基于分布式振动传感的智能光纤监测方案设计

Design of Intelligent Optical Fiber Monitoring Scheme Based on Distributed Vibration Sensing

针对目前分布式振动传感器系统存在设计方案复杂、成本较高的缺陷,提出一种基于瑞利散射的DVS评估方案。对电缆光纤应变分布进行理论分析及力学分析。设计用于评估DVS监测电力电缆动态应变和冲击能力的实验装置。实验阶段,以循环荷载和冲击实验对某供电电缆进行分析。循环荷载试验结果表明,传感光纤上单个点的应变频率和相位与液压执行器偏转范围内的频率和相位相匹配;冲击试验表明,初始冲击后,应变振幅呈指数衰减。试验结果符合实际,进一步验证了所提DVS监测电力电缆方案可实现电力应变曲线绘制过程。该方案为电力智能安防与检测提供了重要的数据基础。

A DVS evaluation scheme based on Rayleigh scattering is proposed to solve the problems of complex design and high cost of distributed vibration sensor system.Firstly,the strain distribution of cable fiber is analyzed theoretically and mechanically.Secondly,an experimental device is designed to evaluate the dynamic strain and shock capability of DVS monitoring power cables.In the experimental stage,a power supply cable is analyzed by cyclic load and impact test.The cyclic load test results show that the strain frequency and phase of a single point on the sensing fiber are consistent with those in the deflection range of the hydraulic actuator.The impact test shows that the strain amplitude decreases exponentially after the initial impact.The experimental results are in accord with the practice,which further verifies that the proposed DVS monitoring scheme can realize the power strain curve drawing process.This scheme provides an important data base for power intelligent security and detection.