Three-dimensional directional transient electromagnetic detection device and method for mining borehole

Patent metadata

Field	Value
Publication number	US-10845503-B2
Application number	US-201816132505-A
Country	US
Kind code	B2
Filing date	Sep 17, 2018
Priority date	Sep 21, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

Disclosed is a three-dimensional directional transient electromagnetic advanced detection device, wherein the CPU and the bus communication end of the transient electromagnetic transmitting module are both connected to the system bus, the signal output end of the transient electromagnetic transmitting module is connected to the transient electromagnetic transmitting coil outside the borehole to be detected, the signal input end of the electromagnetic signal receiving module is connected to the signal output ends of the three-dimensional magnetic field sensor and the one-dimensional Z-directional electric field sensor, the signal output end of the electromagnetic signal receiving module is connected to the electromagnetic signal input end of the SCM, the communication end of the first memory is connected to the data storage end of the SCM, the communication end of the three-dimensional electronic compass is connected to the compass signal communication end of the SCM, the host data communication of the SCM is connected to the second optical cable port of the local host through the first optical cable port and the optical cable. The device can detect harmful geological bodies such as aquifer and water-conducting channels and make a intensive and effective detection forecast.

First claim

The invention claimed is:

1. A three-dimensional directional transient electromagnetic advanced detection device for mining borehole, wherein the device comprises a local host ( 1 ), a probe ( 2 ), an optical cable ( 3 ), an electromagnetic transmitting coil ( 6 ), wherein the probe ( 2 ) comprises: a three-dimensional magnetic field sensor ( 2 , 1 ), a one-dimensional Z-directional electric field sensor ( 2 . 2 ), an electromagnetic signal receiving circuit ( 2 . 3 ), a SCM ( 2 . 4 ), a first optical cable port ( 2 . 5 ), a first memory ( 2 . 6 ), and a three-dimensional electronic compass ( 2 . 7 ), and the local host ( 1 ) comprises a CPU ( 1 . 1 ), a system bus ( 1 . 5 ) and a transient electromagnetic transmitting circuit ( 1 . 7 ), wherein the CPU ( 1 . 1 ) and the bus communication end of the transient electromagnetic transmitting circuit ( 1 . 7 ) are connected to the system bus ( 1 . 5 ), the signal output end of the transient electromagnetic transmitting circuit ( 1 . 7 ) is connected to the transient electromagnetic transmitting coil ( 6 ) outside the borehole ( 5 ) to be detected, the signal input end of the electromagnetic signal receiving circuit ( 2 . 3 ) is connected to the signal output ends of the three-dimensional magnetic field sensor ( 2 . 1 ) and the one-dimensional Z-directional electric field sensor ( 2 . 2 ), the signal output end of the electromagnetic signal receiving circuit ( 2 . 3 ) is connected to the electromagnetic signal input end of the SCM ( 2 . 4 ), the communication end of the first memory ( 2 . 6 ) is connected to the data storage end of the SCM ( 2 . 4 ), the communication end of the three-dimensional electronic compass ( 2 . 7 ) is connected to the compass signal communication end of the SCM ( 2 . 4 ), the host data communication of the SCM ( 2 . 4 ) is connected to the second optical cable port ( 1 . 6 ) of the local host ( 1 ) through the first optical cable port ( 2 . 5 ) and the optical cable ( 3 );
wherein the transient electromagnetic transmitting coil ( 6 ) is configured to transmit a pulse transient electromagnetic signal to the borehole ( 5 ) to be detected under the control of the transient electromagnetic transmitting circuit ( 1 . 7 ) and the CPU ( 1 . 1 ), the one-dimensional Z-directional electric field sensor ( 2 . 2 ) of the probe ( 2 ) is configured to receive the electromagnetic direct signal in the pulse transient electromagnetic signal emitted by the transient electromagnetic transmitting coil ( 6 ) and the Z-directional secondary electric field signal of the rock mass around the borehole ( 5 ) to be detected excited by the pulse transient electromagnetic signal, the three-dimensional magnetic field sensor ( 5 ) is configured to receive the three-dimensional secondary magnetic field signal of the rock mass around the borehole to be detected excited by the pulsed transient electromagnetic signal and the three-dimensional electronic compass ( 2 . 7 ) is configured to measure the trajectory data of the probe ( 2 ) in the borehole ( 5 ) to be detected;
wherein the SCM ( 2 . 4 ) is configured to make the electromagnetic direct signal, the Z-directional secondary electric field signal of the rock around the borehole ( 5 ) to be detected excited by the pulse transient electromagnetic signal, and the three-dimensional secondary magnetic field signal of the rock mass around the borehole ( 5 ) to be detected excited by the pulse transient electromagnetic signal to be digitally processed to obtain the digital signal data of the electromagnetic direct signal, the Z-directional secondary electric field signal and the three-dimensional secondary magnetic field signal, and store the digital signal data of the electromagnetic direct signal, the Z-directional secondary electric field signal and the three-dimensional secondary magnetic field signal into the first memory ( 2 . 6 ) together with the trajectory data of the probe ( 2 ) in the borehole ( 5 ) to be detected obtained by the three-dimensional electronic compass ( 2 . 7 ); and
wherein the CPU ( 1 . 1 ) is configured to generate corresponding maps of the three-dimensional secondary magnetic field and the Z-directional secondary electric field and a borehole trajectory map, according to the digital signal data of the electromagnetic direct signal, the Z-directional secondary electric field signal and the three-dimensional secondary magnetic field signal and the trajectory data of the probe ( 2 ) in the borehole ( 5 ) to be detected.

2. The three-dimensional directional transient electromagnetic advanced detection device for mining borehole according to claim 1 , wherein the CPU ( 1 . 1 ) further comprises a second memory ( 1 . 2 ) and a human-machine interactive device ( 1 . 3 ), and the second memory ( 1 . 2 ) and the human-machine interactive device ( 1 . 3 ) are both connected to the system bus ( 1 . 5 ).

3. The three-dimensional directional transient electromagnetic advanced detection device for mining borehole according to claim 1 , wherein the casing of the probe ( 2 ) is formed by a PVC tube sealed with a plastic plug and the three-dimensional directions of the three-dimensional magnetic field sensor ( 2 . 1 ) are consistent with the directions of the three-dimensional electronic compass ( 2 . 7 ).

4. The three-dimensional directional transient electromagnetic advanced detection device for mining borehole according to claim 1 , wherein the three-dimensional magnetic field sensor ( 2 . 1 ) is composed of three magnetic field sensors of an X-axis magnetic field sensor ( 2 . 1 . 1 ), a Y-axis magnetic field sensor ( 2 . 1 . 2 ), and a Z-axis magnetic field sensor ( 2 . 1 . 3 ), respectively, for receiving the X, Y, Z directional magnetic field intensity.

5. The three-dimensional directional transient electromagnetic advanced detection device for mining borehole according to claim 1 , wherein the electromagnetic transmitting coil ( 6 ) is composed of a multi-turn cable ( 6 . 1 ) and a transmitting coil interface ( 6 . 2 ), and the electromagnetic transmitting coil ( 6 ) is wound into a square shape with a side length of 1.5-3 m or a circle shape with a diameter of 2-3 m.

6. A three-dimensional transient electromagnetic advanced detection method for mining borehole by using the device according to claim 1 , wherein the method comprises the steps of:
Step 1—disposing the electromagnetic transmitting coil ( 6 ) on the orifice plane of the borehole ( 5 ) to be detected in the roadway ( 7 ) wall, making the plane of the electromagnetic transmitting coil ( 6 ) perpendicular to the borehole ( 5 ) to be detected, making the axis of the borehole ( 5 ) to be detected coincide with the axis of the electromagnetic transmitting coil ( 6 ), and disposing the probe ( 2 ) into the borehole ( 5 ) to be detected;
Step 2—controlling the transient electromagnetic transmitting circuit ( 1 . 7 ) by using the CPU ( 1 . 1 ) to transmit a pulse transient electromagnetic signal to the borehole ( 5 ) to be detected through the transient electromagnetic transmitting coil ( 6 );
Step 3—receiving the electromagnetic direct signal in the pulse transient electromagnetic signal emitted by the transient electromagnetic transmitting coil ( 6 ) and the Z-directional secondary electric field signal of the rock mass around the borehole ( 5 ) to be detected excited by the pulse transient electromagnetic signal by using the one-dimensional Z-directional electric field sensor ( 2 . 2 ) of the probe ( 2 ), receiving the three-dimensional secondary magnetic field signal of the rock mass around the borehole ( 5 ) to be detected excited by the pulse transient electromagnetic signal by the three-dimensional magnetic field sensor ( 2 . 1 ), and measuring the trajectory data of the probe ( 2 ) in the borehole ( 5 ) to be detected by the three-dimensional electronic

Assignees

• Wuhan Changsheng Mine Security Tech Limited
• Univ China Mining

Inventors

• Wu Qiang
• Liu Liu
• Zeng Yifan
• Tao Fengjuan
• Liu Chunsheng

Classifications

• H04N23/555 Primary

  for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes · CPC title

• H04N23/698

  for achieving an enlarged field of view, e.g. panoramic image capture · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N7/185

  from a mobile camera, e.g. for remote control · CPC title

• G01V3/083 Primary

  Controlled source electromagnetic [CSEM] surveying · CPC title