分布式光纤震动传感系统的多点定位问题研究

Study on multiple-point localization problem of distributed fiber-optic vibration-sensing systems

针对3种分布式震动传感系统的多点定位问题进行了研究。论述了Sagnac干涉仪系统不易实现多点定位的原因;分析了双路MZ干涉仪系统的多点定位原理和局限性,并通过仿真验证了两点同时扰动定位失效的情况;最后说明了Φ-OTDR系统实现多点定位的原理和可行性,指出该系统最有可能从根本上解决多点定位问题;同时讨论了后2种系统多点定位的空间分辨率和定位精度。

The multiple-point localization problem of three kinds of distributed vibration sensing systems is studied. The reason why it is not easy for Sagnac interferometer to realize multiple-point localization is explained. The principle and limitation of multiple-point localization for dual path Mach-Zehnder interferometer system are analyzed,and the failure of two-point localization is testified by simulation. The principle and feasibility of multiple-point localization realized by Ф-OTDR system were described. Moreover, spatial resolution and localization precision of the last two systems are discussed.