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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摘要

针对浅层或矿井瞬变电磁法探测中发射系统电源电压有限使发射磁矩受限,而发射回线的寄生电感导致电流关断时间过长的问题,设计了瞬变电磁法超小线圈并联式发射回线,通过线圈的并联来增大发射磁矩,再通过外加电阻等方式减小关断时间。从理论上对常规发射线圈与并联式发射线圈建立了等效电路模型进行分析,并对并联式发射线圈与常规发射线圈进行了实验对比测试。结果表明:并联式发射线圈能有效增大发射磁矩,进而减小关断时间。本设计对减少浅层或矿井瞬变电磁法勘探盲区、加大勘探深度具有指导意义。

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	吴北辰
	潘洋润奕
	程久龙
	王辉
	姚娣
	庞肖颖

关键词 ：瞬变电磁法, 并联式发射回线, 关断时间, 发射磁矩, 超小线圈

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

收稿日期: 2021-08-05 修回日期: 2022-02-26 出版日期: 2022-08-20

ZTFLH:

P631

基金资助:国家自然科学基金项目(41974088);中国矿业大学(北京)大学生创新训练项目(C202002180)

通讯作者: 程久龙

作者简介: 吴北辰(2000-),男,研究方向为瞬变电磁法。Email: bei_chen_wu@163.com

引用本文:

吴北辰, 潘洋润奕, 程久龙, 王辉, 姚娣, 庞肖颖. 瞬变电磁法超小线圈并联式发射回线设计实验[J]. 物探与化探, 2022, 46(4): 934-939.
WU Bei-Chen, PAN Yang-Run-Yi, CHENG Jiu-Long, WANG Hui, YAO Di, PANG Xiao-Yin. Design and test of the parallel ultra-small transmitter loop used in the transient electromagnetic method. Geophysical and Geochemical Exploration, 2022, 46(4): 934-939.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1424 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I4/934

Fig.1 多匝线圈的基本等效电路

Fig.2 常规发射线圈等效电路

Fig.3 并联式发射线圈示意

Fig.4 并联式发射线圈等效电路

Fig.5 加入电阻后的并联式发射线圈等效电路

Fig.6 实验工作场景

Fig.7 关断电流波形及对比

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%

Table 1 不同发射线圈的初始发射电流值对比

Fig.8 关断电流波形及对比

Table 2 不同发射线圈的关断时间对比

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