等值反磁通瞬变电磁法天线零磁通面位置的确定方法

doi:10.11720/wtyht.2022.1599

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摘要

确定零磁通面几何位置是等值反磁通瞬变电磁法探测系统的关键。为此,提出了一种调零方法:用等值反磁通瞬变电磁仪连续发送固定频率的双极性方波,接收机实时采集接收天线的时间域信号,并使用离散傅里叶变换分别计算出粗调、细调和微调接收天线位置的最小功率谱密度(A1、A2、A3),当A1>A2>A3时,接收天线处于零磁通面。发送20 kHz双极性方波试验的结果表明,当A1>A2>A3时,二次场衰减信号过渡过程得到明显改善。该方法可为高性能等值反磁通瞬变电磁仪器的设计和制造提供参考。

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	亓庆新
	席振铢
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	木仁

关键词 ：等值反磁通, 瞬变电磁, 零磁通面, 功率谱密度

Abstract：

Determining the geometric position of the zero magnetic flux plane is the key to the detection system of the opposing-coils transient electromagnetic method (opposing-coils TEM). Given this, a zeroing method was proposed in this study. First, an opposing-coils transient electromagnetometer was used to continuously send the bipolar square wave of fixed frequency. Then, the receiver collected the time domain signals of the receiving antenna in real time, and the discrete Fourier transform was used to calculate the minimum power spectral density (A1, A2 and A3) at the roughly-, finely-, and micro-tuned receiving antenna positions. When A1>A2>A3, the receiving antenna was in the zero magnetic flux plane. Finally, the test results of transmitting 20 kHz bipolar square wave showed that the transition process of the attenuation signals of the secondary field can be significantly improved under the condition of A1>A2>A3.

Key words： opposing coils TEM zero magnetic flux plane power spectral density

收稿日期: 2021-11-10 修回日期: 2022-03-27 出版日期: 2022-12-20

ZTFLH:

P631

基金资助:湖南省标准化专项“等值反磁通瞬变电磁法通用技术标准”(2011709)

通讯作者: 徐昱

作者简介: 亓庆新(1986-),男,硕士,工程师,主要从事工程地球物理勘探仪器研发工作。Email:249310111@qq.com

引用本文:

亓庆新, 席振铢, 徐昱, 木仁. 等值反磁通瞬变电磁法天线零磁通面位置的确定方法[J]. 物探与化探, 2022, 46(6): 1540-1544.
QI Qing-Xin, XI Zhen-Zhu, XU Yu, MU Ren. A method for determining the position of zero magnetic flux plane of antennae using the opposing-coils transient electromagnetic method. Geophysical and Geochemical Exploration, 2022, 46(6): 1540-1544.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1599 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I6/1540

Fig.1 发射电流波形

Fig.2 功率谱曲线

Fig.3 衰减信号数据曲线对比

Fig.4 调零前后数值差异

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