一种分布式光纤震动传感系统

摘要

A form of fiber⁃optic vibration⁃sensing system based on the dual Mach⁃Zehnder fiber interferometric scheme is designed.The system uses 3×3 demodulation scheme,with the function of obtaining the goal information without distortion and positio⁃ning the outside target signal.Moreover,the experimental system is constructed and the feasibility of the system scheme is verified.%针对当前分布式光纤震动传感系统中存在的震动信号获取问题，采用一种全新的光路形式，设计了一种基于双M⁃Z干涉仪方案的分布式光纤震动传感系统。系统采用3×3解调方案，从采集的传感器输出信号中解调出目标震动信号，且目标震动信号无失真。偏振控制器的引入避免了系统的偏振衰落现象。在此基础上搭建了实验测试系统，对外界目标信号进行了测试，测试结果表明，系统可以无失真探测目标信号，并对目标进行定位，定位误差为20 m，验证了系统的可行性。