基于光纤微弯的分布式光纤应力传感器

Study on Distributed Fiber Optic Strain Sensor Based on Fiber Microbend

研究了光纤的微弯损耗机理,在此基础上开发了一种用光时域反射仪(OTDR)进行探测的分布式光纤应力传感器。对光纤微弯调制机构和传感器系统进行了设计与实验,分析了系统的灵敏度和空间分辨率的影响因素,实现了空间分辨率为3m,测量范围为1km的测量精度。现场实验表明,采用该传感器能对山体滑坡等事故的发生实现及时准确的灾害预报。

In this paper, microbend losses of optic fiber is investigated, based on which a distributed fiber optic stress sensor detected by optical time domain reflectometry(OTDR) was designed. The structure of microbended fiber modulation and the system of sensor are designed and tested. Factors influencing system's sensitivity and spatial resolution are analyzed. Spatial resolution of 3 m and stress measuring range of 1 km are obtained. The experiment shows that acurate forecast of disasters such as landslides ...