High-order Dynamic Model and Simulation of Closed-loop Fiber-optic Current Sensor
LI Qi1,LI Chuan-sheng2,ZHAO Ye-ming3,SHAO Hai-ming2,CAI Jin-hui1
1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. Beijing Information Science and Technology University, Beijing 100085, China
Abstract：In order to study the pulse current measurement capability of the fiber-optic current sensor, a high-order dynamic model of the sensor in the discrete domain was established, and the step response and frequency response characteristics of the sensor were simulated and analyzed based on Simulink. The results show that increasing the forward gain can improve the sensors response speed and the bandwidth, but too large forward gain will cause the system to overshoot the oscillation, the moving average filter will obviously suppress the overshoot oscillation, but it will also reduce the systems response speed and measurement bandwidth. Finally, a frequency response test platform was built, and the frequency response characteristics of the sensor were tested under different forward gains and filter orders, the non-reciprocal step phase difference was introduced based on the phase modulation principle of the sensor, and the equivalent test of the step response was achieved. The test results of frequency response characteristics and step response characteristics are in good agreement with the simulation results, which proves the accuracy of the model.
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2021, Vol. 42 
