ZHENG CaiJun,
LIU XinZhuo,
LIN PinRong et al
.2019.Design and realization of the distributed electromagnetic instrument system Chinese Journal of Geophysics(in Chinese),62(10): 3772-3784,doi: 10.6038/cjg2019M0432
Design and realization of the distributed electromagnetic instrument system
ZHENG CaiJun1,2, LIU XinZhuo1,2, LIN PinRong1,2, SUN FuWen1,2,3, LI Yong1,2, LI JianHua1,2, Wang JunLu1,2
1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Science, Langfang Hebei 065000, China; 2. Laboratory of Geophysical Electromagnetic Probing Technologies, Ministry of Land and Resources, Langfang Hebei 065000, China; 3. North China Institute of Aerospace Engineering, Langfang Hebei 065000, China
Abstract:This paper presents a distributed multi-function electromagnetic system developed by using the technology of high-power and steady current emission, low noise measurement, broadband reception, and distributed synchronization. The system consists of a high power electromagnetic transmitter, distributed electromagnetic receiver, magnetic field sensor, rectifier source and other equipment. It uses ARM chip and FPGA chip to control the transmitter and signal shaping, and PC104 industrial control computer and FPGA chip to complete the receiver's whole machine control and signal processing. On a artificial field source model, the measurement functions of controllable source audio-frequency magnetotelluric (CSAMT), frequency domain induced polarization (SIP) and time domain induced polarization (TDIP) are realized. On a natural source model, the measurement functions of magnetotelluric (MT) and audio magnetotelluric (AMT) are also realized. The transmitter can run for more than 12 hours in the case of full power transmission. The dynamic range of the receiver is greater than 120dB. The receiver can receive the signals from 0.001 Hz to 32 kHz. Field experiments and application to a typical mining area show that the performance of this system has reached the international advanced level overall.
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