Mine transient electromagnetic detection method and system based on mining superconducting magnetometer

Abstract

The invention relates to a mine transient electromagnetic detection method and system based on a mine superconducting magnetometer, and belongs to the technical field of mine transient electromagnetic exploration. The device comprises a mining transient electromagnetic instrument, a mining superconducting magnetometer, a transmitting antenna and an antenna bracket, wherein the mining transient electromagnetic instrument consists of a control unit, a transmitting unit, a receiving unit and an explosion-proof protection power supply; the mining superconducting magnetometer is composed of a superconducting quantum interference device, a small non-magnetic Dewar, a signal detection unit and an explosion-proof protection power supply. The mining transient electromagnetic instrument, the mining superconducting magnetometer and the transmitting antenna are movably connected in pairs. The mining superconducting magnetometer is adopted to measure mining transient electromagnetic total magnetic field and secondary magnetic field signals, the characteristic of high sensitivity of the superconducting magnetometer to weak magnetic signals is utilized, the mining power supply multi-stage protection technology is combined, the effective length of the secondary field signals collected by mine transient electromagnetism is increased, the detection depth is increased, and the detection accuracy is improved. And safe use of the instrument in the underground coal mine is ensured, and great practical application significance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a mine transient electromagnetic detection method and system based on a mine superconducting magnetometer, and belongs to the technical field of mine transient electromagnetic prospecting. BACKGROUND

[0002] The current mine transient electromagnetic method is a method of transmitting a primary pulse magnetic field to the front of the heading face, the inside of the roof and floor, and the inside of the mining face by a non-grounded loop, and receiving a secondary field caused by coal and rock during the intermittent period of the primary pulse magnetic field by a receiving coil or a magnetic probe. The method is mainly used for water body disaster detection in coal mines.

[0003] The existing mine transient electromagnetic method mainly uses a multi-turn air coil or a magnetic core probe to receive the change rate of the secondary magnetic induction intensity, and has problems such as fast decay speed, short effective time, and shallow detection depth. At the same time, the existing ground superconducting magnetometer is not explosion-proof, and cannot be directly used for underground transient electromagnetic detection in coal mines.

[0004] Through the above analysis, the problems and defects of the prior art are that the existing mine transient electromagnetic detection device has problems such as fast decay speed, short effective time, and shallow detection depth. At the same time, the existing ground superconducting magnetometer is not explosion-proof, and cannot be directly used for underground transient electromagnetic detection in coal mines. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a mine transient electromagnetic detection method and system based on a mine superconducting magnetometer. The present application uses the high sensitivity characteristics of the superconducting magnetometer to weak magnetic signals, combines mine power multi-level protection technology, improves the effective length of the secondary field signal collected by the mine transient electromagnetic method, improves the detection depth, and directly measures the total magnetic field and the secondary magnetic field of the mine transient electromagnetic method after multi-level voltage and multi-level current protection, thereby improving the accuracy and efficiency of the detection.

[0006] The technical scheme of the present application is as follows: in a first aspect, the present application provides a mine transient electromagnetic detection method based on a mine superconducting magnetometer, which comprises:

[0007] S1: pour liquid nitrogen or liquid helium into a small non-magnetic Dewar 11 for cooling a superconducting quantum interference device 12 in the small non-magnetic Dewar 11, and seal the Dewar port;

[0008] S2: assemble an X-shaped detachable antenna support 10, install a transmitting antenna 9 on the antenna support 10, and install the small non-magnetic Dewar 11 on the antenna support 10;

[0009] S3: connecting the superconducting quantum interference device signal line to the mine superconducting magnetometer host computer, connecting the mine superconducting magnetometer host computer signal line to the mine transient electromagnetic instrument host computer, and connecting the small multi-turn square transmitting antenna signal line to the mine transient electromagnetic instrument host computer;

[0010] S4: turning on the mine transient electromagnetic instrument explosion-proof protection power supply 4 and the mine superconducting magnetometer explosion-proof protection power supply 8, and setting the transmission and collection parameters in the instrument operation interface;

[0011] S5: when the transmitting antenna 9 rotates or moves to the appointed measuring point, the transmitting unit 2 of the mine transient electromagnetic instrument 5 outputs the positive and negative intermittent alternating square wave or trapezoidal wave current set in S4 to the transmitting antenna 9;

[0012] S6: after the square wave or trapezoidal wave current is turned off in S5, the mine superconducting magnetometer 6 receives the magnetic field signal, which is output to the mine transient electromagnetic instrument 5 after signal processing, and is collected by the receiving unit;

[0013] S7: continue to perform S5 to S6 steps until the number of superpositions set in S4 is completed.

[0014] Further, the superconducting quantum interference device 12 is installed in the center of the antenna support 10 after being placed in the small non-magnetic Dewar 11, and constitutes a central loop together with the transmitting antenna 9.

[0015] Further, the mine superconducting magnetometer 6 receiving the magnetic field signal includes receiving the total magnetic field signal and the secondary magnetic field signal generated by the front stratum by using the mine superconducting magnetometer 6.

[0016] Further, the mine superconducting magnetometer 6 includes a superconducting quantum interference device 12, a small non-magnetic Dewar 11, a signal detection unit 7 and a first explosion-proof power supply; the first explosion-proof power supply includes a mine battery, a multi-stage current protection circuit and a multi-stage voltage protection circuit.

[0017] The second aspect, another object of the present application is to provide a mine transient electromagnetic detection system based on mine superconducting magnetometer for the method of the first aspect, the system comprises:

[0018] The mine transient electromagnetic instrument 5 is used for mine transient electromagnetic detection;

[0019] The mine superconducting magnetometer 6 is used for total magnetic field and secondary magnetic field receiving;

[0020] The transmitting antenna 9 is used for transmitting primary field signal;

[0021] The antenna support 10 is used for supporting the transmitting antenna and installing the small non-magnetic Dewar 11;

[0022] The mine transient electromagnetic instrument 5, the mine superconducting magnetometer 6 and the transmitting antenna 9 are connected in pairs.

[0023] Further, the mine transient electromagnetic instrument 5 comprises a control unit 1, and

[0024] The transmitting unit 2 is used for square wave or trapezoidal wave current transmission.

[0025] The receiving unit 3 is used for total magnetic field and secondary magnetic field signal collection and processing.

[0026] The explosion-proof power supply 4 in the mine transient electromagnetic instrument is used for multi-stage protection of the voltage and current of the mine transient electromagnetic instrument 5.

[0027] Further, the mine superconducting magnetometer 6 comprises:

[0028] The superconducting quantum interference device 12 is used for total magnetic field and secondary magnetic field signal reception.

[0029] The small non-magnetic Dewar 11 is used for cooling the superconducting quantum interference device 12 after loading liquid helium or liquid nitrogen;

[0030] The signal detection unit 7 is used for control and signal reading and output of the mine superconducting magnetometer 6.

[0031] The explosion-proof protection power supply 8 of the mine superconducting magnetometer is used for multi-stage protection of the voltage and current of the mine superconducting magnetometer 6.

[0032] In a third aspect, another object of the present application is to provide an information data processing terminal for realizing the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0033] In a fourth aspect, another object of the present application is to provide a coal mine disaster-causing water body detection method using the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0034] In a fifth aspect, another object of the present application is to provide a coal mine underground transient electromagnetic detection method using the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0035] In combination with all the above technical solutions, the present application has the following advantages and positive effects:

[0036] 1. The present application uses a mine superconducting magnetometer to measure the total magnetic field and secondary magnetic field signals of the mine transient electromagnetic instrument, uses the high sensitivity characteristics of the superconducting magnetometer to weak magnetic signals, and combines the multi-stage protection technology of the mine power supply, thereby improving the effective length of the secondary field signal of the mine transient electromagnetic collection, improving the detection depth, ensuring the safe use of the instrument in the coal mine, and having great practical application significance.

[0037] 2, The application directly measures the total magnetic field and the secondary magnetic field of the mine transient electromagnetic field by using the high sensitivity characteristics of the superconducting magnetometer for weak magnetic signals, the secondary magnetic field H=k1t -3 / 2 , the traditional mine transient electromagnetic measurement is the secondary magnetic induction signal, the magnetic induction intensity V=k2t -5 / 2 ; the decay speed of the secondary magnetic field is slower than that of the secondary, so the time of entering the noise area is later than that of entering the noise area, and the effective data is longer than that of the secondary magnetic induction intensity; at the same time, since it needs to be used in the explosion environment of the mine, the conventional ground superconducting magnetometer is not protected against explosion, and cannot be directly used in the mine, therefore, the application adopts multi-level voltage and multi-level current protection technology to protect the output voltage and current of the power supply of the superconducting magnetometer, and ensures the safe use of the instrument in the explosion environment of the mine.

[0038] 3, The application directly measures the total magnetic field and the secondary magnetic field of the mine transient electromagnetic field by using the high sensitivity characteristics of the superconducting magnetometer for weak magnetic signals after multi-level voltage and multi-level current protection, thereby improving the detection accuracy and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows, obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0040] Figure 1 is a structure schematic diagram of a mine transient electromagnetic detection system based on a mine superconducting magnetometer provided by the embodiments of the present application;

[0041] Figure 2 is a structure schematic diagram of a mine superconducting magnetometer explosion protection power supply provided by the embodiments of the present application;

[0042] Figure 3 is a flow chart of a mine transient electromagnetic detection method based on a mine superconducting magnetometer provided by the embodiments of the present application;

[0043] Figure 4 is a principle diagram of a mine transient electromagnetic detection method based on a mine superconducting magnetometer provided by the embodiments of the present application.

[0044] Figure 1 In the figure, 1 is a control unit, 2 is a transmitting unit, 3 is a receiving unit, 4 is a mine transient electromagnetic instrument explosion protection power supply, 5 is a mine transient electromagnetic instrument, 6 is a mine superconducting magnetometer, 7 is a signal detection unit, 8 is a mine superconducting magnetometer explosion protection power supply, 9 is a transmitting antenna, 10 is an antenna support, 11 is a small non-magnetic Dewar, and 12 is a superconducting quantum interference device. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0046] In view of the problems in the prior art, the present application provides a mine transient electromagnetic detection method and system based on a mine superconducting magnetometer, which will be described in detail below with reference to the drawings.

[0047] As shown in Figure 1 and Figure 2 , the mine transient electromagnetic detection system based on the mine superconducting magnetometer provided by the embodiments of the present application comprises a mine transient electromagnetic instrument 5, a mine superconducting magnetometer 6, a transmitting antenna 9 and an antenna support 10.

[0048] The mine transient electromagnetic instrument 5 is composed of a control unit 1, a transmitting unit 2, a receiving unit 3 and an explosion-proof power supply 4 in the mine transient electromagnetic instrument; the mine superconducting magnetometer 6 is composed of a superconducting quantum interference device 12, a small non-magnetic Dewar 11, a signal detection unit 7 and an explosion-proof protection power supply 8 of the mine superconducting magnetometer. The mine transient electromagnetic instrument 5, the mine superconducting magnetometer 6 and the transmitting antenna 9 are movably connected in pairs.

[0049] The mine transient electromagnetic instrument 5 is used for mine transient electromagnetic detection; the mine superconducting magnetometer 6 is used for total magnetic field and secondary magnetic field receiving; the transmitting antenna 9 is used for primary field signal transmission; the antenna support 10 is used for supporting the transmitting antenna and mounting the small non-magnetic Dewar 11; the transmitting unit 2 is used for square wave or trapezoidal wave current transmission; the receiving unit 3 is used for total magnetic field and secondary magnetic field signal collection and processing; the explosion-proof power supply 4 in the mine transient electromagnetic instrument is used for multi-stage protection of the voltage and current of the mine transient electromagnetic instrument 5. The superconducting quantum interference device 12 is used for total magnetic field and secondary magnetic field signal receiving; the small non-magnetic Dewar 11 is used for cooling the superconducting quantum interference device 12 after loading liquid helium or liquid nitrogen; the signal detection unit 7 is used for control and signal reading and output of the mine superconducting magnetometer 6; and the explosion-proof protection power supply 8 of the mine superconducting magnetometer is used for multi-stage protection of the voltage and current of the mine superconducting magnetometer 6.

[0050] As shown in Figure 3 , the mine transient electromagnetic detection method based on the mine superconducting magnetometer provided by the embodiments of the present application comprises the following steps.

[0051] S101: Pour liquid nitrogen or liquid helium into the small non-magnetic Dewar 11 to cool the superconducting quantum interference device 12 in the small non-magnetic Dewar 11, and seal the Dewar port.

[0052] S102: Assemble the X-shaped detachable antenna support 10, install the transmitting antenna 9 on the antenna support 10, and install the small non-magnetic Dewar 11 on the antenna support 10;

[0053] S103: Connect the superconducting quantum interference device signal line to the mine superconducting magnetometer host, connect the mine superconducting magnetometer host signal line to the mine transient electromagnetic instrument host, and connect the small multi-turn square transmitting antenna signal line to the mine transient electromagnetic instrument host;

[0054] S104: Turn on the mine transient electromagnetic instrument explosion-proof protection power supply 4 and the mine superconducting magnetometer explosion-proof protection power supply 8, and set the transmission and collection parameters on the instrument operation interface;

[0055] S105: When the transmitting antenna 9 rotates or moves to the designated measurement point, the transmitting unit 2 of the mine transient electromagnetic instrument 5 outputs the positive and negative intermittent alternating square wave or trapezoidal wave current set in S104 to the transmitting antenna 9;

[0056] S106: After the square wave or trapezoidal wave current is turned off in S105, the mine superconducting magnetometer 6 receives the magnetic field signal, which is output to the mine transient electromagnetic instrument 5 after signal processing, and is collected by the receiving unit;

[0057] S107: Continue the steps of S105 to S106 until the number of superpositions set in S104 is completed.

[0058] As a preferred, the superconducting quantum interference device 12 is installed in the center of the antenna support 10 after being placed inside the small non-magnetic Dewar 11, and constitutes a central loop with the transmitting antenna 9. During the off period of the transmitting current, the total magnetic field and the secondary magnetic field are received by the mine superconducting magnetometer, and the magnetic field signal is output to the mine transient electromagnetic instrument for collection.

[0059] As a preferred, in S106 and S107, the mine transient electromagnetic secondary magnetic field signal decay rate is lower than the secondary magnetic induction signal decay rate, and the mine superconducting magnetometer 6 is used to receive the total magnetic field and the secondary magnetic field signal generated by the front stratum by taking advantage of the high sensitivity of the superconducting magnetometer to weak magnetic signals, which prolongs the effective signal time and improves the detection distance and the resolution of the front water body.

[0060] As a preferred, the mine superconducting magnetometer 6 is composed of a superconducting quantum interference device 12, a small non-magnetic Dewar 11, a signal detection unit 7 (including conditioning and control), and a mine superconducting magnetometer explosion-proof protection power supply 8; wherein the mine superconducting magnetometer explosion-proof protection power supply 8 and the mine transient electromagnetic instrument explosion-proof protection power supply 4 are composed of a mine lithium battery, a lithium battery management circuit, a multi-stage current limiting protection circuit, a multi-stage voltage protection circuit, and a current interruption self-recovery circuit, which provide safe power output for the mine superconducting magnetometer and the mine transient electromagnetic instrument 5.

[0061] The embodiment of the present application also provides an information data processing terminal used for realizing the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0062] The embodiment of the present application also provides a coal mine disaster-causing water body detection method using the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0063] The embodiment of the present application also provides a coal mine underground transient electromagnetic detection method using the mine transient electromagnetic detection method based on the mine superconducting magnetometer.

[0064] The specific embodiment of the present application is described in detail above in combination with the drawings, but the present application is not limited to the above-mentioned embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A mine transient electromagnetic detection method based on a mine superconducting magnetometer, characterized in that: The method comprises: S1: pour liquid nitrogen or liquid helium into a small non-magnetic Dewar (11) for cooling a superconducting quantum interference device (12) in the small non-magnetic Dewar (11), and seal the Dewar port; S2: assemble an X-shaped detachable antenna support (10), install a transmitting antenna (9) on the antenna support (10), and install the small non-magnetic Dewar (11) on the antenna support (10); S3: connect the superconducting quantum interference device signal line to a mine superconducting magnetometer host, connect the mine superconducting magnetometer host signal line to a mine transient electromagnetic instrument host, and connect the small multi-turn square transmitting antenna signal line to the mine transient electromagnetic instrument host; S4: turn on the mine transient electromagnetic instrument explosion-proof power supply (4) and the mine superconducting magnetometer explosion-proof power supply (8), and set the transmission and collection parameters on the instrument operation interface; S5: when the transmitting antenna (9) rotates or moves to the designated measurement point, the transmitting unit (2) of the mine transient electromagnetic instrument (5) outputs the positive and negative intermittent alternating square wave or trapezoidal wave current set in S4 to the transmitting antenna (9); S6: after the square wave or trapezoidal wave current is turned off in S5, the mine superconducting magnetometer (6) receives the magnetic field signal, which is output to the mine transient electromagnetic instrument (5) after signal processing, and is collected by the receiving unit; S7: continue the steps of S5 to S6 until the number of superpositions set in S4 is completed.

2. The mine transient electromagnetic detection method based on the mine superconducting magnetometer according to claim 1, characterized in that: The superconducting quantum interference device (12) is installed in the center of the antenna support (10) after being placed inside the small non-magnetic Dewar (11), and constitutes a central loop with the transmitting antenna (9).

3. The mine transient electromagnetic detection method based on the mine superconducting magnetometer according to claim 1, characterized in that: The mine superconducting magnetometer (6) receiving the magnetic field signal includes receiving the total magnetic field signal and the secondary magnetic field signal generated by the front stratum by using the mine superconducting magnetometer (6).

4. The mine transient electromagnetic detection method based on the mine superconducting magnetometer according to claim 1, characterized in that: The mine superconducting magnetometer (6) comprises a superconducting quantum interference device (12), a small non-magnetic Dewar (11), a signal detection unit (7), and a first explosion-proof power supply; the first explosion-proof power supply comprises a mine battery, a multi-stage current protection circuit, and a multi-stage voltage protection circuit.

5. A mine transient electromagnetic detection system based on a mine superconducting magnetometer for use in the method of any one of claims 1 to 4, characterized in that, The system comprises: a mine transient electromagnetic instrument (5) for mine transient electromagnetic detection; a mine superconducting magnetometer (6) for total magnetic field and secondary magnetic field reception; a transmitting antenna (9) for primary field signal transmission; an antenna support (10) for supporting the transmitting antenna and installing the small non-magnetic Dewar (11); the mine transient electromagnetic instrument (5), the mine superconducting magnetometer (6), and the transmitting antenna (9) are connected in pairs.

6. The mine transient electromagnetic detection system based on the mine superconducting magnetometer of claim 5, characterized in that: The mine transient electromagnetic instrument (5) comprises a control unit (1), and a transmitting unit (2) for square wave or trapezoidal wave current transmission; a receiving unit (3) for total magnetic field and secondary magnetic field signal collection and processing; a first explosion-proof power supply for multi-stage protection of the voltage and current of the mine transient electromagnetic instrument (5).

7. The mine transient electromagnetic detection system based on the mine superconducting magnetometer of claim 5, characterized in that: The mine superconducting magnetometer (6) comprises: a superconducting quantum interference device (12) for total magnetic field and secondary magnetic field signal reception; a small non-magnetic Dewar (11) for loading liquid helium or liquid nitrogen to cool the superconducting quantum interference device (12); a signal detection unit (7) for control and signal reading and output of the mine superconducting magnetometer (6). The second explosion-proof power supply is used for multi-stage protection of voltage and current of the mine superconducting magnetometer (6).

8. An information data processing terminal, characterized by The information data processing terminal is used to realize the mine transient electromagnetic detection method based on the mine superconducting magnetometer according to any one of claims 1-4.

9. A method for detecting a disaster-causing water body in a coal mine, characterized in that, The coal mine disaster-causing water body detection method uses the mine transient electromagnetic detection method based on the mine superconducting magnetometer according to any one of claims 1-4.

10. A method of coal mine underground transient electromagnetic prospecting, characterised by, The coal mine underground transient electromagnetic detection method uses the mine transient electromagnetic detection method based on the mine superconducting magnetometer according to any one of claims 1-4.

Images