Double-coil coupled multi-wave survey system

A coupled, double-coil technology, applied in the field of transient electromagnetic detection, can solve the problems of not being able to take into account both the shallow detection information and the deep detection information, the power reduction of the power supply system, the loss of the shallow detection information, etc., to improve the shallow detection information. Detection effect, reducing interference, eliminating the effect of multiple magnetic field aliasing

Active Publication Date: 2019-09-06
CHONGQING CUILU DETECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems existing in domestic transient electromagnetic transmitters are: first, the delay of the magnetic field shutdown is too long, and the shallow detection information is seriously lost; second, the emission magnetic field is unstable, and the power supply system The power will drop, resulting in changes in the transmission waveform, poor quality of the received signal, and large detection errors; third, the detection depth is single, and it is impossible to take into account both shallow detection information and deep detection information

Method used

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  • Double-coil coupled multi-wave survey system
  • Double-coil coupled multi-wave survey system
  • Double-coil coupled multi-wave survey system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Parameter settings of the main transmitter coil and the slave transmitter coil:

[0084] Both the main transmitting coil and the secondary transmitting coil adopt single-turn cross-linked polyethylene copper core power cables.

[0085] The main transmitting coil has 4 turns, and the cross-sectional area of ​​the copper core power cable is 80mm 2 , coil radius 17.5m, inductance 3mH, resistance 0.125Ω.

[0086] 1 turn from the transmitting coil, the cross-sectional area of ​​the copper core power cable is 20mm 2 , coil radius 17.5m, inductance 0.26mH, resistance 0.185Ω.

[0087] When emitting a large magnetic moment:

[0088] The transmission is jointly synthesized by the main transmitting coil and the secondary transmitting coil, and the pulse waveform received by the main transmitting coil and the secondary transmitting coil is a bipolar trapezoidal pulse, which rises linearly and falls linearly.

[0089] From image 3 It can be seen that the specific parameters ar...

Embodiment 2

[0107] The parameter settings of the main transmitting coil and the secondary transmitting coil are the same as those in Embodiment 1.

[0108] When emitting a large magnetic moment:

[0109]The emission is jointly synthesized by the main transmitting coil and the secondary transmitting coil, the main transmitting coil passes a bipolar trapezoidal pulse current, and the secondary transmitting coil passes a bipolar triangular wave current. Control the current from the transmitting coil to realize the constant power of the first excitation field, the compensation effect diagram is shown in Figure 5 shown.

[0110] From Figure 4 It can be seen that the specific parameters are:

[0111] Peak magnetic moment: 1300,000Am2, equivalent to 4 turns 330A.

[0112] Flat Top Ripple: 1%.

[0113] Rise time: 1ms.

[0114] Fall time: 1ms.

[0115] Flat top width: 5ms.

[0116] Large magnetic moment half wave: 17ms.

[0117] When emitting a small magnetic moment:

[0118] It is tra...

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Abstract

A dual-coil coupled multi-wave exploration system, comprising a transmission control system. A first set of pulse signal output ends of the transmission control system is connected with a master transmitting coil, and a second set of pulse signal output ends of the transmission control system is connected with a slave transmitting coil. The master transmitting coil and the slave transmitting coil are coupled coils and are overlapped in position. A receiving coil module is provided at the edge of the master transmitting coil, and is partially intersected with the master transmitting coil; and the partial orthographic projection of the master transmitting coil is coincide with the partial orthographic projection of the receiving coil module. The dual-coil coupled multi-wave exploration system can realize alternate detection of the deep part and the shallow part, is short in the current turn-off time for the shallow detection, low in loss, high in detection precision and work efficiency, simple in structure and high in mobility; the master transmitting coil and the receiving coil module are intersected partially and thus the mutual inductance influences between the master transmitting coil and the receiving coil are cancelled, so that the exploration precision is improved.

Description

technical field [0001] The invention relates to the technical field of transient electromagnetic detection, in particular to a double-coil coupled multi-wave survey system. Background technique [0002] Transient electromagnetic method is also called time domain electromagnetic method (TEM), which uses ungrounded return line or grounding line source to transmit a pulsed magnetic field to the ground. The method of observing the secondary eddy current field. Simply put, the basic principle of the transient electromagnetic method is the law of electromagnetic induction. The decay process is generally divided into early, middle and late stages. The early electromagnetic field is equivalent to the high-frequency component in the frequency domain, with fast attenuation and small skin depth; while the late component is equivalent to the low-frequency component in the frequency domain, with slow attenuation and large skin depth. The geoelectric characteristics at different depths...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
Inventor 付志红姜升王耀朱学贵王唯邱婧竹魏秋生李军强
Owner CHONGQING CUILU DETECTION TECH CO LTD
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