分布式光纤多参数融合传感系统研究

Research on distributed fiber optic multi-parameter fusion sensing system

摘要:

本文展示了一种融合布里渊光时域反射仪（BOTDR）和相敏光时域反射仪（φ-OTDR）的集成多参数传感系统，可同时测量传感光纤的温度、应变以及振动信息。设置双外差探测结构对信号进行多路复用，并且优化了散射光分光比。在传感距离8.6km并且空间分辨率为3m时，该系统温度和应变的测量精度分别为0.48℃和18.15με，振动测量结果表明其具有5kHz的最大频率响应和100Hz下8.48nε/√Hz的动态应变分辨率。

Abstract:

This paper presents an integrated multi-parameter sensing system that combines Brillouin optical time domain reflectometer (BOTDR) and phase sensitive optical time domain reflectometer (φ-OTDR) to simultaneously measure temperature, strain, and vibration information of the sensing fiber. A double heterodyne detection structure is set up to multiplexed the signal, and the scattered light splitting ratio is optimized. When the sensing distance is 8.6km and the spatial resolution is 3m, the temperature and strain measurement accuracy of the system are 0.48℃ and 18.15με, respectively. The vibration measurement results show that the system has a maximum frequency response of 5kHz and a dynamic strain resolution of 8.48nε/√Hz at 100Hz.