Magnetotelluric data acquisition and transmission system

Abstract

The utility model belongs to the technical field of geophysical exploration, and relates to a magnetotelluric data acquisition and transmission system, which comprises a plurality of acquisition terminals, each acquisition terminal is connected with data primary processing equipment, all the data primary processing equipment is connected to centralized storage processing equipment through a network, and the centralized storage processing equipment is connected with the terminals; wherein the acquisition terminal comprises a single-chip microcomputer, a magnetic field sensor, an electric field sensor, a first wireless communication module, an analog-to-digital conversion module, an acquisition monitoring module, a positioning module, a signal conditioning circuit and a storage module, and the first wireless communication module, the analog-to-digital conversion module, the acquisition monitoring module, the storage module and the positioning module are connected with the single-chip microcomputer; the electric field sensor and the magnetic field sensor are connected with the signal conditioning circuit, and the signal conditioning circuit is connected with the analog-to-digital conversion module. According to the utility model, the defects of high power consumption and difficulty in control are overcome, high-speed stable transmission is realized, the signal acquisition precision of the sensor is improved, and the sensor has development potential.

Description

Technical Field

[0001] The utility model belongs to the technical field of geophysical exploration, and in particular relates to a magnetotelluric data acquisition and transmission system. Background Art

[0002] With the rapid increase in the global population, the demand for natural resources is increasing day by day. Excessive resource exploration has led to an increasing frequency of natural disasters such as earthquakes. In order to obtain the electromagnetic data of the earth in a timely and comprehensive manner and make reasonable predictions of natural disasters and resource distribution, people have gradually expanded the breadth of field exploration, and various data acquisition and transmission systems have emerged in an endless stream, with the scope of control increasing day by day. However, in most cases, the environment where the magnetotelluric data is collected is very harsh, which brings challenges to the collection of electromagnetic data on the earth and puts forward higher requirements for the reliability and stability of the system. Utility Model Content

[0003] In order to solve the related problems in the background technology, the utility model provides a magnetotelluric data acquisition and transmission system.

[0004] The utility model is achieved in this way:

[0005] A magnetotelluric data acquisition and transmission system comprises: a plurality of acquisition terminals, each of which is connected to a preliminary data processing device, all preliminary data processing devices are connected to a centralized storage and processing device via a network, and the centralized storage and processing device is connected to the terminal; wherein the acquisition terminal comprises a single-chip microcomputer, a magnetic field sensor, an electric field sensor, a first wireless communication module, an analog-to-digital conversion module, an acquisition monitoring module, a positioning module, a storage module and a signal conditioning circuit, the first wireless communication module, the analog-to-digital conversion module, the acquisition monitoring module, the storage module and the positioning module are connected to the single-chip microcomputer, the electric field sensor and the magnetic field sensor are connected to the signal conditioning circuit, and the signal conditioning circuit is connected to the analog-to-digital conversion module.

[0006] Furthermore, the single chip microcomputer selects STM32F103ZET6 as the preliminary data processing device, and the FT232R chip is selected as the USB to serial port.

[0007] Furthermore, the magnetic field sensor is composed of an inductive magnetic field sensor chip MC-50 and a fluxgate magnetic field sensor chip DRV421, and the electric field sensor is composed of a LDYJ-G-001 chip with Ag / AgCl as a non-polarizable electrode material.

[0008] Furthermore, the signal conditioning circuit includes a signal amplification circuit and a signal filtering circuit, which are responsible for performing signal amplification and signal filtering operations on the data collected by the electric field sensor and the magnetic field sensor.

[0009] Furthermore, the analog-to-digital conversion module uses the ADS1255 chip to receive low-level input signals directly from the sensor.

[0010] Furthermore, the positioning module uses an ATK-1218-BD chip that can simultaneously receive signals from both Beidou and GPS satellite frequency bands.

[0011] Furthermore, the acquisition monitoring module uses a MAX706AT single-chip monitoring circuit chip.

[0012] Furthermore, the storage module includes an external expansion SRAM, using an IS62WV51216 chip.

[0013] Furthermore, the data preliminary processing device includes a second wireless communication module connected to the first wireless communication module of the acquisition terminal for bidirectional data communication, a third wireless communication module for data communication with the centralized storage and processing device, and a microcontroller connecting the second wireless communication module and the third wireless communication module, and the microcontroller adopts Raspberry Pi 4B.

[0014] Furthermore, the first wireless communication module and the second wireless communication module both adopt the NB-loT wireless communication module BC26, and the third wireless communication module is the 5G communication module RM500Q-GL.

[0015] Furthermore, the centralized storage and processing device is a remote computer, and the terminal is a mobile device.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 5G communication module has the characteristics of low latency, high speed and large capacity transmission, which makes it stand out in wireless communication methods. However, in some remote areas, 5G network is not fully covered. NB-IoT communication module network has the characteristics of long operation time, wide coverage and many access terminals. In addition, the existing magnetotelluric data acquisition and transmission system only uses a single data communication method in most cases in terms of data transmission. Although it reduces the complexity of the system, it cannot be adapted to local conditions according to the characteristics of the transmission objects, and it is impossible to make up for the shortcomings. Therefore, the transmission system is divided into sections in turn, and the optimal transmission scheme is selected in each section to enhance the transmission efficiency and quickly obtain accurate dynamic information. It has great research prospects.

[0018] The corresponding hardware components adopted in this novel device overcome the disadvantage of the existing magnetotelluric data acquisition and transmission system that it generates high power consumption during data acquisition and transmission, and reduce the problem of battery power waste. It can maintain the equipment working stably for a long time in the field environment where stable mains power supply is not available.

[0019] The magnetic field sensor used in this new type is composed of an inductive magnetic field sensor chip MC-50 and a fluxgate magnetic field sensor chip DRV421, and the electric field sensor is composed of a LDYJ-G-001 chip with Ag / AgCl as a non-polarized electrode material. This overcomes the problems of the magnetic field sensor used in the existing magnetotelluric data acquisition and transmission system in terms of magnetic field collection efficiency and the electric field sensor in terms of electrode reaction rate, and reduces the impact of noise on the acquisition results during the acquisition process.

[0020] The adopted collection monitoring circuit can avoid the dilemma of stopping collection when the collection terminal fails in the field, which requires manual troubleshooting in the field environment. It saves a lot of manpower and material resources. The collection terminal can be automatically reset through the control of the collection monitoring circuit to collect data again. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural block diagram of the acquisition and transmission system of the utility model;

[0022] Figure 2 This is a structural connection block diagram of the acquisition terminal of the utility model;

[0023] Figure 3 It is a structural connection block diagram of the data preliminary processing device of the utility model;

[0024] Figure 4 This is a schematic diagram of the signal detection module of the present utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0026] See also Figure 1 and Figure 2As shown, a magnetotelluric data acquisition and transmission system includes: multiple acquisition terminals 104, each acquisition terminal 104 is connected to a data preliminary processing device 103, all data preliminary processing devices 103 are connected to a centralized storage processing device 102 through a network, and the centralized storage processing device 102 is connected to the terminal 101; the acquisition terminal 104 includes a single-chip microcomputer 1061, an electric field sensor 1062, a magnetic field sensor 1063, an analog-to-digital conversion module 1064, a positioning module 1065, a first wireless communication module 1066, an acquisition monitoring module 1067, a storage module 1068 and a signal conditioning circuit 1069, and the analog-to-digital conversion module 1064, the positioning module 1065, the first wireless communication module 1066, the acquisition monitoring module 1067 and the storage module 1068 are connected to the single-chip microcomputer 1061. The electric field sensor 1062 and the magnetic field sensor 1063 are connected to the signal conditioning circuit 1069, and the signal conditioning circuit 1069 is connected to the analog-to-digital conversion module 1064.

[0027] The single chip computer 1061 selects STM32F103ZET6 as the preliminary data processing device, and the FT232R chip is selected as the USB to serial port.

[0028] The electric field sensor 1062 and the magnetic field sensor 1063 can have multiple implementation schemes. The magnetic field sensor 1063 can select an inductive magnetic field sensor or a fluxgate magnetic field sensor to measure the magnetic field data of the earth. The electric field sensor 1062 can simply select an existing chip to measure the electric field data of the earth.

[0029] See also Figure 2 As shown, among the above technical solutions, the most preferred technical solution is to select a composite magnetic field sensor 1063 and an improved electric field sensor 1062, wherein the magnetic field sensor 1063 is composed of an inductive magnetic field sensor MC-50 and a fluxgate magnetic field sensor DRV421, covering the DC-2kHz frequency band, and the composite effect between the sensors is matched with soft magnetic materials to increase the magnetic field collection efficiency of the composite magnetic field sensor. The electric field sensor 1062 uses the LDYJ-G-001 chip, uses Ag / AgCl as a non-polarized electrode material to increase the electrode reaction rate, and uses a nested chopping technology to improve the noise performance of the electric field sensor 1062, and improves the accuracy of the sensor acquisition signal. The electric field sensor 1062 and the magnetic field sensor 1063 are connected to the signal conditioning circuit 1069.

[0030] The signal conditioning circuit 1069 includes signal amplification and signal filtering, and mainly amplifies and filters the data collected by the electric field sensor 1062 and the magnetic field sensor 1063, and plays the function of eliminating noise and interference in the collected signal and amplifying weak signals, so that the analog-to-digital conversion module 1064 can perform analog-to-digital conversion normally. The signal conditioning circuit is connected to the analog-to-digital conversion module 1064, the electric field sensor 1062 and the magnetic field sensor 1063.

[0031] See also Figure 2 As shown, the analog-to-digital conversion module 1064 uses the ADS1255 chip, which is used to perform analog-to-digital conversion on the collected signals of the electric field sensor 1062 and the collected signals of the magnetic field sensor 1063 processed by the signal conditioning circuit 1069, and converts the electric field signal into a two-component signal and the magnetic field signal into a three-component signal through the characteristics of multi-channel acquisition, and then transmits the processed signals to the data preliminary processing device 1061. The CS port of the analog-to-digital conversion module is connected to PA4 of the single-chip microcomputer, the SCLK port is connected to PA5 of the single-chip microcomputer, the DOUT port is connected to PA6 of the single-chip microcomputer, and the DIN port is connected to PA7 of the single-chip microcomputer.

[0032] See also Figure 2 As shown, the positioning module 1065 is used to record the location information of the acquisition terminal and transmit it to the single-chip microcomputer 1061. The ATK-1218-BD chip that can simultaneously receive Beidou and GPS satellite signals of two frequency bands can avoid the problem of poor satellite signals in a single frequency band and quickly and accurately obtain location information. The RXD port of the positioning module is connected to PA2 of the single-chip microcomputer, and the TXD port is connected to PA3 of the single-chip microcomputer.

[0033] See also Figure 2 As shown, the acquisition monitoring module 1067 uses a MAX706AT single-chip monitoring circuit chip, and its WDI terminal is connected to PA0 of the single-chip microcomputer. The end is connected to the NRST of the microcontroller.

[0034] See also Figure 4 As shown, the detection circuit in the acquisition monitoring module 1067 is connected as follows: a MAX706AT chip is used as the main detection chip, a 3.3V power supply is connected to the VCC terminal of the MAX706AT chip to ensure the normal power supply of the chip, the GND terminal is grounded to ensure that the ground terminal of the chip is normal, and the WD I terminal receives the high and low levels output by the PA0 terminal of the single-chip microcomputer to perform signal monitoring operations. When the signal is abnormal, it can be detected by The terminal sends a signal to the NRST terminal of the microcontroller to reset it automatically. Switch S1 is connected to ensure manual reset operation, and the right end of switch S1 is connected to JMP2 through a diode, and JMP2 is then connected to the port. Diode D2 ensures unidirectional flow of signals.

[0035] See also Figure 2 As shown, the storage module 1068 includes an external expansion SRAM, using the IS62WV51216 chip, wherein A0-A4 are connected to PF1-PF5 of the single-chip microcomputer 1061, A10-A5 are connected to PF12-PG1 of the single-chip microcomputer 1061, A11 is connected to PF0 of the single-chip microcomputer 1061, A18 is connected to PG2 of the single-chip microcomputer 1061, and A14-A12 are connected to PG3-PG5 of the single-chip microcomputer 1061 , A15-A17 are connected to PD11-PD13 of the microcontroller 1061, I / O0-I / O15 are connected to FSMC_D0-FSMC_D15 of the microcontroller 1061, UB is connected to PE1 of the microcontroller 1061, LB is connected to PE0 of the microcontroller 1061, OE is connected to PD4 of the microcontroller 1061, and WE is connected to PD5 of the microcontroller 1061, thereby expanding the storage space for the microcontroller 1061.

[0036] See also Figure 3 As shown, the data preliminary processing device 103 includes a second wireless communication module 1033 connected to the first wireless communication module 1066 of the acquisition terminal 104 for bidirectional data communication, a third wireless communication module 1032 for data communication with the centralized storage and processing device 102, and a microcontroller 1031 connected to the second wireless communication module 1033 and the third wireless communication module 1032. The microcontroller 1031 adopts a Raspberry Pi 4B.

[0037] Furthermore, the first wireless communication module 1066 and the second wireless communication module 1033 both adopt the NB-loT wireless communication module BC26, and the third wireless communication module 1032 is the 5G communication module RM500Q-GL.

[0038] See also Figure 2 and Figure 3 As shown, the RXD port of the first wireless communication module 1066 is connected to PA9 of the single-chip computer 1061, the TXD port of the first wireless communication module 1066 is connected to PA10 of the single-chip computer 1061, the second wireless communication module 1033 is connected to the microcontroller 1031 through the UART port, and the third wireless communication module 1032 is connected to the microcontroller 1031 through the USB3.0 port.

[0039] See also Figure 1As shown, the centralized storage and processing device 102 is connected to the terminal 101 and the data preliminary processing device 103, and the centralized storage and processing device 102 uses a remote computer to implement functions.

[0040] See also Figure 1 As shown, the terminal 101 is a mobile device, such as a mobile phone, to implement functions, and is connected to the centralized storage and processing device 102 for communication.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetotelluric data acquisition and transmission system, characterized in that: include: Multiple acquisition terminals, each acquisition terminal is connected to a data preliminary processing device, all data preliminary processing devices are connected to a centralized storage processing device through a network, and the centralized storage processing device is connected to the terminal; wherein the acquisition terminal includes a single-chip microcomputer, a magnetic field sensor, an electric field sensor, a first wireless communication module, an analog-to-digital conversion module, an acquisition monitoring module, a positioning module, a storage module and a signal conditioning circuit, the first wireless communication module, the analog-to-digital conversion module, the acquisition monitoring module, the storage module, the positioning module are connected to the single-chip microcomputer, the electric field sensor and the magnetic field sensor are connected to the signal conditioning circuit, and the signal conditioning circuit is connected to the analog-to-digital conversion module.

2. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The microcontroller selects STM32F103ZET6 as the preliminary data processing device, and the FT232R chip is selected as the USB to serial port.

3. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The magnetic field sensor is composed of an inductive magnetic field sensor chip MC-50 and a fluxgate magnetic field sensor chip DRV421, and the electric field sensor is composed of a LDYJ-G-001 chip with Ag / AgCl as a non-polarized electrode material.

4. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The analog-to-digital conversion module uses the ADS1255 chip to receive low-level input signals directly from the sensor.

5. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The positioning module uses the ATK-1218-BD chip which can simultaneously receive signals from both Beidou and GPS satellite frequency bands.

6. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The acquisition monitoring module uses a MAX706AT single-chip monitoring circuit chip.

7. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The storage module contains external expansion SRAM and uses the IS62WV51216 chip.

8. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The data preliminary processing device includes a second wireless communication module for bidirectional data communication connection with the first wireless communication module of the acquisition terminal, a third wireless communication module for data communication with the centralized storage and processing device, and a microcontroller Raspberry Pi 4B connecting the second wireless communication module and the third wireless communication module.

9. The magnetotelluric data acquisition and transmission system according to claim 6, characterized in that: The first wireless communication module and the second wireless communication module both use the NB-loT wireless communication module BC26, and the third wireless communication module is the 5G communication module RM500Q-GL.

10. The magnetotelluric data acquisition and transmission system according to claim 1, characterized in that: The centralized storage and processing device adopts a remote computer, and the terminal adopts a mobile device.

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