基于相位光时域反射的光纤分布式声波传感研究

Optical distributed acoustic sensing based on the phase optical time-domain reflectometry

摘要: 文中提出了一种光纤分布式声波传感方案。作用在传感光纤上的声波信号导致后向瑞利散射光的相位变化，将含有声波信息的后向瑞利散射信号注入到迈克尔逊干涉仪，并采用相位载波解调算法解调出相位信息。实验中采用压电拉伸器模拟声波振动，分布式声波传感系统实现了10 m的空间分辨率以及平坦的频响。

Abstract: A distributed acoustic sensing (DAS) scheme was presented. Rayleigh backscattered light which contained acoustic signal induced phase changes along the sensing fiber was fed into a Michelson interferometer, the phase changes were demodulated by the Phase Generated Carrier technology. A piezoelectric simulation experiment of acoustic vibration was designed. The DAS system realized 10 m location resolution of the acoustic source, and the flat frequency response through the experiment.