基于最优吸收回路大功率时间域激电发射机研制

doi:10.11720/wtyht.2025.1216

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Abstract

Large-depth induced polarization sounding requires power supply with long wires and high current. This results in the oscillation of the turn-off waveforms, which greatly affect the accuracy of induced polarization (IP) measurement. To address this issue, this study first constructed a simulation model for electromagnetic induction caused by the long wires for high-power IP transmitters and proposed a method to eliminate IP electromagnetic coupling using an RCD absorption circuit. Then, using the optimal absorption circuit algorithm, the parameters of the optimal absorption circuit were calculated. Afterward, the optimal absorption circuit of the high-power 30 kW IP transmitter was designed, and the simulation results indicate that the optimal absorption circuit effectively mitigated the oscillation of turn-off waveforms. Finally, based on the optimal absorption circuit, a high-power IP transmitter prototype was developed. An AB/2 configuration with a large electrode spacing of 1 500 m was deployed in an area of Shanxi Province. The full turn-off waveforms at four measurement points were repeatedly observed under an emission current of 10 A. With a maximum standard deviation of polarizability estimated at 0.02, the accuracy of the transmitter met the requirements of relevant specifications.

Key words： optimal absorption circuit long conductor and high current high-power IP transmitter RCD absorption circuit

Received: 17 May 2024 Published: 07 August 2025

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	Articles by authors
	Wen-Sheng QIAN
	Zhen-Zhu XI
	Sheng ZHOU
	Qing-Xin QI
	Chang-An XIAO
	Jun WANG
	Wen-Tao XUE

Cite this article:

Wen-Sheng QIAN,Zhen-Zhu XI,Sheng ZHOU, et al. Development of a high-power time-domain induced polarization transmitter based on optimal absorption circuit[J]. Geophysical and Geochemical Exploration, 2025, 49(4): 912-918.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1216 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I4/912

Simulation circuit of induced polarization emission based on RCD absorption circuit

Comparison of received waveforms in simulation circuits before and after introducing RCD absorption circuits

Mathematical model of induced polarization transmitter based on RCD absorption loop

Schematic diagram of circuit current at time t₀

Schematic diagram of circuit current after time t₁

Schematic diagram of circuit current after time t₂

Schematic of circuit current after time t₃

Comparison of shutdown waveforms under different transmission conditions

Optimization shutdown time curve based on RCD absorption circuit

Transmitter system structure

Interruption waveform of induced polarization emission mechanism based on optimal absorption circuit

Comparison of two acquisition results at four test points

Comparison of polarizability between two measurements at the measurement point

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