A method for determining the position of zero magnetic flux plane of antennae using the opposing-coils transient electromagnetic method

QI Qing-Xin; XI Zhen-Zhu; XU Yu; MU Ren

doi:10.11720/wtyht.2022.1599

2022 Vol. 46, No. 6

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Article navigation > Geophysical and Geochemical Exploration > 2022 > 46(6): 1540-1544

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QI Qing-Xin, XI Zhen-Zhu, XU Yu, MU Ren. 2022. A method for determining the position of zero magnetic flux plane of antennae using the opposing-coils transient electromagnetic method. Geophysical and Geochemical Exploration, 46(6): 1540-1544. doi: 10.11720/wtyht.2022.1599

Citation:

QI Qing-Xin, XI Zhen-Zhu, XU Yu, MU Ren. 2022. A method for determining the position of zero magnetic flux plane of antennae using the opposing-coils transient electromagnetic method. Geophysical and Geochemical Exploration, 46(6): 1540-1544. doi: 10.11720/wtyht.2022.1599

A method for determining the position of zero magnetic flux plane of antennae using the opposing-coils transient electromagnetic method

1. Hunan Wuwei Geological Technology Co., Ltd.,Changsha 410205,China；
2. School of Geosciences and Info-Physics,Central South University,Changsha 410083,China；
3. Hunan Institute of Metrology and Test,Changsha 410014,China

Received Date: 10 November 2021

Revised Date: 20 December 2022

Publish Date: 03 January 2023

Abstract

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.
- opposing coils /
- TEM /
- zero magnetic flux plane /
- power spectral density

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References

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