CN-120315043-B - Electromagnetic detection device, method and equipment

CN120315043BCN 120315043 BCN120315043 BCN 120315043BCN-120315043-B

Abstract

The embodiment of the disclosure provides an electromagnetic detection device, an electromagnetic detection method and electromagnetic detection equipment, wherein the electromagnetic detection device comprises a transmitting module, a receiving module, a position adjusting module and a turn number adjusting module, the transmitting module comprises an inner nested transmitting coil and an outer nested transmitting coil, the inner nested transmitting coil and the outer nested transmitting coil comprise an inner transmitting coil and an outer transmitting coil, winding directions are the same, a specific magnetic field area is formed, the receiving module comprises a receiving coil, when magnetic flux of the specific magnetic field area is not zero and the magnetic flux of the specific magnetic field area is adjusted to be zero through the magnetic flux adjusting module, a secondary field signal generated by an object to be detected is received, the magnetic flux adjusting module comprises at least one of the following steps, the position adjusting module is arranged on the transmitting module and provided with a sliding component, the receiving module is arranged on the sliding component, the sliding component slides along a direction perpendicular to a plane of the transmitting module, and the turn number adjusting module is arranged on the transmitting module and is provided with a turn number adjusting component, and the turn number of a working coil in the inner transmitting coil is adjusted through connecting different positions of the inner transmitting coil.

Inventors

BIAN LEIXIANG
JIN YUKAI
SHI HAOTIAN
XU ZHAN
HU JIE
LI WENYU
GUO HANLIN
Zhang Jiagun
DENG XIANQUAN

Assignees

南京理工大学

Dates

Publication Date: 20260512
Application Date: 20250327

Claims (10)

1. An electromagnetic detection apparatus, the apparatus comprising: the device comprises a transmitting module, a receiving module, a position adjusting module and a turn number adjusting module; the transmitting module comprises an inner nested transmitting coil and an outer nested transmitting coil, the inner nested transmitting coil comprises an inner transmitting coil and an outer transmitting coil, the winding directions of the inner transmitting coil and the outer transmitting coil are the same, and the inner transmitting coil and the outer transmitting coil are used for generating primary fields with opposite directions in the area between the inner transmitting coil and the outer transmitting coil when the same pulse current passes through, so that a specific magnetic field area is formed; The receiving module comprises a receiving coil, wherein the projection of the receiving coil on the plane of the transmitting module is completely positioned in the specific magnetic field area, and receives a secondary field signal generated by an object to be detected under the condition that the magnetic flux of the specific magnetic field area is not zero and is adjusted to be zero by an area magnetic flux adjusting module so as to acquire the appointed physical property of the object to be detected according to the secondary field signal, and the area magnetic flux adjusting module at least comprises one of the following components: the position adjustment module is positioned on the transmitting module and is provided with a sliding component, the receiving module is positioned on the sliding component, and the sliding component slides along the direction perpendicular to the plane of the transmitting module so as to adjust the position of the receiving module relative to the transmitting module; The turn number adjusting module is positioned on the transmitting module and is provided with a turn number adjusting component, the turn number adjusting component is used for adjusting the turn number of a working coil in the inner transmitting coil by connecting different positions of the inner transmitting coil, the working coil is a coil participating in a current loop when the transmitting module transmits current, and the turn number adjusting module is used for adjusting the magnetic flux of the specific magnetic field area to be zero by adjusting the turn number of the working coil in the inner transmitting coil.
2. The apparatus of claim 1, wherein the launch module further comprises a rail, the position adjustment module is coupled to the launch module by the rail, the position adjustment module further comprising a knob, a ball screw, a guide bar, and a slide rail; The knob is connected with the ball screw and drives the ball screw to rotate when rotated; The sliding assembly is installed on the sliding rail through the ball screw and the guide rod, the sliding rail slides on the guide rail of the transmitting module, and when the ball screw is rotated, the sliding assembly is driven to slide along the guide rod.
3. The device of claim 1, wherein the inner transmit coil is an insulated wire, an outer insulating sheath of the inner transmit coil has an opening, the turn adjusting assembly is a slip sheet, and the slip sheet is connected with the inner transmit coil through the opening; The sliding sheet moves along the inner transmitting coil and is connected with openings at different positions of the inner transmitting coil in the moving process so as to adjust the number of turns of the working coil in the inner transmitting coil.
4. The device of claim 1, wherein the inner transmitting coil is provided with a movable insulating block, and the turn number adjusting component is a buckle; The buckle is connected with different positions of the inner transmitting coil through the area between the movable insulating blocks in the process of moving the movable insulating blocks so as to adjust the number of turns of the working coil in the inner transmitting coil.
5. The apparatus of claim 1, further comprising a transmitter for transmitting a pulsed current to the transmitting module.
6. The apparatus of claim 5, wherein the signal inputs of the turn adjustment module are respectively coupled to the transmitter and the turn adjustment assembly.
7. An electromagnetic detection method applied to the device as claimed in any one of claims 1 to 6, characterized in that it comprises: Detecting whether the magnetic flux of the specific magnetic field area is zero or not, and obtaining a detection result; if the detection result is negative, performing an area magnetic flux adjustment operation according to the area magnetic flux adjustment module to adjust the magnetic flux of the specific magnetic field area to zero, wherein the area magnetic flux adjustment operation at least comprises one of sliding the sliding component on the position adjustment module, adjusting the positions of the turns adjustment component of the turns adjustment module and the inner transmitting coil; And acquiring the appointed physical attribute of the target to be detected according to a secondary field signal generated by the target to be detected and received by the receiving module in the specific magnetic field area with zero magnetic flux.
8. An electromagnetic detection apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program implementing the steps of the method of claim 7 when executed by the processor.
9. A computer-readable storage medium, wherein the computer-readable storage medium is for storing computer-executable instructions, the computer executable instructions, when executed by a processor, implement the steps of the method of claim 7.
10. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the steps of the method of claim 7.

Description

Electromagnetic detection device, method and equipment Technical Field The disclosure relates to the technical field of electromagnetic method detection, in particular to an electromagnetic detection device, an electromagnetic detection method and electromagnetic detection equipment. Background The electromagnetic method is a geophysical exploration technology based on electromagnetic induction principle, and the basic working principle is that a transmitting coil transmits pulse current, the current generates a pulse magnetic field, namely a primary field, the primary field propagates in space and encounters a low-resistance body, eddy current, namely induction current, is generated in the primary field, the induction current generates a magnetic field which decays with time, namely a secondary field, in space, then a receiving coil receives a secondary field signal, and the physical property and the spatial position of an underground electric medium are deduced according to the secondary field signal, so that the detection of the underground electric medium is realized. However, when the detection is performed by using the electromagnetic method, the receiving coil receives the primary field and the secondary field at the same time. Since the primary field signal amplitude is much larger than the secondary field signal, the secondary field signal is submerged in the primary field signal, resulting in a decrease in detection accuracy and shallow detection capability. The electromagnetic detection device based on the overlapping loop device, the central loop device or the dipole device which is commonly used at present does not solve the problem, so that the phenomenon of aliasing of a primary field and a secondary field occurs when the electromagnetic detection device which is commonly used at present is used for electromagnetic detection, and data received by a receiving coil at early stage cannot be used, so that the detection capability of a shallow layer is insufficient. Disclosure of Invention The embodiment of the disclosure provides an electromagnetic detection device, an electromagnetic detection method and electromagnetic detection equipment, which are used for solving the problem that the detection capability of a shallow layer is insufficient due to the fact that data received by a receiving coil in early stage cannot be used due to the fact that primary field and secondary field aliasing phenomenon occurs during electromagnetic detection in the related technology. In a first aspect, embodiments of the present disclosure provide an electromagnetic detection apparatus, the apparatus comprising: the device comprises a transmitting module, a receiving module, a position adjusting module and a turn number adjusting module; the transmitting module comprises an inner nested transmitting coil and an outer nested transmitting coil, the inner nested transmitting coil comprises an inner transmitting coil and an outer transmitting coil, the winding directions of the inner transmitting coil and the outer transmitting coil are the same, and the inner transmitting coil and the outer transmitting coil are used for generating primary fields with opposite directions in the area between the inner transmitting coil and the outer transmitting coil when the same pulse current passes through, so that a specific magnetic field area is formed; The receiving module comprises a receiving coil, wherein the projection of the receiving coil on the plane of the transmitting module is completely positioned in the specific magnetic field area, and receives a secondary field signal generated by an object to be detected under the condition that the magnetic flux of the specific magnetic field area is not zero and is adjusted to be zero by an area magnetic flux adjusting module so as to acquire the appointed physical property of the object to be detected according to the secondary field signal, and the area magnetic flux adjusting module at least comprises one of the following components: the position adjustment module is positioned on the transmitting module and is provided with a sliding component, the receiving module is positioned on the sliding component, and the sliding component slides along the direction perpendicular to the plane of the transmitting module so as to adjust the position of the receiving module relative to the transmitting module; The turn number adjusting module is positioned on the transmitting module and is provided with a turn number adjusting component, the turn number adjusting component is used for adjusting the turn number of a working coil in the inner transmitting coil by connecting different positions of the inner transmitting coil, the working coil is a coil participating in a current loop when the transmitting module transmits current, and the turn number adjusting module is used for adjusting the magnetic flux of the specific magnetic field area to be zero by adjusting the turn number of the w