便携式等值反磁通瞬变电磁系统及试验应用

doi:10.11720/wtyht.2024.0169

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Abstract

In shallow engineering investigations, the small-loop transient electromagnetic (TEM) system is challenged by limitations such as overweight equipment, significant transmitter-receiver mutual inductance, and high manpower requirements. Hence, this study introduced an improved system. Based on the opposing-coils transient electromagnetic (OCTEM) theory, this study calculated the magnetic field distribution of the generalized opposing-coils antenna device. Furthermore, it designed and developed efficient portable antennas and the supporting system (collectively referred to as the portable OCTEM system). Subsequent field experiments demonstrate that while ensuring exploration accuracy, the portable OCTEM system can enhance the investigation efficiency by effectively mitigating the transmitter-receiver mutual inductance and significantly reducing manpower requirements. This study preliminarily verifies the feasibility of the portable OCTEM system, providing a novel technology route for developing downsized shallow exploration equipment.

Key words： transient electromagnetic (TEM) system opposing-coils transient electromagnetic (OCTEM) device portable antenna

Received: 15 April 2024 Published: 08 January 2025

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	Articles by authors
	Sheng ZHOU
	Xing-Peng CHEN
	Jun WANG
	Qing-Xin QI
	Zhi-Qing ZHANG
	Ji-Min PAN
	Zhen-Zhu XI
	Chun-Hua YANG

Cite this article:

Sheng ZHOU,Xing-Peng CHEN,Jun WANG, et al. Portable opposing-coils transient electromagnetic system and its application tests[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1479-1485.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0169 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1479

Schematic diagram of the opposing-coils transient electromagnetic system

The opposing-coils transient electromagnetic system of HPTEM-18

Generalized opposing-coils transient electromagnetic α device (a) and β device (b)

Coordinate system of the circular current-carrying coil magnetic field calculation column

B_z component of the magnetic field on the axis (a)and magnetic field B_z=0 on the axial plane (b) of the generalized α device

B_z component of the magnetic field on the axis (a)and magnetic field B_z=0 on the axial plane (b) of the generalized β device

Portable transient electromagnetic antenna base on generalized β device

Structure diagram of the portable opposing-coils transient electromagnetic system

Physical diagram of the portable opposing-coils transient electromagnetic system

The application of portable opposing-coils transient electromagnetic system
a—field test application;b—layout of measurement lines and abnormal projection diagram for a certain transmission tower foundation;c—observation data of L0 line 38 m measuring point;d—section diagram of L0;e—section diagram of L6;f—section diagram of L12

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