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对应用于安全防范、石油管道监测的双马赫-曾德型光纤安防系统的结构及工作原理进行分析.针对现场测试结果,分析了影响系统精度的误差因素,提出影响系统精度和增加误报率主要是由于偏振态变化不一致导致的两路干涉信号幅值波动以及附加相位噪声引入的距离定位误差.并展开对系统偏振衰落形成机理及其主要影响因素的定量定性分析,同时建立数学模型,进行仿真计算.最后通过对双马赫-曾德型光纤安防系统样机进行实验,验证了分析结果的正确性.
The structure and working principle of dual Mach-Zehnder optical fiber security system used in safety precaution and petroleum pipeline monitoring are analyzed.According to the field test results, the error factors affecting system accuracy are analyzed, and the influence of system accuracy and false alarm rate Mainly due to the amplitude polarization of the two-way interference signals and the distance positioning errors introduced by additional phase noise caused by the inconsistent changes of polarization states.A quantitative and qualitative analysis of the formation mechanism of the system polarization fading and its main influencing factors are also carried out. At the same time, a mathematical model is established Finally, through the experiment of the dual Mach-Zehnder optical fiber defense system prototype, the correctness of the analysis results is verified.