Data acquisition method of node type transient electromagnetic instrument

Abstract

The invention discloses a node type transient electromagnetic instrument and a data acquisition method, and relates to the field of transient electromagnetic detection.The node type transient electromagnetic instrument comprises a shell, a compass arranged at the top of the shell, handle assemblies arranged on the two sides of the shell and a caudal vertebra arranged at the bottom of the shell; the interior of the shell is divided into a three-component weak magnetic sensor part, a mainboard part and a power supply part from top to bottom through the layering partition plates. A three-component magnetoelectric weak magnetic sensor is arranged in the three-component weak magnetic sensor part; the mainboard part comprises an MCU mainboard which integrates an A / D converter, a Beidou time service positioning system, a storage system and a wireless communication system. The power supply part comprises a lithium battery device and a battery management system (BMS). By the adoption of the structure, full-space and full-time continuous collection is achieved, and collection of a large amount of transient electromagnetic data is achieved in a large range.

Description

Technical Field

[0001] The invention relates to the field of transient electromagnetic detection, and in particular to a node-type transient electromagnetic instrument and a data acquisition method. Background Art

[0002] The transient electromagnetic data transmitting device includes a generator, a transmitter and a transmitting wire, and the receiving device includes a receiver and a magnetic induction probe. In actual construction, after the transmitting device is arranged, a single-component or three-component magnetic probe is usually used to connect the receiver to detect the electromagnetic field changes of the horizontal or vertical components of a single measuring point. The receiving device and the transmitting device are synchronized by GPS or crystal oscillator to ensure accurate collection of the pure secondary field generated by the underground medium when separated. The data collector holds the receiving device to collect data along the measuring line and measuring points. After the single-point data measurement is completed, the next measuring point measurement is carried out.

[0003] Under complex terrain conditions and when high-resolution, high-density and large-scale data detection requirements are required, the traditional single-point reception method of transient electromagnetic is difficult to achieve efficient and stable three-dimensional acquisition. It is easily interfered by terrain and human factors, resulting in poor signal resolution, and has problems such as low efficiency, large interference and poor signal stability. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a node-type transient electromagnetic instrument and a data acquisition method. The node-type transient electromagnetic instrument is an integrated receiving device, which no longer requires a manual handheld receiver and a receiving probe for single-point measurement. The node-type transient electromagnetic instrument can be independently deployed and data collected. A more flexible, more complete and more targeted irregular observation system is designed for specific geological targets and surface conditions. The number of survey lines can be flexibly increased, and the measurement points can be flexibly encrypted as needed, which is beneficial to improving the quality of transient electromagnetic data and improving exploration results.

[0005] To achieve the above object, the present invention provides a node-type transient electromagnetic instrument, comprising a housing, a compass arranged on the top of the housing, handle assemblies arranged on both sides of the housing and a tail cone arranged at the bottom of the housing, wherein the interior of the housing is divided from top to bottom into a three-component weak magnetic sensor part, a main board part and a power supply part by a layered partition;

[0006] A three-component magnetoelectric weak magnetic sensor is arranged in the three-component weak magnetic sensor part;

[0007] The mainboard part includes an MCU mainboard that integrates an A / D converter, Beidou timing and positioning system, storage system, and wireless communication system;

[0008] The power supply part includes a lithium battery device and a battery management system BMS.

[0009] Preferably, the compass indicates the direction of the magnetic meridian through a magnetic needle, and determines the direction of the target relative to the magnetic meridian in conjunction with the reading of the dial, and the compass has a built-in level.

[0010] Preferably, an anti-slip belt is provided in the middle of the handle assembly.

[0011] A data acquisition method for a node-type transient electromagnetic instrument, wherein the node-type transient electromagnetic instrument is evenly arranged on the ground of a measurement area according to a certain measurement network density, and a transient electromagnetic signal is continuously emitted at a certain position on the ground of the measurement area, specifically comprising the following steps:

[0012] S1: Design the observation system according to the specific geological targets and surface conditions, and determine the correct placement and operation of each node transient electromagnetic instrument;

[0013] S2: Use transient electromagnetic transmission system to transmit signals;

[0014] S3: The node-type transient electromagnetic instrument works together, the three-component magnetoelectric weak magnetic sensor obtains the three-component magnetic field data, the A / D converter converts the magnetic field data into a digital signal, obtains the spatiotemporal data according to the Beidou satellite signal, stores the spatiotemporal data and uploads the spatiotemporal data through the cellular communication network;

[0015] S4: The mobile terminal can check the operation status of the node-type transient electromagnetic instrument in real time and obtain the observation data in the measurement area. After downloading the observation data, different algorithms are used for data processing to complete data collection.

[0016] Preferably, a threaded column is provided at the top end of the coccyx to be fixed with the housing.

[0017] Therefore, the present invention adopts the above-mentioned node-type transient electromagnetic instrument data and acquisition method, which has the following characteristics:

[0018] Beneficial effects:

[0019] (1) The compass of the present invention has a built-in level. By adjusting the compass to center the bubble in the level, the compass is ensured to be in a horizontal state, and accurate horizontal measurement can be performed.

[0020] (2) The handle assembly, shell and tail vertebrae of the present invention are all made of PBT material, which has corrosion resistance and weather resistance. The fixed parts in the handle assembly can withstand an external force four times of their weight. The position is easy to insert into the ground, and the combination with the stratum is strong and has good coupling. It is not easy to shake left and right, tilt or fall out.

[0021] (3) The battery management system BMS in the present invention monitors the status of the lithium battery device, including voltage, current, temperature, etc., and implements multiple protections such as overvoltage and undervoltage protection, overcurrent and short circuit protection, and overheating protection through the BMS to improve system reliability.

[0022] (4) The node-type transient electromagnetic instrument in the present invention stores and uploads the instrument operation status, Beidou time and space information, and the received three-component magnetic field signal to the server, observes the instrument status in real time on the mobile terminal, downloads the original data, and performs further processing and research.

[0023] (5) In the present invention, the instrument obtains high-precision space-time signals through Beidou satellites, and uploads the stored data through 4G or 5G wireless communication.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a process flow of a node-type transient electromagnetic instrument data acquisition method of the present invention;

[0026] Figure 2 It is a structural diagram of a node-type transient electromagnetic instrument of the present invention;

[0027] Figure 3 It is an enlarged view of the interior of a shell in a node-type transient electromagnetic instrument of the present invention;

[0029] 1. Compass; 2. Handle assembly; 3. Tail vertebrae; 4: Shell; 5: Three-component magnetoelectric weak magnetic sensor; 6. MCU mainboard; 7. Layered partition; 8. Lithium battery device. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0031] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0032] The words "include" or "comprises" and the like used in the present invention mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements. The orientation or position relationship indicated by the terms "inside", "outside", "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. When the absolute position of the described object changes, the relative position relationship may also change accordingly. In the present invention, unless otherwise clearly specified and limited, the terms "attachment" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example

[0034] A node-type transient electromagnetic instrument comprises a housing 4, a compass 1 arranged on the top of the housing 4, handle assemblies 2 arranged on both sides of the housing 4 and a tail vertebra 3 arranged at the bottom of the housing 4, such as Figure 3 As shown, the interior of the housing 4 is divided from top to bottom into a three-component weak magnetic sensor part, a main board part, and a power supply part by a layered partition 7; the layered partition 7 ensures that each part operates independently, reduces mutual interference, provides structural support, and protects the components of the main board part and the power supply part from physical shock and vibration. The layered partition 7 can also serve as part of thermal management to help disperse and isolate the heat generated by different layers.

[0035] The three-component weak magnetic sensor part is provided with a three-component magnetoelectric weak magnetic sensor 5, which can measure the three components of the magnetic field (X, Y, Z axis) and has the characteristics of high sensitivity, large bandwidth, large range and low power consumption;

[0036] The main board includes an MCU main board 6 that integrates an A / D converter, Beidou timing and positioning system, storage system, and wireless communication system; the Beidou satellite navigation system provides high-precision positioning, navigation, and timing services around the world all day and all weather, ensuring the system's time accuracy and the reliability of location information. The storage system is responsible for storing programs and data. Figure 2The storage device is an SD card, and you can also use a TF card, CF card, EMMC or SSD, etc. to store MCU firmware, runtime data, Beidou satellite space-time data, and three-component magnetic field signals. The storage system allows information to continue in time without disappearing. 4G and 5G communication systems provide high-speed data transmission capabilities, allowing the MCU motherboard to communicate quickly with remote servers, other devices or the Internet. In the event that the cellular network is unavailable, the Beidou satellite can be used as a backup channel to relay communication with the cellular mobile communication network to ensure the continuity and reliability of data transmission;

[0037] The power supply part includes a lithium battery device 8 and a battery management system BMS, which monitors the status of the lithium battery device, including voltage, current, temperature, etc., and implements multiple protections such as overvoltage and undervoltage protection, overcurrent and short circuit protection, and overheating protection through BMS to improve system reliability.

[0038] The compass 1 indicates the direction of the magnetic meridian through the magnetic needle, and the direction of the target relative to the magnetic meridian is determined in conjunction with the reading of the dial. The compass 1 has a built-in level. By adjusting the compass 1, the bubble in the level is centered to ensure that the compass 1 is in a horizontal state, so that accurate horizontal measurement can be performed.

[0039] An anti-slip belt is provided in the middle of the handle assembly 2 to avoid accidents during the lifting process.

[0040] The top of the tail vertebra 3 is provided with a threaded column which cooperates with the shell 4 and is made of PBT material. The vertebral structure is easy to insert into the ground, has strong bonding strength with the stratum, good coupling, and is not easy to shake left and right, tilt or fall out.

[0041] like Figure 1 As shown, a data acquisition method for a node-type transient electromagnetic instrument is provided. The node-type transient electromagnetic instrument is evenly arranged on the ground of the measurement area according to a certain measurement network density, and the transient electromagnetic signal is continuously emitted at a certain position on the ground of the measurement area. The node-type transient electromagnetic instrument is small and light, flexible in deployment, and compatible with the characteristics of different transient electromagnetic emission systems. Each receiver is independently deployed according to the designed measurement point, which can flexibly increase the number of measurement lines and flexibly encrypt the measurement points as needed. Specifically, the following steps are included:

[0042] S1: Design the observation system according to the specific geological targets and surface conditions, determine the correct placement and operation of each node-type transient electromagnetic instrument, ensure that the instrument points in the same direction and is placed horizontally according to the compass, and ensure that the tail vertebra is successfully immersed in the ground and the instrument is stable without shaking, tilting or falling out;

[0043] S2: Use the transient electromagnetic transmission system to transmit signals. Select an appropriate transient electromagnetic transmission system according to the surface topography and human environment to ensure that the transmitted signal covers the measurement area and has sufficient energy so that the node-type transient electromagnetic instrument can receive it normally.

[0044] S3: The node-type transient electromagnetic instrument works together, the three-component magnetoelectric weak magnetic sensor obtains the three-component magnetic field data, the A / D converter converts the magnetic field data into a digital signal so that the MCU can process it, obtains the spatiotemporal data according to the Beidou satellite signal, stores the spatiotemporal data and uploads the spatiotemporal data to the database through the cellular communication network;

[0045] S4: The mobile terminal accesses the database to view the operation status of the node-type transient electromagnetic instrument in real time and obtain the observation data in the measurement area. After downloading the observation data, different algorithms are used for data processing to complete data collection.

[0046] Comparative Example

[0047] In traditional transient electromagnetic detection, the receiver and transmitter use crystal oscillator synchronization or GPS synchronization. When the distance is far and the exploration range is wide, crystal oscillator synchronization is generally used. As the detection time increases, the frequency drift of the crystal oscillator on the receiver will lead to significant time error accumulation, which also affects the data quality. The node-type transient electromagnetic instrument performs full-time collection and realizes accurate time synchronization of data collection based on the Beidou satellite BDS timing technology.

[0048] Traditional transient electromagnetic detection data needs to be downloaded from the receiver after construction is completed before the measured data can be processed and analyzed, and the coordinates and elevation information of each measuring point need to be obtained manually. The delayed and cumbersome data acquisition greatly affects the construction efficiency. The node-type transient electromagnetic instrument has a built-in large-capacity storage device (SD card, TF card, CF card, EMMC or SSD) and an external memory interface to store a large amount of transient electromagnetic data. According to the Beidou satellite precise positioning technology, accurate spatial positioning of data acquisition is achieved.

[0049] The node-type transient electromagnetic instrument has a built-in wireless communication module, which can upload the instrument's operating status, spatiotemporal data and three-component magnetic field data to the base station in real time. The mobile terminal can view the instrument's operating status and download observation data in real time.

[0050] The node-type transient electromagnetic instrument has a built-in lithium battery device to provide power for each functional unit. This battery can work continuously and autonomously, supporting the collection of transient electromagnetic data for ten days or even longer without the need to frequently replace the power supply module.

[0051] Therefore, the present invention adopts the above-mentioned node-type transient electromagnetic instrument and data acquisition method, which can be independently deployed and collected for data, and a more flexible, more complete and more targeted irregular observation system can be designed for specific geological targets and surface conditions. It can not only flexibly increase the number of survey lines, but also flexibly encrypt the measurement points as needed, which is beneficial to improving the quality of transient electromagnetic data and improving the exploration effect.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A node-type transient electromagnetic instrument, characterized in that: It includes a shell, a compass arranged on the top of the shell, handle assemblies arranged on both sides of the shell and a tail cone arranged at the bottom of the shell, and the inside of the shell is divided from top to bottom into a three-component weak magnetic sensor part, a main board part and a power supply part through a layered partition; A three-component magnetoelectric weak magnetic sensor is arranged in the three-component weak magnetic sensor part; The mainboard part includes an MCU mainboard that integrates an A / D converter, Beidou timing and positioning system, storage system, and wireless communication system; The power supply part includes a lithium battery device and a battery management system BMS.

2. A node-type transient electromagnetic instrument according to claim 1, characterized in that: The compass indicates the direction of the magnetic meridian through the magnetic needle, and combined with the reading of the dial, determines the direction of the target relative to the magnetic meridian. The compass has a built-in level.

3. A node-type transient electromagnetic instrument according to claim 1, characterized in that: An anti-slip belt is arranged in the middle of the handle assembly.

4. A data acquisition method for a node-type transient electromagnetic instrument as described in any one of claims 1 to 3, characterized in that: The node-type transient electromagnetic instrument is evenly arranged on the ground of the measurement area according to a certain measurement network density, and the transient electromagnetic signal is continuously emitted at a certain position on the ground of the measurement area, which specifically includes the following steps: S1: Design the observation system according to the specific geological targets and surface conditions, and determine the correct placement and operation of each node transient electromagnetic instrument; S2: Use transient electromagnetic transmission system to transmit signals; S3: The node-type transient electromagnetic instrument works together, the three-component magnetoelectric weak magnetic sensor obtains the three-component magnetic field data, the A / D converter converts the magnetic field data into a digital signal, obtains the spatiotemporal data according to the Beidou satellite signal, stores the spatiotemporal data and uploads the spatiotemporal data through the cellular communication network; S4: The mobile terminal can check the operation status of the node-type transient electromagnetic instrument in real time and obtain the observation data in the measurement area. After downloading the observation data, different algorithms are used for data processing to complete data collection.

5. A node-type transient electromagnetic instrument according to claim 1, characterized in that: The top end of the coccyx is provided with a threaded column which is matched and fixed with the shell.

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