瞬变电磁法超小线圈并联式发射回线设计实验

doi:10.11720/wtyht.2022.1424

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Abstract

In the shallow or mine prospecting using the transient electromagnetic method (TEM), the transmitting magnetic moment is limited by the limited supply voltage of the transmitting system, and the stray inductance of the transmitter loop causes a long turn-off time. To solve these problems, this study designed a parallel transmitter loop of ultra-small coils used in TEM. Using these coils, the transmitting magnetic moment can be increased by the parallel connection of the coils, and the turn-off time can be reduced by additional resistance. The equivalent circuit models of the conventional transmitter coils and the parallel transmitter coils were established and analyzed theoretically. Moreover, the comparative test between the parallel transmitter coils and the conventional transmitter coils were carried out. The results show that the parallel transmitter coils can effectively increase the magnetic moment and reduce the turn-off time. Therefore, this design is greatly significant for reducing the blind area and increasing the prospecting depth in shallow or mine prospecting using TEM.

Key words： TEM parallel transmitter loop turn-off time transmitting magnetic moment ultra-small coil

Received: 05 August 2021 Published: 17 August 2022

ZTFLH:

P631

Corresponding Authors: CHENG Jiu-Long E-mail: bei_chen_wu@163.com;JLCheng@126.com

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	Articles by authors
	Bei-Chen WU
	Yang-Run-Yi PAN
	Jiu-Long CHENG
	Hui WANG
	Di YAO
	Xiao-Yin PANG

Cite this article:

Bei-Chen WU,Yang-Run-Yi PAN,Jiu-Long CHENG, et al. Design and test of the parallel ultra-small transmitter loop used in the transient electromagnetic method[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 934-939.

URL:

https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1424 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/934

Equivalent circuit of the multi-turn loop

Equivalent circuit of the common transmitter loop

Schematic diagram of parallel transmission loop

Equivalent circuit of the parallel transmitter loop

Equivalent circuit of the parallel transmitter loop with added resistance

Test scenario

Turn-off current waveform and comparison

子回线参数		一般发射回线发射电流值I₀/A	并联式发射回线发射电流值 $I 0'$ /A	I₀/ $I 0'$
L/mH	R/Ω	一般发射回线发射电流值I₀/A	并联式发射回线发射电流值 $I 0'$ /A	I₀/ $I 0'$
1.58	10.34	1.043	1.910	55%
7.98	6.30	1.776	3.065	58%
7.98	5.30	2.064	3.601	57%
1.58	11.52	0.953	1.782	53%

Comparison of initial current of different transmitting loops

Turn-off current waveform and comparison

Comparison of turn-off time of different transmitting loops

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