时间域航空电磁系统探测深度研究

doi:10.13278/j.cnki.jjuese.20180224

Abstract

Abstract: The exploration depth of a time-domain airborne electromagnetic (EM) system is closely related to many factors such as sampling time, transmitting dipole moment, earth conductivity, instrument background noise,and sensitivity. This study is about the exploration depth of time-domain airborne EM systems based on time-domain one-dimensional forward modeling. The forward algorithm starts from the Maxwell equation and combines the quasi-static approximation conditions to obtain the vertical component of the EM field response in the frequency domain of the central loop over a one-dimensional layered medium. Hankel integral is used to calculate the EM responses in frequency-domain and then obtain the time-domain responses via time-frequency transform. We set the minimum identifiable signal threshold to be three times of the system background noise level to obtain the maximum detectable departure time, from which we obtained the maximum depth of exploration with the average conductivity. Finally, taking the VTEM system as an example, we analyzed and discussed the maximum exploration depth of airborne EM system in the time domain under different layered media models and different transmission magnetic moments, background noise, transmission pulse width and flight altitude.

Key words: time-domain, airborne EM, exploration depth, noise level

CLC Number:

P613.3

Han Xue, Yin Changchun, Ren Xiuyan, Liu Yunhe, Zhang Bo, Cai Jing. Research on Exploration Depth of Time-Domain Airborne EM System[J].Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1448-1456.

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