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Transient electromagnetic detection apparatus and method of eliminating inductive disturbance

A detection device and transient electromagnetic technology, which is applied in the field of transient electromagnetic exploration, can solve the problems of detection blind spots, aggravated distortion, poor resolution and accuracy, etc., to eliminate the influence of coil mutual inductance, reduce the influence of mutual inductance, and enhance the magnetic field radiation effect

Pending Publication Date: 2018-05-08
ANHUI HUIZHOU GEOLOGY SECURITY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the influence of coil inductance interference often causes the transient electromagnetic measurement signal to be distorted and distorted, especially the early signal, and the early signal overshoot exacerbates the degree of distortion, so it is difficult to obtain the whole secondary field induction signal of the geological body , resulting in poor resolution and accuracy and detection blind spots

Method used

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  • Transient electromagnetic detection apparatus and method of eliminating inductive disturbance
  • Transient electromagnetic detection apparatus and method of eliminating inductive disturbance
  • Transient electromagnetic detection apparatus and method of eliminating inductive disturbance

Examples

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Embodiment 1

[0042] Such as figure 1 As shown, the transient electromagnetic detection device includes a coil device 1 and a frame carrier 2 .

[0043] The coil device 1 includes a double transmitting coil 3, a receiving coil 4 and a coil fixing frame 5; the double transmitting coil 3 is composed of two first transmitting coils 31 and a second transmitting coil 32 which are parallel to each other, have a common central axis, and are separated by a certain distance d; The winding sequence and the number of turns of the first transmitting coil 31 and the second transmitting coil 32 can be the same or different, and can be connected in series or in parallel, as long as it is guaranteed that the coil center can produce a reverse reaction at any time during the power supply period. The receiving coil 4 is located between the double transmitting coils 3, either in the middle position of the double transmitting coils 3 or in a non-middle position, by debugging the receiving coil 4 and the first t...

Embodiment 2

[0054] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the double transmitting coil 3 in this embodiment adopts two first transmitting coils 31 and second transmitting coils 32 with different sizes, for the processing and assembly of the coils Equal geometric accuracy requirements are relaxed and easy to implement.

Embodiment 3

[0056] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 is that in this embodiment, the dual transmitting coil 3 adopts two first transmitting coils 31 and second transmitting coils 32 that do not have a common central axis. For the processing of coils, Geometric accuracy requirements such as assembly are relaxed and easy to implement.

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Abstract

The invention provides a transient electromagnetic detection apparatus and a method of eliminating inductive disturbance. The transient electromagnetic detection apparatus includes a coil device and aframework carrier, wherein the coil device includes dual transmission coils, receiving coils and a coil fixing mount; the dual transmission coils include first and second transmission coils which areparallel to each other, are not in the same plane and can generate counter magnetic fields at the center of the respective coil at any power-on moment; the receiving coils are arranged between the dual transmission coils, and for the distance, the constraint is that earlier signals are not beyond the amplitude; a rotation shaft which is parallel to the dual transmission coils and can drive the coil device to overturn is arranged on the coil fixing mount; and a nonmetal handle is arranged on the rotation shaft. The method of eliminating inductive disturbance measures the signals before and after 180DEG overturning of the coil device at the same position point and performs difference processing, by enabling the transmission coils in the detection apparatus to approach the area to be detected and enabling the normal of the transmission coils to be perpendicular to the area to be detected. The method of eliminating inductive disturbance enables earlier signals not to be beyond amplitude,and can capture whole course secondary field signals by eliminating inductive disturbance and enhance the distinguishing result.

Description

technical field [0001] The invention relates to the technical field of transient electromagnetic exploration, in particular to a transient electromagnetic detection device based on double transmitting coils and an application method for eliminating inductive interference. Background technique [0002] Transient electromagnetic method has developed into a relatively mature geophysical prospecting method, which can be widely used in resource exploration, geological prospecting in mining, water conservancy, transportation and other fields. In recent years, its application in shallow fine prospecting has gradually become a hot spot. In order to improve lateral resolution and construction convenience, multi-turn small loop devices are often used. However, because the coil is a non-pure resistive load, this will lead to: affected by the inductive reactance of the transmitting coil, the excitation current is not an ideal step waveform, and there is a certain off-time. For the conve...

Claims

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Application Information

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IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 倪圣军刘惠洲吴昭戚俊胡雄武张立好胡斌臧伟王奇
Owner ANHUI HUIZHOU GEOLOGY SECURITY INST
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