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对光纤分布式传感器的三态偏振分集检测方法进行了理论分析,提出将输出信号经过偏振膜产生三态并平方和相加的处理方式,实现了系统抗偏振衰落。进一步分析,在信号处理后续增加自动增益控制设计,得到较为稳定的检测信号幅度。仿真结果验证了理论推导的可行性,并分析了C值波动对系统性能的影响。
The three-state polarization diversity detection method of fiber optic distributed sensor is theoretically analyzed, and the processing method that the output signal is tristated and summed by the sum of squares through the polarizing film is proposed, and the anti-polarization fading of the system is achieved. Further analysis, follow-up in the signal processing to increase the design of automatic gain control, get a more stable detection signal amplitude. The simulation results verify the feasibility of the theoretical derivation, and analyze the impact of C value fluctuations on system performance.