potential signal for 1 to 4 seconds. This process has two purposes: first, to collect the natural potential and environmental noise at each frequency point; and second, to analyze the strong interference frequency points through the host software and set the transmission frequency point with less interference accordingly. After the natural potential measurement is completed, the transmitter module 92 switches to DC mode, adjusts the transmission voltage to ensure that the analog-to-digital converter (ADC) of the receiver module is in the optimal dynamic range, and then the receiver module measures the DC potential of each receiving point through the ADC. At the same time, the system records the transmission voltage and current as the DC equivalent resistance of the contour surface of the buried pool body 1. After the DC potential measurement is completed, the transmitter module 92 switches to AC mode, sets the transmission frequency f1, adjusts the transmission voltage to ensure that the ADC of the receiver module 91 is in the optimal dynamic range, and then the receiver module 91 measures the DC potential of each receiving point through the ADC and calculates its amplitude through phase-sensitive detection and other algorithms. At the same time, the system records the transmission voltage and current as the AC equivalent resistance of the contour surface of the buried pool body 1. The transmission frequency is changed to f2, and the f1 measurement process is repeated. Generally, measuring two alternating frequencies is sufficient.

[0015] like Figure 2The test timing diagram shown illustrates that the measurement process is automatically completed within the device host via digital circuits such as microcontrollers, DSPs, or FPGAs, requiring no manual operation. The digital circuit design process is easily understood by those skilled in the art and will not be described further. After the first test line is completed, the second test line involves moving the entire array of receiving electrodes 2 backward by 0.5m or 1m and repeating the above process. The third test line is similar. After measuring a certain contour surface, the above process is repeated to test the potential of other contour surfaces. In reality, some contour surfaces of the buried pool 1 are not suitable for testing due to building or ditch limitations. In such cases, analysis can only be performed based on the measurable contour potential data.

[0016] The receiver module 91, transmitter module 92, power supply module 93, and communication module 94 inside the portable host of the measuring device of the present invention can be designed as an integrated unit or as a receiver host + transmitter host. The specific schemes of each module are as follows.

[0017] 1) Receiver module 91 The receiver module 91 internally consists of a multi-channel (8 or 16 channels) signal conditioning and acquisition circuit. Each channel of the multi-channel signal conditioning and acquisition circuit comprises a preamplifier circuit, a switching assembly, a selectable bandpass filter, a selectable power frequency bandstop filter, a programmable gain amplifier, and an analog-to-digital converter (ADC). The preamplifier circuit uses an instrumentation amplifier circuit; the switching assembly uses a relay or analog switch; the bandpass filter has a bandwidth of 2.5Hz to 250Hz and is of Butterworth type; the power frequency bandstop filter uses a dual-quadratic design for fixed-frequency suppression at 50Hz and 150Hz; the programmable gain amplifier is controlled by digital I / O circuits, with gain combinations of the first level (1, 2, 4, 8 times) and the second level (1, 10, 100, 1000 times), enabling 16 gain ratio switching options; the ADC is 24-bit or 32-bit, with a 32-bit ADC used for signals below 1kHz to improve resolution; the ADC uses a 4-channel or 8-channel configuration, with a single-channel configuration used when channel crosstalk is high.

[0018] Receiver module 91 is connected to each receiving electrode 2 via distributed receiving cable 7, and the electrodes respond to various potential signals. The state of the input potential signal of each channel is obtained by changing the operating state of transmitter module 92. Specifically: when performing grounding resistance testing, transmitter module 92 is in the off state, and the switching component connects the standard voltage signal in the test circuit composed of the reference voltage source and the standard resistor to the preamplifier circuit. At this time, the filter switching contact in the switching component is in the pass-through state, and the bandpass filter and power frequency bandstop filter are not connected. The gain can be manually adjusted or the dynamic automatic gain can be sampled for the analog-to-digital converter to sample. When performing natural potential testing, transmitter module 92 is in the off state, and the switching component connects the potential signal collected by receiving electrode 2 to the preamplifier circuit. At this time, the filter switching contact is in the pass-through state, and the filter is not connected. After sampling, FFT spectrum analysis is performed on the data, and AC transmission frequencies f1 and f2 that avoid external interference are selected based on the analysis results. When performing DC potential testing, transmitter module 92 switches to DC output mode, and the switching component connects the standard voltage signal in the test circuit composed of the reference voltage source and the standard voltage signal in the test circuit to the preamplifier circuit. At this time, the filter switching contact is in the pass-through state, and the filter is not connected. After sampling, FFT spectrum analysis is performed on the data, and AC transmission frequencies f1 and f2 that avoid external interference are selected based on the analysis results. The potential signal collected by receiving electrode 2 is connected to the preamplifier circuit. At this time, the filter switching contact is in the pass-through state and the filter is not connected. When performing AC potential testing at frequency f1, the transmitter module 92 switches to AC output mode and the transmission frequency is set to f1. The switching component connects the potential signal collected by receiving electrode 2 to the preamplifier circuit. At the same time, the filter switching contact in the switching component connects the bandpass filter to the signal path. The power frequency bandstop filter is connected depending on the level of power frequency interference. When performing AC potential testing at frequency f2, the transmitter module 92 switches to AC output mode and the transmission frequency is set to f2. The switching component connects the potential signal collected by receiving electrode 2 to the preamplifier circuit. At the same time, the filter switching contact in the switching component connects the bandpass filter to the signal path. The power frequency bandstop filter is connected depending on the level of power frequency interference. When measuring the above signals, the analog-to-digital converter simultaneously acquires the data and transmits it to the host computer through the communication module 94. The acquisition, storage, and transmission of the above five parameters are all automatically completed under the control of a single command.

[0019] 2) Transmitter Module 92 like Figure 3As shown, the transmitting circuit module consists of a digital control circuit, a transmitting signal source, a driving circuit, and a power amplifier module. The digital control circuit uses a microcontroller, DSP, or FPGA chip. During operation, the control unit sets the frequency of the temperature-controlled crystal oscillator through direct digital frequency synthesis to generate the transmitting signal source based on telemetry commands. The driving circuit uses an optocoupler-isolated bootstrap voltage boosting method to convert the output of the transmitting signal into a pair of complementary signals as the logic input of the driving chip, realizing the switching control of the power amplifier module. The power amplifier module connects to the transmitting DC high voltage and the transmitting positive electrode 4 and transmitting negative electrode 5, realizing AC / DC excitation of the transmitting positive electrode 4 and transmitting negative electrode 5 under the control of the driving circuit. The transmitter module 92 simultaneously measures the transmitting voltage and current, realizing the calculation of the equivalent resistance of the buried pool body 1.

[0020] like Figure 4 As shown, the transmitting power circuit is an H-type full-bridge configuration. Based on the comprehensive requirements of the buried pool 1 site and the influence of the geological strata, the power amplifier module switches in the power circuit should meet the requirements of a withstand voltage ≥ 600V and a rated current ≥ 20A. Considering the derating of the switching transistors, the actual switch selection principle is: selecting based on the maximum withstand voltage and rated current while meeting structural constraints, and taking into account the turn-on and turn-off delay times. To minimize the impact of tail current on the transmitting switch, MOSFETs are selected. The transmitting module is powered on during DC and AC potential tests; otherwise, it is disabled. During DC transmission, switches A and D are always in the ON state, and switches B and C are always in the OFF state. The current flow is: DC → switch A → positive transmitting electrode 4 → buried pool 1 → negative transmitting electrode 5 → switch D → GND. During AC transmission, under a 50% duty cycle control pulse at a certain frequency, when switches A and D are on during the positive duty cycle, switches B and C are off. The current flow is: DC → switch A → positive transmitting electrode 4 → buried pool 1 → negative transmitting electrode 5 → switch D → GND. During the negative duty cycle, the current flow is: DC → switch C → negative transmitting electrode 5 → buried pool 1 → positive transmitting electrode 4 → switch D → GND. This achieves AC excitation of positive transmitting electrode 4 and negative transmitting electrode 5. The four switches alternately turn on and off at a predetermined frequency to achieve AC excitation of positive transmitting electrode 4 and negative transmitting electrode 5.

[0021] 3) Power module 93 like Figure 5The diagram shows the power module 93. The device can be powered by an external 220VAC AC power supply or an internal 42V 20AH lithium battery. The internal lithium battery is connected to the system's DC bus via a push-button switch, providing self-test power when there is no AC bus input. When the AC bus is connected, the AC / DC module outputs 42VDC. Due to the presence of diodes, the battery is clamped and no longer supplies power to the DC bus. At this time, the AC bus charges the battery through the built-in charger. The programmable power supply within the power module 93 can operate via either the AC bus or the DC bus. Other circuits within the device are powered via AC / DC + isolated DC / DC mode.

[0022] 4) Communication Module 94 like Figure 6 The diagram shows the device's communication connection. Communication module 94 establishes a Wi-Fi network to enable communication and control between the host computer and the transmitting and receiving modules. The host computer can be a mobile phone, computer, or portable tablet, communicating with communication module 94 via TCP / IP or UDP protocols. Communication module 94 communicates with the transceiver modules via a CAN bus. Communication module 94 is configured as a hotspot (AP, server), and the host computer is configured as a slave. Before operation, the device must be powered on. Only after communication module 94 establishes the network and successfully connects to the host computer can the system be controlled via software. During operation, communication module 94 automatically converts the network frame data format sent by the host computer software into CAN bus format and sends it to the transceiver modules. Simultaneously, it automatically converts the CAN frames received from the transceiver modules on the CAN bus into UDP frames and uploads them to the host computer software. Given the large amount of data uploaded by the transceiver modules and the large number of channels, the communication rate during operation should be carefully considered.

[0023] A second aspect of this invention discloses an operating method for a device for measuring the profile potential distribution of a buried pool, applicable to any of the devices described in the invention, comprising the following steps: Step 1: Place the positive transmitting electrode inside the buried pool and make it in contact with the liquid inside. Place the negative transmitting electrode outside the outline of the pool, with the line connecting it to the positive transmitting electrode perpendicular to the surface to be measured. Arrange multiple receiving electrodes at equal intervals along the first measurement line of the surface to be measured on the buried pool, close to the pool body. Place the reference electrode at a predetermined distance from the buried pool body and ensure it is in good contact with the ground. Connect each receiving electrode and the reference electrode to the portable host via distributed receiving cables. Connect the positive transmitting electrode and the negative transmitting electrode to the portable host via transmitting cables. After checking the correctness of the system connections, power on the device for self-test. Step 2: After the self-test is completed, set the receiving parameters. With the transmitter module not working, the receiver module measures the grounding resistance and channel drift of each receiving electrode through a loop consisting of a reference voltage source and a standard resistor. If the grounding resistance exceeds the threshold, the corresponding measuring point is subjected to resistance reduction measures and then measured again. Step 3: With the transmitter module continuously inactive, the receiver module switches to the natural potential channel, submits the receiver acquisition task, acquires the background field potential signal at each measurement point where the receiving electrode is located, performs spectrum analysis on the acquired signal, and determines the AC transmission frequencies f1 and f2 to avoid external interference based on the analysis results. Step 4: Set the transmitter module's transmission frequency to f1 and the preset initial transmission voltage, enable transmission, submit the acquisition task, and observe the data of each channel; confirm that the signal of each channel should be an AC signal of the set frequency and the amplitude should be within the preset range. If it exceeds the preset range, adjust the transmission voltage until the requirements are met. Step 5: After the status debugging is completed, submit the receiving electrode test task to the test line. The receiving electrode test task is executed in sequence according to the preset time sequence to measure the grounding resistance, natural potential, DC potential, AC potential at frequency f1, AC potential at frequency f2 and equivalent resistance. The acquisition, storage and transmission of each parameter are automatically completed under the control of a single command. Step 6: After completing the measurement of the current measurement line, move the multiple receiving electrodes backward a predetermined distance to form the next measurement line. Repeat steps 2 to 5 until all three measurement lines of the contour surface have been tested. Step 7: Repeat steps 1 to 6 to complete the potential test of the remaining measurable contour surfaces of the buried pool. Step 8: After all tests are completed, check the data quality using preprocessing software. If there are any missed or abnormal test points, rearrange the receiving electrodes at the missed or abnormal test points and repeat steps 2 to 5 for supplementary testing until the data quality is qualified. Send the final data to the interpreter, and the test is over.

[0024] In step one, the multiple receiving electrodes are arranged at equal intervals of 1m or 0.5m along the first measuring line; in step six, the receiving electrodes are moved backward by a predetermined distance of 0.5m or 1m.

[0025] The threshold value of the grounding resistance mentioned in step two is 5000Ω, and the resistance reduction measures include watering, applying conductive material, or applying mud.

[0026] The preset range mentioned in step four is 50mV to 1000mV; when measuring DC and AC potentials in step five, the transmit voltage is adjusted based on the principle that the analog-to-digital converter of the receiver module is in the optimal dynamic range; when measuring AC potentials, it is determined whether to connect the power frequency bandstop filter to the signal path according to the power frequency environment.

[0027] It should be noted that the flowchart of the operation method of this device is as follows: Figure 7 As shown, the specific operation process is described below: 1) System according to Figure 1 Connect the system cables and check that the system connections are correct; 2) After the correctness check is completed, the system performs a self-test upon startup; 3) After the self-test is completed, set the receiving parameters and test the grounding resistance and channel drift; 4) Do not transmit for now. Submit the receiver acquisition task to test the ambient natural potential and determine the optimal operating frequency. 5) Set the transmitter frequency and empirical voltage, enable transmission, submit the acquisition task, and observe the data of each channel. Each channel should be a square wave f1 at the set frequency, and the amplitude should be between 50mV and 1000mV. If it exceeds the range, increase or decrease the transmission voltage appropriately. 6) After the transmission voltage, transmission frequency, channel acquisition, and other status adjustments are completed, submit the L1 measuring line receiving electrode test task (grounding resistance, natural potential, DC potential, AC potential 1, AC potential 2, and equivalent resistance are calculated according to...). Figure 2 (The timing is done together) 7) Once the L1 section of the test line is completed, replace the receiving cable with the receiving electrode of the L2 test line and submit the L2 test line receiving electrode test task. 8) After the L2 section of the test line is completed, replace the receiving cable with the receiving electrode of the L3 test line and submit the L3 test line receiving electrode test task. 9) After the L3 section of the test line is completed, check whether all tests have been completed. If not, place the receiving electrode in the new test section and repeat cycles 6 to 9. 10) After all tests are completed, check the data quality using preprocessing software. If there are any missed test points or abnormal quality test points, place the receiving electrode at the missed test points or abnormal quality test points and repeat the cycle 6 to 10 times. 11) Send the data to the interpreter, and the test is complete.

[0028] In practical applications, this method also includes: The time-domain AC potential signal sequence of each receiving electrode at the transmission frequencies f1 and f2 is acquired. The same frequency reference signal generated by the transmitter module is used as the reference. The time-domain signal of each channel is subjected to quadrature phase-sensitive detection demodulation processing. The in-phase potential component and quadrature potential component of each receiving electrode at each transmission frequency are extracted. At the same time, the residual quadrature leakage amplitude of the in-phase channel and the quadrature channel during the demodulation process is recorded. For the same receiving electrode, the residual quadrature leakage amplitude is used as the demodulation confidence criterion to remove measurement point data whose residual quadrature leakage amplitude exceeds the demodulation lockout threshold; for the retained measurement points, the in-phase component and quadrature component at frequency f1 are used to form the first complex potential vector, and the in-phase component and quadrature component at frequency f2 are used to form the second complex potential vector. Calculate the vector endpoint deviation between the first complex potential vector and the second complex potential vector, wherein the vector endpoint deviation is the ratio of the Euclidean distance between the two complex potential vectors on the complex plane to the average amplitude of the two vectors; use the vector endpoint deviation as the complex potential dispersion response factor of the measuring point; Along the current measurement line direction, the spatial envelope of the complex potential dispersion response factor sequence is extracted, and the upper and lower envelopes of the sequence are fitted respectively. The envelope opening of the upper and lower envelopes at each measurement point is calculated. The gradient of the change of the envelope opening along the measurement line direction is used as the spatial distortion index of the complex potential dispersion response factor. Using the starting point of the survey line as a reference, the absolute value of the spatial distortion index is accumulated point by point to construct the cumulative distortion curve of the survey line; the cumulative distortion curve is subjected to piecewise linear fitting, and the node position where the slope of the adjacent piecewise fitted line is reversed and the reversal amplitude exceeds the reversal criterion is identified as the location of the discontinuous interface of the dielectric electrical structure. The identified discontinuous interface locations are projected back onto the spatial coordinates of the pool body contour surface corresponding to the measurement line. Based on the difference in the mean value of the complex potential dispersion response factor of each measurement point on both sides of the discontinuous interface location, the electrical transition type of the discontinuous interface is determined. The electrical transition type includes at least a low-resistivity intrusion interface and a high-blocking fault interface.

[0029] The in-phase potential component and quadrature potential component refer to two mutually orthogonal signal components obtained after orthogonal phase-sensitive detection demodulation of the time-domain AC potential signal collected by the receiving electrodes, using the same-frequency reference signal generated by the transmitter module as a reference. The part in phase with the reference signal is the in-phase potential component, and the part orthogonal to the reference signal is the quadrature potential component. The residual quadrature leakage amplitude refers to the leakage signal amplitude remaining in the orthogonal channel under ideal demodulation conditions, where the orthogonal channel should have zero output, due to non-ideal circuit characteristics or signal distortion.

[0030] It should be noted that the difficulty in detecting leakage in buried pools lies in the fact that minor damage to the pool structure in the early stages of leakage often does not cause significant changes in potential amplitude. Instead, it initially manifests as a non-uniform change in the electrical structure of the local medium. This change is easily masked by background noise in single-frequency AC potential measurements, especially when the electrical difference between the leakage channel and the surrounding soil is not significant. Conventional amplitude or resistivity analysis methods often cannot effectively distinguish between normal and slightly damaged media. To address this, this method utilizes the difference in medium response characteristics at two transmission frequencies to amplify this subtle change, thereby achieving high-sensitivity identification of the discontinuous interface of the electrical structure of the medium outside the pool outline. Specifically, when the residual orthogonal leakage amplitude at a certain measuring point exceeds a preset demodulation lockout threshold, it indicates that the demodulation result at that measuring point is unreliable and is discarded, thus ensuring that subsequent analysis is based only on high-quality data. For the retained measuring points, the in-phase and quadrature components at frequency f1 are combined into a first complex potential vector, and the in-phase and quadrature components at frequency f2 are combined into a second complex potential vector. A complex potential vector is a two-dimensional vector consisting of in-phase components as the real part and quadrature components as the imaginary part. It characterizes the complete potential response of a medium under excitation at a certain frequency. The difference in the position of the complex potential vector on the complex plane at two frequencies directly reflects the difference in the medium's response to excitation at different frequencies, i.e., its dispersion characteristics.

[0031] Based on this, the vector endpoint deviation between the first and second complex potential vectors is calculated and used as the complex potential dispersion response factor at that measurement point. The vector endpoint deviation is defined as the ratio of the Euclidean distance between the two complex potential vectors on the complex plane to the mean amplitude of the two vectors. The significance of using the ratio form is to eliminate the influence of absolute amplitude differences on the discrimination result, making the factor more focused on characterizing the changes in the dispersion characteristics of the medium. The complex potential dispersion response factors of each measurement point arranged along the measurement line constitute a spatial sequence. For a homogeneous and continuous medium, the sequence shows a gradual change within a certain spatial range; however, when there is a sudden change in the electrical structure in the medium, the sequence will show significant fluctuations near the change location. By extracting the spatial envelope of the sequence, i.e., fitting the upper and lower envelopes of the sequence respectively, the difference between the two at each measurement point is calculated as the envelope opening, and the gradient of the envelope opening along the measurement line is defined as the spatial distortion index. Since the envelope opening has an amplifying effect on the local fluctuations of the sequence, the spatial distortion index can reflect the discontinuity of the electrical structure of the medium more sensitively than directly using the original sequence.

[0032] Using the starting point of the measurement line as a reference, the absolute value of the spatial distortion index is accumulated point by point to construct a cumulative distortion curve. The physical meaning of the curve is that in regions where the dielectric electrical properties are continuous, the spatial distortion index is close to zero, and the cumulative distortion curve appears as a straight line with a constant slope; while at interfaces where the dielectric electrical structure undergoes abrupt changes, the spatial distortion index shows a peak, and the cumulative distortion curve shows a corresponding inflection point. By performing piecewise linear fitting on the cumulative distortion curve, the node positions where the slopes of adjacent piecewise fitted lines reverse sign and the reversal amplitude exceeds the reversal criterion can be accurately identified, thus accurately identifying the location of the discontinuous interface in the dielectric electrical structure. The advantage of this identification method is that it transforms discrete anomalies into the inflection characteristics of a continuous curve, effectively reducing misjudgments caused by random noise. By projecting the identified discontinuous interface position back onto the spatial coordinates of the pool contour surface corresponding to the measurement line, the anomaly position can be located in physical space. Furthermore, based on the direction of the difference in the mean value of the complex potential dispersion response factor at each measurement point on both sides of the discontinuous interface position, the electrical transition type of the interface can be determined, i.e., the nature of the difference in dielectric electrical properties on both sides of the interface. This method distinguishes at least two types: low-resistivity intrusion interfaces, characterized by a transition from a high-resistivity medium to a low-resistivity medium, typically corresponding to an increase in local conductivity caused by the intrusion of leaking liquid; and high-resistivity fault interfaces, characterized by a transition from a low-resistivity medium to a high-resistivity medium, typically corresponding to void interfaces formed by fractures or voids in concrete structures, providing a basis for subsequent leakage cause identification. Overall, this method can extract medium dispersion characteristics from multi-frequency AC potential data, locate discontinuous interfaces in electrical structures, and determine their transition types, thereby improving the sensitivity and accuracy of detecting potential leakage hazards in buried pools.

[0033] In practical applications, this method also includes: The equivalent resistance values ​​recorded at the same measuring point location for the same receiving electrode, when the transmitter module operates successively in DC mode and AC mode at frequencies f1 and f2, are obtained. These values ​​include the DC equivalent resistance, the AC equivalent resistance at frequency f1, and the AC equivalent resistance at frequency f2. The DC equivalent resistance is used as the static field apparent resistivity of the corresponding measuring point, and the AC equivalent resistance at each frequency is used as the dynamic field apparent resistivity of the corresponding frequency at the corresponding measuring point. For the receiving electrode, calculate the first dispersion modulus of the dynamic field-state apparent resistivity and the static field-state apparent resistivity at frequency f1, and the second dispersion modulus of the dynamic field-state apparent resistivity and the static field-state apparent resistivity at frequency f2; and construct the dispersion polarization characteristic ratio pair of the measurement point by using the first dispersion modulus and the second dispersion modulus. The dispersion polarization characteristic ratio pairs are compared with a pre-constructed spatial partitioning template of the induced polarization phase of the surrounding rock medium of the buried pool. The induced polarization phase spatial partitioning template includes a compact domain of dispersion polarization characteristics of low-permeability concrete matrix, a diffuse domain of dispersion polarization characteristics of water-bearing undisturbed soil layer, and a drift domain of dispersion polarization characteristics of permeable and disturbed medium. The medium induced polarization identification code is determined according to the membership probability of the dispersion polarization characteristic ratio pairs of the measuring point in each domain. Using the first dispersion modulus as the horizontal axis and the second dispersion modulus as the vertical axis in the dispersion polarization characteristic ratio pair, a phase trajectory projection point of the measuring point in the induced polarization phase space coordinate system is constructed; the Mahalanobis distance between the phase trajectory projection point and the center point of the dispersion polarization characteristic drift domain of the leakage disturbance medium is calculated, and the Mahalanobis distance is normalized to obtain the induced polarization phase space drift degree of the measuring point, and the induced polarization phase space drift degree is used as the leakage polarization response factor; Along the current measurement line direction, the leakage polarization response factors of each measurement point are arranged sequentially to form a medium polarization sensitive difference sequence; the medium polarization sensitive difference sequence is subjected to sliding window envelope demodulation, the upper envelope of the leakage polarization response factors within the sliding window is extracted, and the differential abrupt change amplitude of the upper envelope at the boundary of the sliding window is calculated; the region within the window where the differential abrupt change amplitude exceeds the polarization disturbance threshold is marked as the polarization disturbance front zone; The homology verification of the dielectric induced polarization identification codes of each measuring point within the polarization disturbance leading zone is performed, and measuring points whose dielectric induced polarization identification codes do not belong to the codes corresponding to the leakage disturbance medium are eliminated; the closed envelope segment formed by the continuous measuring points that pass the homology verification is determined as the abnormal leakage polarization response domain of the medium outside the pool contour.

[0034] It should be noted that existing current-field-based detection methods typically use the absolute value of the measured potential or apparent resistivity to infer changes in the conductivity of the medium, thereby determining whether leakage exists. In practice, it has been found that in shallow, heterogeneous environments such as buried ponds containing various artificial filler media, the absolute value of the apparent resistivity measured in a single instance is greatly affected by on-site factors such as seasonal humidity and grounding conditions. A single resistivity threshold is insufficient to accurately distinguish between background disturbances and actual leakage. Furthermore, simple DC or AC measurements cannot characterize the "attenuation" or "dispersion" features of the medium after polarization, and these features are often more sensitive to structural changes in solid-liquid two-phase media like leakage channels. To isolate the medium characteristics directly related to leakage from the complex background, this method first uses the DC equivalent resistance measured under DC excitation as the static field apparent resistivity, because the DC field does not involve the capacitive coupling and polarization response of the medium, reflecting the most basic conductive path of the medium. The AC equivalent resistance measured under AC excitation at frequencies f1 and f2 is defined as the dynamic field apparent resistivity. Under AC excitation, the medium includes not only conduction current but also the contributions of displacement current and excitation polarization effects. Specifically, when calculating the first dispersion modulus: subtract the static field apparent resistivity from the dynamic field apparent resistivity at frequency f1, and divide the difference by the static field apparent resistivity. This dimensionless ratio is the first dispersion modulus. The calculation of the second dispersion modulus is similar; simply replace the value corresponding to frequency f1 with the value at frequency f2. The physical significance of this is that the dispersion modulus quantitatively characterizes the degree of deviation of the medium's total current response from a pure DC conduction reference at a specific frequency. The stronger the polarization effect at the solid-liquid interface within the medium (such as the ion double-layer distortion formed by the interaction of clay minerals and sewage in a seepage channel), the larger the absolute value of the dispersion modulus tends to be.

[0035] Then, the dispersion polarization characteristic ratios are compared with a pre-constructed induced polarization phase space partitioning template of the surrounding rock medium in the buried pool. This partitioning template needs to be established in advance through background investigation and sample testing before implementing this method. In layman's terms, this template is equivalent to a dictionary calibrated through a large number of field measurements and theoretical forward modeling. The zoning template specifically includes three distribution domains with clear physical meanings: First, the "compact domain of dispersion polarization characteristics of low-permeability concrete matrix," which represents intact pool bodies or solidified soil layers with dense structures, extremely low porosity, and weak polarization effects, where the dispersion polarization characteristic ratio pairs are clustered within a very compact range in the induced polarization phase space; second, the "diffuse domain of dispersion polarization characteristics of undisturbed water-bearing soil layers," which represents original aquifers or backfill soils unaffected by leakage sewage. Due to the influence of their own particle sorting and differences in water content, the distribution of this domain is relatively diffuse, but it is still within a stable natural background range; third, the "drift domain of dispersion polarization characteristics of leakage-disturbed media," which represents media that have been modified by leakage sewage. Due to abnormal ion concentrations in the sewage and changes in the pore structure of the media, the dispersion polarization characteristic ratio pairs will "drift" out of the normal background domain.

[0036] By calculating the membership probability of the ratio of the measured points falling into the aforementioned domains, a medium induced polarization (IP) identification code is assigned to the measured points, thus realizing the transformation from fuzzy numerical comparison to clear classification of medium physical properties. After determining the medium properties, each measured point is projected onto the IPI phase space coordinate system with the first dispersion modulus as the horizontal axis and the second dispersion modulus as the vertical axis. The Mahalanobis distance between the projected point and the center point of the leakage disturbance medium drift domain is further calculated. After normalizing the calculated Mahalanobis distance, the final IPI phase space drift degree is obtained to reflect the degree of deviation of the medium characteristics of the measured point from the baseline of the intact medium, and the influence of dimensions and distribution scale is eliminated. After constructing a medium polarization sensitive difference sequence along the measurement line, the polarization disturbance front zone can be locked by performing sliding window envelope demodulation on the sequence. These front zones are often the places where the leakage boundary effect is most obvious. Finally, through homology verification, false anomalies caused by interference such as local metal foreign objects are eliminated, and a reliable abnormal leakage polarization response domain is finally delineated. In summary, this method, starting from the mechanism of the change of medium physical properties with frequency, combined with multidimensional discrimination and probability mapping of induced polarization phase space, effectively reduces the false anomaly interference caused by shallow inhomogeneities, so as to achieve accurate detection of leakage hazards under strong background noise.

[0037] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for measuring the potential distribution of a buried tank profile, characterized in that, include: The portable host computer has a receiver module, a transmitter module, a power supply module and a communication module inside. Both the positive and negative transmitting electrodes are copper electrodes, which are connected to the portable host via a transmitting cable; the positive transmitting electrode is placed inside the buried pool to contact the liquid inside the pool, and the negative transmitting electrode is placed outside the outline of the pool. Multiple receiving electrodes are arranged at intervals along the contour surfaces of each buried pool body. A reference electrode is used to be placed at a predetermined distance from the buried pool and to be in contact with the ground. A distributed receiving cable connects the plurality of receiving electrodes and the reference electrode to the receiver module; The receiver module includes a multi-channel signal conditioning and acquisition circuit, a reference voltage source, and a standard resistor. Each channel in the multi-channel signal conditioning and acquisition circuit includes a preamplifier circuit, a switching assembly, a bandpass filter, a power frequency bandstop filter, a programmable gain amplifier, and an analog-to-digital converter. The switching assembly is used to selectively connect the potential signal acquired by the receiving electrode and the standard voltage signal in the test circuit formed by the reference voltage source and the standard resistor to the preamplifier circuit, and to control the bandpass filter and the power frequency bandstop filter to connect to the signal path during AC potential testing. The transmitter module includes a digital control circuit, a transmission signal source, a drive circuit, and an H-bridge power amplifier module; the digital control circuit is configured to control the transmission signal source to generate a DC signal or an AC signal of a preset frequency, and output it to the positive and negative transmission electrodes through the drive circuit and the H-bridge power amplifier module. The communication module is used to establish a wireless communication connection between the host computer and the receiver module and transmitter module to transmit control commands and collect data.

2. The device for measuring the contour potential distribution of a buried pool according to claim 1, characterized in that: The bandpass filter is a Butterworth type bandpass filter with a passband frequency of 2.5Hz to 250Hz; the power frequency bandstop filter adopts a double quadratic form and is used to suppress frequencies of 50Hz and 150Hz.

3. The device for measuring the contour potential distribution of a buried pool according to claim 1, characterized in that: The analog-to-digital converter is a 24-bit or 32-bit converter, and a 32-bit converter is used to improve resolution when the signal frequency is below 1kHz.

4. The device for measuring the contour potential distribution of a buried pool according to claim 1, characterized in that: The switching devices of the H-bridge power amplifier module are MOSFETs, with a withstand voltage of not less than 600V and a rated current of not less than 20A.

5. The device for measuring the contour potential distribution of a buried pool according to claim 1, characterized in that: The programmable gain amplifier consists of a first gain level and a second gain level combination. The first gain level is 1, 2, 4, and 8 times, and the second gain level is 1, 10, 100, and 1000 times. By combining them, 16 gain ratios can be achieved.

6. The device for measuring the contour potential distribution of a buried pool according to claim 1, characterized in that: The power module includes an AC / DC converter, a rechargeable lithium battery, a charger, and a programmable power supply. When an external AC power source is connected, the AC / DC converter outputs DC power and charges the lithium battery through the charger, while simultaneously supplying power to the system. When there is no AC power, the lithium battery provides power. The programmable power supply is used to provide isolated power to each module.

7. A method for operating a device for measuring the profile potential distribution of a buried pool, applied to the device for measuring the profile potential distribution of a buried pool as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Place the positive transmitting electrode inside the buried pool and make it in contact with the liquid inside the pool. Place the negative transmitting electrode outside the outline of the pool, so that the line connecting it to the positive transmitting electrode is perpendicular to the outline surface to be measured. Arrange multiple receiving electrodes at equal intervals along the first measurement line of the outline surface to be measured of the buried pool and close to the pool. Place the reference electrode at a predetermined distance from the buried pool and make it in good contact with the ground. Connect each receiving electrode and the reference electrode to the portable host through distributed receiving cables. Connect the positive transmitting electrode and the negative transmitting electrode to the portable host through transmitting cables. After verifying the system connections are correct, power on and perform a self-test. Step 2: After the self-test is completed, set the receiving parameters. With the transmitter module not working, the receiver module measures the grounding resistance and channel drift of each receiving electrode through a loop consisting of a reference voltage source and a standard resistor. If the grounding resistance exceeds the threshold, the corresponding measuring point is subjected to resistance reduction measures and then measured again. Step 3: With the transmitter module continuously inactive, the receiver module switches to the natural potential channel, submits the receiver acquisition task, acquires the background field potential signal at each measurement point where the receiving electrode is located, performs spectrum analysis on the acquired signal, and determines the AC transmission frequencies f1 and f2 to avoid external interference based on the analysis results. Step 4: Set the transmitter module's transmission frequency to f1 and the empirical voltage, enable transmission, submit the acquisition task, and observe the data of each channel; confirm that the signal of each channel should be an AC signal of the set frequency and the amplitude should be within the preset range. If it exceeds the preset range, adjust the transmission voltage until the requirements are met. Step 5: After the status debugging is completed, submit the receiving electrode test task to the test line. The receiving electrode test task is executed in sequence according to the preset time sequence to measure the grounding resistance, natural potential, DC potential, AC potential at frequency f1, AC potential at frequency f2 and equivalent resistance. The acquisition, storage and transmission of each parameter are automatically completed under the control of a single command. Step 6: After completing the measurement of the current measurement line, move the multiple receiving electrodes backward a predetermined distance to form the next measurement line. Repeat steps 2 to 5 until all three measurement lines of the contour surface have been tested. Step 7: Repeat steps 1 to 6 to complete the potential test of the remaining measurable contour surfaces of the buried pool. Step 8: After all tests are completed, check the data quality using preprocessing software. If there are any missed or abnormal test points, rearrange the receiving electrodes at the missed or abnormal test points and repeat steps 2 to 5 for supplementary testing until the data quality is qualified. Send the final data to the interpreter, and the test is over.

8. The operating method of the device for measuring the contour potential distribution of a buried pool according to claim 7, characterized in that, In step one, the multiple receiving electrodes are arranged at equal intervals of 1m or 0.5m along the first measuring line; in step six, the receiving electrodes are moved backward by a predetermined distance of 0.5m or 1m.

9. The operating method of the device for measuring the contour potential distribution of a buried pool according to claim 7, characterized in that, The threshold value of the grounding resistance mentioned in step two is 5000Ω, and the resistance reduction measures include watering, applying conductive material, or applying mud.

10. The operating method of the device for measuring the contour potential distribution of a buried pool according to claim 7, characterized in that, The preset range mentioned in step four is 50mV to 1000mV; when measuring DC and AC potentials in step five, the transmit voltage is adjusted based on the principle that the analog-to-digital converter of the receiver module is in the optimal dynamic range; when measuring AC potentials, it is determined whether to connect the power frequency bandstop filter to the signal path according to the power frequency environment.

Images