Research on ultra-fast turn-off methods and techniques for TEM

GuoHong FU, ZhanYing WANG, Hui CHENG, SongYuan FU, JiaXing YU, ChuKang YONG

Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 758-764.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 758-764. DOI: 10.6038/pg2025II0071

Research on ultra-fast turn-off methods and techniques for TEM

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Abstract

To address the issue of large observation blind zones in Transient Electromagnetic (TEM) surveys, caused by excessive transmitter coil inductance and suboptimal emission current waveform, this study proposes a rapid shutdown TEM method, which minimizes coil inductance and enables rapid primary-field shutdown. An experimental prototype was designed and tested, demonstrating that the proposed method significantly reduces the turn-off time and the coil inductance, while improving emission current waveform fidelity. These enhancements effectively minimize blind zones, indicating strong potential for practical applications.

Key words

Transient Electromagnetic Method (TEM) / Transmitter coil / Rapid shutdown / Turn-off time

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GuoHong FU , ZhanYing WANG , Hui CHENG , et al . Research on ultra-fast turn-off methods and techniques for TEM[J]. Progress in Geophysics. 2025, 40(2): 758-764 https://doi.org/10.6038/pg2025II0071

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