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《Materials Review》 2018-S1
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Study on Detection Principle and Performance of Capacitive Ocean Electric Field Sensor

SHEN Zhen;SONG Yusu;JIANG Runxiang;College of Science,Naval University of Engineering;  
In this paper,the principle of capacitive electrode for detecting oceanic electric field is studied,and the method of reducing the input impedance of the amplifier circuit to stabilize the double layer of carbon fiber is proposed.The oceanic electric field electrode was prepared by poly-acrylonitrile carbon fiber T300.The electrochemical workstation was used to measure the cyclic voltammetry curve of the electrode,and the impedance of the electrodes in the sink was measured using the AC method.The effects of different input impedance(500Ω,1 kΩ,2 kΩ)on the potential stability,noise stability and measurement performance of the carbon fiber electrode under the underwater electric field were studied.The experimental results show that the electrode prepared by carbon fiber T300 exhibits capacitive effect in water.The smaller the input impedance,the faster stabilizations of the electrode potential and the noise stabilization.After the stabilization,the noise from the electrode reached 1 nV/√Hz@1 Hz.In the signal conditioning circuit input impedance of 500Ω,the prepared electrode can achieve the best self-noise performance;the electrode can accurately restore the ocean electric field signal above 0.001 Hz.All in all,the ocean electric field sensor the prepared carbon fiber electrode and a suitable input impedance of the amplification circuit can satisfied the detection of weak ocean electric field and the rapid deployment of the detection equipment.
【Fund】: 国家自然科学基金(41476153)
【CateGory Index】: TP212;U674.70
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