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针对干涉型光纤传感器中存在的偏振诱导信号衰落现象,对偏振分集器(PDR)抗衰落原理进行了理论推导与软件仿真。设计并搭建了基于相位产生载波(PGC)调制解调、全光纤偏振分集器接收的光纤迈克耳孙型干涉传感实验系统,系统得出的信号与压电陶瓷光纤相位调制器产生的模拟信号基本相符。通过静态扭动干涉臂光纤改变干涉仪偏振状态,测量了PDR三通道可视度,得出信号稳定性、系统本底噪声与可视度的关系。结果表明,选择可视度大于0.5的偏振分集器通道输出可抑制信号衰落并实现信号稳定输出。
Aiming at the phenomenon of polarization-induced signal fading existing in an interference optical fiber sensor, theoretical deduction and software simulation of the anti-fading principle of a polarization splitter (PDR) are carried out. A fiber-optic Michelson-type interferometric sensing system based on phase-modulated carrier (PGC) modulation and demodulation and all-fiber polarization splitter receiver is designed and built. The signal obtained by the system and the analog signal generated by the piezoelectric ceramic fiber phase modulator Basic match. By statically twisting the interferometer arm to change the polarization state of the interferometer, the three-channel PDR visibility was measured, and the relationship between signal stability, system noise floor and visibility was obtained. The results show that choosing polarization channel output with visibility above 0.5 can suppress signal fading and achieve stable signal output.