Analysis and elimination of bias error in a fiber-optic current sensor

Wang Xiaxiao; Zhao Zijie; Li Chuansheng; Yu Jia; Wang Zhenjie

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Analysis and elimination of bias error in a fiber-optic current sensor

机译：光纤电流传感器中的偏置误差分析和消除

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Bias error, along with scale factor, is a key factor that affects the measurement accuracy of the fiber-optic current sensor. Because of polarization crosstalk, the coherence of parasitic interference signals could be rebuilt and form an output independent of the current to be measured, i.e., the bias error. The bias error is a variable of the birefringence optical path difference. Hence, when the temperature changes, the bias error shows a quasi-periodical tendency whose envelope curve reflects the coherence function of light source. By identifying the key factors of bias error and setting the propagation directions of a super-luminescent diode, polarization-maintaining coupler and polarizer to fast axis, it is possible to eliminate the coherence of parasitic interference signals. Experiments show that the maximum bias error decreases by one order of magnitude at temperatures between -40 degrees C to 60 degrees C. (C) 2017 Optical Society of America

机译：偏置误差以及比例因子是影响光纤电流传感器的测量精度的关键因素。由于偏振串扰，可以重建寄生干扰信号的相干性，并形成独立于要测量的电流的输出，即偏置误差。偏置误差是双折射光路径的变量。因此，当温度变化时，偏置误差显示了拟包络曲线反映光源的相干功能的准周期性趋势。通过识别偏置误差的关键因素并将超发光二极管的传播方向设置为快速轴的偏振耦合器和偏振器，可以消除寄生干扰信号的相干性。实验表明，最大偏差误差在-40摄氏度至60摄氏度之间的温度下在温度下减小一个级。（c）2017年光学学会

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《Applied optics》 |2017年第32期|共9页
作者
Wang Xiaxiao; Zhao Zijie; Li Chuansheng; Yu Jia; Wang Zhenjie;
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Beihang Univ Sch Instrument Sci &

Optoelect Engn Beijing 100091 Peoples R China;

Beihang Univ Sch Instrument Sci &

Optoelect Engn Beijing 100091 Peoples R China;

Natl Inst Metrol Electromagnet Div Beijing 100029 Peoples R China;

Beihang Univ Sch Instrument Sci &

Optoelect Engn Beijing 100091 Peoples R China;

Beihang Univ Sch Instrument Sci &

Optoelect Engn Beijing 100091 Peoples R China;

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正文语种 eng
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Analysis and elimination of bias error in a fiber-optic current sensor

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