The principle and application of zero phase measurement of resonant frequency of transient electromagnetic induction antenna
XI Zhen-Zhu1(), MU Ren1, XU Yu2(), ZHOU Sheng1,3, CHEN Xing-Peng3
1. School of Geosciences and Info-Physics,Central South University,Changsha 410083,China 2. Hunan Institute of Metrology and Test,Changsha 410014,China 3. Hunan Wuwei Geological Technology Co., Ltd., Changsha 410205,China
When the transient electromagnetic receiving antenna is in a critically damped state, the output signal is the pure target induction signal. This critical damping state is related to electrical parameters such as inductance, distributed capacitance, and resistance of the receiving antenna. The resistance and inductance values can be directly measured by a spectrum analyzer, but the distributed capacitance cannot be directly obtained. In order to develop a high-performance receiving antenna, this paper proposes a method to accurately calculate the distributed capacitance of the receiving antenna. First, the equivalent circuit model of the transient electromagnetic induction receiving antenna is constructed; then, the calculation formula of the zero-phase resonance frequency of the output signal is derived; Finally, by measuring the resonant frequency of the antenna, the distributed capacitance is calculated. For the purpose of verifying the feasibility of this method, the standard capacitance is compared with the calculated capacitance, and different types of transient electromagnetic induction antennas are tested. The test results show that the zero-phase method can be used to calculate the distributed capacitance with high accuracy, convenience and fastness and can be used to design and produce high-performance transient inductive sensors.
席振铢, 木仁, 徐昱, 周胜, 陈兴朋. 瞬变电磁感应式天线分布电容零相位测试方法与应用[J]. 物探与化探, 2021, 45(3): 737-741.
XI Zhen-Zhu, MU Ren, XU Yu, ZHOU Sheng, CHEN Xing-Peng. The principle and application of zero phase measurement of resonant frequency of transient electromagnetic induction antenna. Geophysical and Geochemical Exploration, 2021, 45(3): 737-741.
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