A device for improving induced polarization immunity

Abstract

This application discloses a device for improving induced polarization (IP) interference immunity, relating to the field of geophysical exploration instruments. In this device, the normally open terminal of a high-voltage relay is connected to a power supply electrode in the IPI measurement electrode pit via a power supply line, while the normally closed terminal is connected to a common transmitting cable. A remote wireless communication module receives a start measurement command, and a controller controls the normally open terminal of the high-voltage relay to close. A first Hall current acquisition module measures the analog current signal of the power supply line, converts it into an analog voltage signal, and then an analog-to-digital converter further converts it into a digital voltage signal. Simultaneously, the controller receives its own latitude and longitude and UTC time from the GPS positioning module, obtains the current value, and forms a correlation sequence of latitude and longitude, UTC time, and current value. Upon receiving a stop measurement command, the controller controls the normally open terminal of the high-voltage relay to open and the normally closed terminal to close. This application enables remote wireless switching of the transmitter electrode, achieving IPI interference immunity measurement.

Description

Technical Field

[0001] This application relates to the field of geophysical exploration instruments, and in particular to a device for improving induced polarization (IP) interference immunity. Background Technology

[0002] With the surge in demand for mineral products and the continuous mining operations, many large and medium-sized non-ferrous metal mines are facing varying degrees of resource crisis after years of exploitation. Crisis mines refer to large and medium-sized mines whose recoverable reserves have a service life of less than 5 years (severe crisis), 10 years (moderate crisis), and 15 years (mild crisis) under existing mining technologies and capabilities. After decades of multiple rounds of mineral exploration, near-surface prospecting has become increasingly difficult. Previous methods focusing on near-surface mineralization clues are no longer sufficient, making deep (peripheral) prospecting an urgent necessity and a crucial direction for breakthroughs in crisis mine exploration. However, operating mines contain numerous electronic devices, such as motors, fans, and compressors. Changes in the current generated by these motors produce magnetic and electric fields, leading to electromagnetic interference. These devices are widely used in mine ventilation and drainage systems. The magnetic and electric fields generated by high-power and high-voltage components can also couple to the ground, resulting in voltage changes ranging from tens to hundreds of mV. Deep ore bodies can only generate a few mV induced polarization signals, which are completely drowned out by noise. Induced polarization measurements cannot collect useful data and are powerless for secondary exploration in the deep edges of crisis mines and for deep mineral exploration in exploration areas.

[0003] 24-hour noise monitoring at the mine revealed intermittent periods of noise, with brief periods of several tens of seconds where the interference was relatively minor. Figure 1 As shown, relatively good data can be collected. Figure 1 The horizontal axis in the graph represents the time series. Figure 1 The vertical axis represents the voltage amplitude. The interference signal strength is significantly lower at night than during the day, such as... Figure 2 As shown, however, the metal mines are mainly located in mountainous areas with poor terrain. Figure 2 The vertical axis in the diagram represents voltage. Geophysical exploration personnel obviously cannot manually change the emitter at night to collect data. Therefore, there is an urgent need to solve the problem of automatically collecting geophysical induced polarization (IP) data and achieving IPI measurement with anti-interference capabilities. Summary of the Invention

[0004] The purpose of this application is to provide a device for improving induced polarization (IP) interference immunity, which can remotely and wirelessly switch the transmitter to achieve IPI interference immunity measurement.

[0005] To achieve the above objectives, this application provides the following solution:

[0006] This application provides a device for improving induced polarization (IP) interference immunity, comprising: a remote wireless communication module, a controller, a high-voltage relay, a first Hall current acquisition module, an analog-to-digital conversion module, and a GPS positioning module. The normally open terminal of the high-voltage relay is connected to the power supply electrode in the IPI measurement power supply electrode pit via a power supply line, and the normally closed terminal of the high-voltage relay is connected to a common transmission cable.

[0007] The remote wireless communication module is used to receive a start measurement command and send it to the controller; the start measurement command is generated by the main control center at the start time of the nighttime period when electromagnetic interference is minimal; the controller is used to control the normally open terminal of the high-voltage relay to close according to the start measurement command; the first Hall current acquisition module is used to measure the analog current signal of the power supply line, convert the analog current signal into an analog voltage signal, and transmit it to the analog-to-digital conversion module; the analog-to-digital conversion module is used to convert the analog voltage signal into a digital voltage signal and transmit it to the controller; the controller is also used to receive its own latitude and longitude and UTC time (Coordinated Universal Time) located by the GPS positioning module while the first Hall current acquisition module measures the analog current signal of the power supply line, and obtain the current value according to the digital voltage signal, forming a correlation sequence of latitude and longitude, UTC time, and current value.

[0008] The remote wireless communication module is also used to receive a stop measurement command and send it to the controller; the stop measurement command is generated by the main control center at the termination time during the nighttime period when electromagnetic interference is minimal; the controller is also used to control the normally open terminal of the high-voltage relay to open and the normally closed terminal of the high-voltage relay to close according to the stop measurement command.

[0009] According to the specific embodiments provided in this application, this application has the following technical effects:

[0010] This application provides a device for improving induced polarization interference immunity. During nighttime periods when electromagnetic interference is low in mines, the normally open terminal of a high-voltage relay is closed by remote wireless control, and the first Hall current acquisition module collects valid data. After the nighttime period with low electromagnetic interference ends, the normally open terminal of the high-voltage relay is opened and the normally closed terminal is closed by wireless control, completing the remote wireless switching of the power supply electrode and realizing induced polarization interference immunity measurement. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of existing local, interference-free data;

[0013] Figure 2 A schematic diagram of existing 24-hour noise monitoring in a mine;

[0014] Figure 3 A structural block diagram of a device for improving induced polarization interference immunity provided in this application;

[0015] Figure 4 This is a schematic diagram of the working process of the device in this application;

[0016] Figure 5 This is a connection diagram of the device in this application. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In one exemplary embodiment, such as Figure 3 As shown, a device for improving induced polarization (IP) interference immunity is provided, comprising: a remote wireless communication module, a controller, a high-voltage relay, a first Hall current acquisition module, an analog-to-digital conversion module, and a GPS positioning module. The normally open terminal of the high-voltage relay is connected to the power supply electrode in the IPI measurement power supply electrode pit via a power supply line, and the normally closed terminal of the high-voltage relay is connected to a common transmission cable.

[0020] The remote wireless communication module is used to receive the start measurement command and send it to the controller. The start measurement command is generated by the main control center at the start time of the nighttime period when electromagnetic interference is minimal. The controller is used to control the normally open terminal of the high-voltage relay to close according to the start measurement command. The first Hall current acquisition module is used to measure the analog current signal of the power supply line, convert the analog current signal into an analog voltage signal, and then transmit it to the analog-to-digital conversion module. The analog-to-digital conversion module is used to convert the analog voltage signal into a digital voltage signal and transmit it to the controller. The controller is also used to receive its own latitude and longitude and UTC time located by the GPS positioning module while the first Hall current acquisition module is measuring the analog current signal of the power supply line, and obtain the current value according to the digital voltage signal to form a correlation sequence of latitude and longitude, UTC time and current value.

[0021] The remote wireless communication module is also used to receive stop measurement commands and send them to the controller; the stop measurement command is generated by the main control center at the end time of the nighttime period when electromagnetic interference is minimal; the controller is also used to control the normally open terminal of the high-voltage relay to open and the normally closed terminal of the high-voltage relay to close according to the stop measurement command.

[0022] The device described in this application enables remote wireless switching of the transmitting electrode, eliminating the need for geophysical personnel to manually change the transmitting electrode on-site, thus ensuring personnel safety and improving efficiency. It also allows for the acquisition of induced polarization (IP) measurement data at night when human interference is minimal, solving the problem that many metal mines are located in mountainous areas where IPA work cannot be carried out.

[0023] In one example, the controller is an embedded controller—an MCU (Microcontroller Unit). The MCU uses a 32-bit ARM processor, which is the brain of the entire system. It receives GPS information through USART, controls the analog-to-digital converter module through SPI communication, and controls the high-voltage relay through I / O ports. Figure 3 The MCU controller in this system is an embedded system based on the STM32 microcontroller (STM32F103ZET6). This chip has a main frequency of 72MHz and rich communication interfaces (USART, SPI, SDIO, I2C, etc.) and GPIO resources, meeting the needs of multi-module collaborative control.

[0024] The MCU acts as the brain of the entire system, controlling and configuring various peripherals. The 24-bit analog-to-digital converter chip ADS1255 communicates with the MCU via SPI1; the MCU connects to the LoRa wireless module via USART1; USART2 connects to the 4G DTU module; USART3 connects to the GPS positioning module; and the MCU controls the isolation drive circuit via I / O ports, further controlling the high-voltage ceramic vacuum DC relay; the MCU internally incorporates the FATFS file system, using SDIO to drive the SD card for data storage and retrieval.

[0025] As an optional implementation, the remote wireless communication module includes a LORA wireless module and a 4G DTU module. Both the LORA wireless module and the 4G DTU module are connected to the controller; when there is no 4G signal, the LORA wireless module is used to receive start measurement commands or stop measurement commands; when there is a 4G signal, the 4G DTU module is used to receive start measurement commands or stop measurement commands.

[0026] In this implementation, the MCU communicates with the LORA wireless module and the 4G DTU module using USART. The LORA wireless module is model ATK-MW1278D. This module connects to the STM32 microcontroller via the USART1 interface. The STM32 microcontroller uses the AT command set to control the LORA wireless module's start / stop, network reception control commands, and exploration data transmission. The LORA wireless module uses the high-efficiency ISM band RF SX1278 spread spectrum chip, with an operating frequency of 410MHz to 441MHz and a maximum communication distance of 3000m. It is used to build a self-organizing network in areas without mobile phone signal (such as deep mountain mining areas) to realize communication between devices and command transmission and data feedback to a remote control center.

[0027] The 4G DTU module, model ATK-D43-C, connects to an STM32 microcontroller via a USART2 interface. The STM32 microcontroller configures the module using AT commands. This module has a built-in IoT card, fully compatible with the 4G networks of China Mobile, China Unicom, China Telecom, and China Broadcasting Network, enabling remote data transmission and control command reception within 4G signal coverage areas.

[0028] The device uses 4G signals and LoRa communication for control, and is not limited by the working area. It can be used in operating mines and uninhabited areas, enabling field geophysical data collection even at night.

[0029] As an optional implementation, the GPS positioning module adopts a GPS+BeiDou dual-mode positioning module. The GPS positioning module uses an ATK-S1216F8-BD chip and connects to the STM32 microcontroller via USART3. The GPS positioning data output by the GPS positioning module uses the NMEA-0183 protocol, and the control protocol is the SkyTraq protocol. The MCU receives the NMEA protocol data transmitted via the serial port, parses it to obtain accurate UTC time, latitude and longitude coordinates, satellite count, and other information for data synchronization and marking. The MCU controller can also set the GPS sampling rate, baud rate, and output information via the SkyTraq control protocol; the default baud rate used by serial port 3 is 9600, with 1 stop bit, 8 data bits, and no parity bit.

[0030] The analog-to-digital converter (ADC) module has a 24-bit resolution and a sampling rate of 5Hz. The core chip of the ADC module is the ADS1255, which has multiple operating modes and a maximum sampling rate of 30KSPS to meet the requirements of high-speed dynamic signal acquisition. It communicates with the STM32 microcontroller via SPI. The acquisition board is configured with a default sampling rate of 5SPS upon power-up. The STM32 microcontroller modifies the sampling rate by configuring the ADS1255's internal registers via SPI1. The acquisition board continuously outputs the acquired data. The STM32 microcontroller also sends register configuration commands via the SPI protocol to set the operating parameters of the ADC module, such as configuring the gain amplifier factor and differential / single-ended input channels.

[0031] The high-voltage relay is a high-voltage ceramic vacuum DC relay, specifically the JPK-2 type. An STM32 microcontroller controls its normally open or normally closed state via an isolated drive circuit. Its rated operating voltage is 12kV, maximum current carrying capacity is 30A, contact resistance is ≤0.025Ω, and insulation resistance is ≥10GΩ. It uses a ceramic-sealed housing and has a 5-pin physical interface (common / normally open / normally closed / coil + / coil -). The device in this application uses a vacuum DC relay to achieve mechanical switching of the 2000V transmission voltage.

[0032] As an optional implementation, the device for improving induced polarization interference immunity further includes: a second Hall current acquisition module; the second Hall current acquisition module is connected to the analog-to-digital converter module. The second Hall current acquisition module is used to measure the analog current signal of the common transmitting cable when the normally closed terminal of the high-voltage relay is closed, and then converts the analog current signal of the common transmitting cable into a voltage analog signal before transmitting it to the analog-to-digital converter module. This facilitates subsequent verification of whether the switching transmission is correct based on the current file of each device.

[0033] In this implementation, the core chip of the first and second Hall current acquisition modules is the ACS724, a high-precision current sensor based on the Hall effect principle. Its measurement range is -50A to 50A, with a measurement accuracy of 40mV / A. Its VIOUT pin is connected to the analog-to-digital converter module, and the main control unit calculates the current value by reading the voltage value from the analog-to-digital converter module.

[0034] Both the first and second Hall current acquisition modules include a current sensor and an operational amplifier. The operational amplifier is connected between the current sensor (ACS724) and the analog-to-digital converter (ADS1255).

[0035] The normally closed and normally open terminals of this device, in conjunction with a GPS clock, collect current data in real time for later checks on whether the transmission is correct.

[0036] As an optional implementation, the device of this application further includes a memory. A FATFS file system is embedded within the controller. The FATFS file system is used to sort current values ​​into time-series files and transfer them to the memory. The memory is used to name and store the time-series files using its own latitude and longitude and UTC time located by the GPS positioning module.

[0037] In this implementation, a 32GB SD card is used for memory, connected to the STM32 microcontroller's I / O pins via an SDIO interface. The STM32 microcontroller uses a 4-wire SDIO driver mode for fast file writing. Data written to the SD card uses DMA transfer mode to avoid affecting interrupts and reduce CPU usage. The FATFS file system is internally implemented, sorting data as time-series files and naming them with latitude and longitude coordinates and time data collected by the GPS positioning module. The MCU drives the SD card using SDIO.

[0038] After data acquisition is complete, the main control center also sends a command to the controller via the remote wireless communication module to indicate whether data should be transmitted back. When the main control center sends the command to the controller via the remote wireless communication module, the controller reads the time series file from the memory and transmits it back to the main control center via the remote wireless communication module.

[0039] As an optional implementation, the device of this application further includes: an isolation drive circuit; the isolation drive circuit is connected to both the controller and the high-voltage relay. The isolation drive circuit is used to drive the switching between the normally open and normally closed terminals of the high-voltage relay under the control of the controller. The isolation drive circuit ensures complete electrical isolation between the STM32 microcontroller (low-voltage side) and the high-voltage relay coil (high-voltage drive side), preventing high-voltage crosstalk from damaging the control circuit.

[0040] The isolation drive circuit includes an optocoupler isolator and a MOSFET power amplifier circuit. The input side of the optocoupler is connected to the controller, and the output side of the optocoupler is connected to the gate of the MOSFET power amplifier circuit. The source of the MOSFET power amplifier circuit is grounded, and the drain of the MOSFET power amplifier circuit is connected to the positive terminal of the high-voltage relay coil.

[0041] When the MCU uses STMicroelectronics' 32-bit ARM processor and selects the STM32F103ZET6 32-bit ARM Cortex-M3 microcontroller as the main control unit, the STM32's GPIO pins are connected to the optocoupler input side (LED end) and connected in series with a current-limiting resistor R1.

[0042] The optocoupler is model TLP785, with an isolation withstand voltage of 5000Vrms.

[0043] The operation of the high-voltage relay driven by the microcontroller's instructions is as follows: When the STM32 outputs a high level (3.3V), this high-level signal is transmitted to the anode of the optocoupler's input side through a current-limiting resistor. The LED inside the optocoupler is forward biased and illuminates, triggering the phototransistor on the output side of the optocoupler to enter saturation conduction. The output potential of the optocoupler is thus rapidly pulled down to near ground level (0V). This low-level signal directly acts on the gate of the N-channel MOSFET, causing the MOSFET to immediately conduct and form a low-impedance path. The drive current then flows from the positive terminal of the power supply through the relay coil, the MOSFET drain, and the source, forming a complete circuit. The strong magnetic field generated by the coil drives the internal armature to overcome the spring resistance and move towards the iron core. Through a mechanical linkage mechanism, the normally open contact (NO) is forced to close, connecting the high-voltage measurement circuit, while the normally closed contact (NC) is separated to achieve electrical isolation.

[0044] As an optional implementation, the device of this application further includes a power supply module. The power supply module provides a 3.3V voltage to the controller and a 5V voltage to the first Hall current acquisition module, the remote wireless communication module, the GPS positioning module, and the analog-to-digital conversion module. The power supply module also provides ±5V and ±15V voltages to the operational amplifier in the Hall current acquisition module. An isolated power supply module is used, resulting in low ripple.

[0045] The power module uses a 12V lithium battery and needs to provide ±15V and ±5V voltages to the operational amplifiers, using rail-to-rail op-amps. The ±15V and ±5V voltages are for analog circuits and require low noise; the 12V lithium battery to 15V voltage is a boost converter, so a DC-DC module is used. The 5V and 3.3V voltages for the digital circuits are provided by LDOs (Low Dropout Voltage Regulators), which have low ripple and are suitable for digital circuits with small voltage drop and low power.

[0046] Reference Figure 3 The working principle of the device in this application is as follows:

[0047] The MCU controller first inputs configuration information to the analog-to-digital converter (ADC) module via SPI and receives ADC data collected by the ADC module. After receiving instructions from the main control center, the LoRa wireless module and the 4G DTU module transmit these instructions to the MCU controller via USART. The MCU controller internally parses the data to obtain instructions for controlling the isolation drive circuit, further controlling whether the high-voltage relay is normally open or normally closed. The MCU also receives GPS+BD positioning data from the GPS module via serial port, and obtains longitude, latitude, and UTC time data by parsing the NMEA-0183 protocol. This data, along with the collected ADC values, is stored on the SD card using SDIO. The Hall current acquisition module converts the collected current value into voltage, and then, through the ADC module, multiplies the obtained ADC value by the gain factor of the ADS1255 operational amplifier to obtain the current value.

[0048] During fieldwork, the launch pits (power supply electrode pits) are connected in advance, and one device of this application is placed at each launch point (power supply electrode pit). That is, when multiple power supply electrode pits are pre-excavated on the mine's survey line, a device to improve induced polarization interference immunity is placed in each power supply electrode pit. For example... Figure 5 As shown, along the extension direction of the measuring line, the common terminal of the high-voltage relay in the first set of devices for improving induced polarization (IP) interference immunity is connected to the main transmission line. The normally closed terminal of the high-voltage relay in the preceding set of devices for improving IPA interference immunity is connected to the common terminal of the high-voltage relay in the next set of devices for improving IPA interference immunity via a common transmission cable. The normally closed terminal of the high-voltage relay in the last set of devices for improving IPA interference immunity is left floating. Multiple power supply electrodes can be connected when no power is supplied. Later, a microcontroller will be used to control the vacuum high-voltage relay to achieve 2000V DC voltage load switching, eliminating the need for manual switching of power supply electrode pits.

[0049] Reference Figure 4 The workflow of the device in this application includes the following steps:

[0050] 1. Wiring connection: Before the exploration and construction begins, geophysical personnel will dig several power supply electrode pits on the selected survey line and connect the equipment according to the specifications, and connect the high-voltage relay to the common transmission cable.

[0051] 2. Device Self-Test and Positioning: After the device is powered on, the MCU first initializes all peripherals:

[0052] (1) The GPS / BeiDou module locates and records its own latitude and longitude coordinates to obtain accurate UTC time.

[0053] (2) Attempt to establish a connection with the main control center (exploration data monitoring center) through the 4G DTU / LoRa module.

[0054] (3) Perform self-tests on modules such as current acquisition and storage.

[0055] (4) The detection results and location information are wirelessly transmitted back to the main control center.

[0056] 3. Waiting for Remote Command Trigger: The main control center selects a period with less electromagnetic interference based on 24-hour noise monitoring data from the mine. The main control center sends commands wirelessly. Upon receiving the command, the STM32 microcontroller controls the high-voltage ceramic vacuum DC relay via the isolation drive circuit. If a mobile phone signal is available in the area, 4G is used to send the command; otherwise, LoRa communication is used. When the STM32 microcontroller receives the "Start Measurement Command" from the main control center, its GPIO pin outputs a high-level signal. This high-level signal is transmitted to the drive circuit through an optocoupler, energizing the coil of the high-voltage ceramic vacuum DC relay, causing the normally open contacts of the relay to close, thus connecting the 2kV high-voltage measurement circuit.

[0057] 4. The device acquires data according to the specified command: The STM32 microcontroller drives the relay to complete the specified operation and stores the acquired data to the SD card according to the GPS-acquired latitude and longitude coordinates and time data, waiting for the next command.

[0058] 5. Remote Command Transmission and Acquisition Completion: The main control center sends an acquisition completion command. Upon receiving the command, the STM32 microcontroller again controls the high-voltage ceramic vacuum DC relay via the control isolation drive circuit. Specifically, upon receiving the "stop measurement command," the STM32's GPIO outputs a low level, the relay coil is de-energized, the normally open contact resets and opens, the high-voltage measurement circuit is cut off, and data acquisition stops. Simultaneously, the main control center selects whether to transmit data back. If so, the data is transmitted back wirelessly in time sequence.

[0059] like Figure 5 As shown, before the exploration work began, geophysical personnel pre-excavated several power supply electrode pits (E1, E2, ..., En) along the selected survey line. One set of this device was placed in each electrode pit. Figure 5 (Represented by S1, S2, ..., Sn). Connect the normally closed (NC) terminal of the high-voltage ceramic vacuum DC relay (represented by K1, K2, ..., Kn) to the common transmitting cable (provided with high-voltage current by the power supply station), the normally open (NO) terminal to the power supply electrode pit, and the common terminal (COM) to the main transmitting line. Ensure that all relays are in the initial state (when the MCU is not driven), with the common terminal connected to the normally closed terminal (i.e., the power supply electrode).

[0060] In summary, the device for improving induced polarization interference immunity of this application sends commands to the STM32 as the main control device via remote wireless communication (4G signal and LoRa communication) through the main control center. The STM32 controls the high-voltage ceramic vacuum DC relay through the isolation drive circuit according to the instructions. At the same time, the FATFS file system is internally installed. According to the data sent by the GPS module, the collected data is stored in real time in the SD card with the GPS-collected latitude and longitude coordinates and time data. When the collection is completed, the data can be selected to be transmitted back according to the instructions.

[0061] This device not only enables all-terrain wireless control, allowing for applications in both operating mines and uninhabited areas, but also facilitates safe high-voltage switching, avoiding the dangers of personnel conducting on-site mine exploration and the risk of electric shock from high voltage through remote control. Furthermore, it utilizes remote wireless data transmission, eliminating the cumbersome operation of on-site storage device retrieval, and names files with GPS-collected latitude and longitude coordinates and time data, significantly improving data readability and processing efficiency.

[0062] During the daytime, when noise levels are high, the remotely controlled transmitter does not collect data. Data collection begins at night during the noise gap, allowing the transmitter to measure data during periods of low interference. This application achieves unmanned switching of power supply electrodes outdoors at night. The device is highly efficient, effectively improving data acquisition quality and increasing exploration depth. It is suitable for deep-edge mineral exploration in old and crisis-prone mines.

[0063] Compared with existing conventional induced polarization (IP) acquisition methods, the advantages of this application are:

[0064] (1) Strong anti-interference acquisition capability and high acquisition accuracy

[0065] Existing technology: Traditional systems can only collect data during the daytime when there is low interference, with a signal-to-noise ratio of ≤-18dB; they use ADCs with less than 16 bits, resulting in a low sampling rate and an inability to capture transient low-noise periods;

[0066] This application uses an embedded controller to receive GPS / BeiDou data for synchronous triggering and acquisition, employing a 24-bit ADC module with high-speed sampling at 5Hz, thus improving acquisition accuracy. Simultaneously, during periods of low noise at night, single-point switching can be completed within 15 seconds via wireless control, increasing acquisition time and further improving acquisition accuracy.

[0067] (2) Using remote wireless technology to switch the transmitting pole

[0068] Existing technology relies on manual on-site entry into deep mountains to switch electrodes, and high voltage requires power outage operation, which is time-consuming and affects exploration work, while also reducing collection time and efficiency.

[0069] This application allows for the control and switching of electrode pits indoors using wireless (4G, LoRa communication) without the need for power outages or on-site replacements, ensuring personnel safety. It also allows for one-click switching of multiple electrodes, improving personnel work efficiency.

[0070] (3) Diversified wireless communication methods

[0071] Existing technology: Relying solely on a single communication method makes it impossible to select the best communication method tailored to different terrains and environments.

[0072] This application uses 4G signals and LoRa communication to communicate with the embedded controller, providing dual protection and is not limited by the working area, allowing it to be applied in both producing mines and uninhabited areas.

[0073] (4) The data is intuitive and easy to understand, and highly operable.

[0074] Current technology: Data is stored as raw binary data, requiring specialized software for parsing. When dealing with multiple devices located in different locations, the values ​​from the memory must be read one by one on-site. The read data values ​​are not sorted, making the process time-consuming, labor-intensive, and difficult to analyze.

[0075] This application employs an embedded controller internally ported to the FATFS file system, sorting data as time-series files and naming files with GPS coordinates. This provides strong data visualization during post-processing and allows for batch modification and data retrieval. Simultaneously, it can remotely communicate with LoRa via 4G signals to control the embedded controller to read data stored on the SD card and transmit it back.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A device for improving induced polarization interference immunity, characterized in that, The device for improving induced polarization interference immunity includes: a remote wireless communication module, a controller, a high-voltage relay, a first Hall current acquisition module, an analog-to-digital conversion module, and a GPS positioning module; The normally open terminal of the high-voltage relay is connected to the power supply electrode in the induced polarization measurement power supply electrode pit via the power supply line, and the normally closed terminal of the high-voltage relay is connected to the common transmission cable. The remote wireless communication module is used to receive a start measurement command and send it to the controller; the start measurement command is generated by the main control center at the start time of the nighttime period when electromagnetic interference is minimal; the controller is used to control the normally open terminal of the high-voltage relay to close according to the start measurement command; the first Hall current acquisition module is used to measure the analog current signal of the power supply line, convert the analog current signal into an analog voltage signal, and then transmit it to the analog-to-digital conversion module; the analog-to-digital conversion module is used to convert the analog voltage signal into a digital voltage signal and transmit it to the controller; the controller is also used to receive its own latitude and longitude and UTC time located by the GPS positioning module while the first Hall current acquisition module is measuring the analog current signal of the power supply line, and obtain the current value according to the digital voltage signal, forming a correlation sequence of latitude and longitude, UTC time, and current value; The remote wireless communication module is also used to receive a stop measurement command and send it to the controller; the stop measurement command is generated by the main control center at the termination time during the nighttime period when electromagnetic interference is minimal; the controller is also used to control the normally open terminal of the high-voltage relay to open and the normally closed terminal of the high-voltage relay to close according to the stop measurement command. The main control center is also used to send instructions to the controller via the remote wireless communication module to indicate whether data should be transmitted back. When the main control center sends a data feedback instruction to the controller via the remote wireless communication module, the controller reads the time series file from the memory and sends it back to the main control center via the remote wireless communication module.

2. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The remote wireless communication module includes: a LORA wireless module and a 4G DTU module; Both the LORA wireless module and the 4G DTU module are connected to the controller; When there is no 4G signal, the LORA wireless module is used to receive start or stop measurement commands; When a 4G signal is available, the 4G DTU module is used to receive start or stop measurement commands.

3. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The device for improving induced polarization interference immunity also includes: a second Hall current acquisition module; The second Hall current acquisition module is connected to the analog-to-digital conversion module; The second Hall current acquisition module is used to measure the analog current signal of the common transmitting cable when the normally closed terminal of the high-voltage relay is closed, and then converts the analog current signal of the common transmitting cable into an analog voltage signal and transmits it to the analog-to-digital converter module.

4. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The device for improving induced polarization interference immunity also includes: a memory; The FATFS file system is ported to the controller. The FATFS file system is used to sort the current values ​​as time series files and transfer them to the memory. The memory is used to name and store time series files based on the GPS positioning module's own latitude, longitude, and UTC time.

5. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The device for improving induced polarization interference immunity also includes: an isolation drive circuit; The isolated drive circuit is connected to the controller and the high-voltage relay respectively; The isolation drive circuit is used to drive the switching between the normally open and normally closed terminals of the high-voltage relay under the control of the controller.

6. The device for improving induced polarization interference immunity according to claim 5, characterized in that, The isolation drive circuit includes: an optocoupler isolator and a MOSFET power amplifier circuit; The input side of the optocoupler is connected to the controller, and the output side of the optocoupler is connected to the gate of the MOSFET power amplifier circuit; the source of the MOSFET power amplifier circuit is grounded, and the drain of the MOSFET power amplifier circuit is connected to the positive terminal of the coil of the high-voltage relay.

7. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The device for improving induced polarization interference immunity also includes: a power supply module; The power supply module provides 3.3V to the controller and 5V to the first Hall current acquisition module, the remote wireless communication module, the GPS positioning module, and the analog-to-digital conversion module.

8. The device for improving induced polarization interference immunity according to claim 1, characterized in that, The analog-to-digital conversion module has a resolution of 24 bits and a sampling rate of 5Hz.

9. The device for improving induced polarization interference immunity according to claim 1, characterized in that, When multiple power supply electrode pits are pre-dug on the survey line of the mine, a set of the device for improving induced polarization interference is placed in each power supply electrode pit; Along the extension direction of the measuring line, the common terminal of the high-voltage relay in the first set of devices for improving induced polarization interference immunity is connected to the main transmission line. The normally closed terminal of the high-voltage relay in the previous set of devices for improving induced polarization interference immunity is connected to the common terminal of the high-voltage relay in the next set of devices for improving induced polarization interference immunity through a common transmission cable. The normally closed terminal of the high-voltage relay in the last set of devices for improving induced polarization interference immunity is left floating.

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