中国激光, 2015, 42 (1): 0105004, 网络出版: 2014-12-11
全光纤电流互感器的新型调制解调方案研究
A Novel Method on Modulation and Demodulation of All Fiber Optical Current Transformer
光纤光学 全光纤电流互感器 归零方波 模拟相干解调 闭环检测 fiber optics all fiber optical current transformer return-to-zero square wave analog coherent demodulation closed loop measurement
摘要
介绍了一种采用新型调制解调方案的全光纤电流互感器。该方案采用归零方波调制相位调制器，以正弦波信号作为本振信号实现模拟相干解调，对采样信号做数字信号处理(有限脉冲响应滤波、滑动平均滤波)完成阶梯波反馈补偿并实现电流闭环检测。对实验结果的分析表明，该方案能实现大电流闭环检测，在室温条件下、额定电流1000 A 时达到IEC 60044-8:2002标准0.2级，具有实际应用价值。
Abstract
A kind of fiber optical current transformer which employs a novel method on modulation and demodulation is proposed. The system controls the phase modulator with a return- to-zero square wave, and implements the analog coherent demodulation with a sine wave which acts as the local oscillator signal, and fulfills the current closed loop measurement by digital signal processing (finite impulse response filter, moving average filter) of acquired data to generate step wave. The result of the experiment suggests that the method can realize the closed loop measurement of large current, meet 0.2 level of IEC 60044-8:2002 standard when rated current is 1000 A at room temperature, and has the practical application value.
欧阳康, 洪小斌, 伍剑, 林金桐. 全光纤电流互感器的新型调制解调方案研究[J]. 中国激光, 2015, 42(1): 0105004. Ouyang Kang, Hong Xiaobin, Wu Jian, Lin Jintong. A Novel Method on Modulation and Demodulation of All Fiber Optical Current Transformer[J]. Chinese Journal of Lasers, 2015, 42(1): 0105004.
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