分布式光纤振动传感纵向定位技术在电力电缆防外力破坏上的应用

Application of Distributed Optical Fiber Vibration Sensor Longitudinal Positioning Technology in Protection of Power Cable from External Damage

本文研究了一种基于TDOA技术的分布式光纤振动传感系统纵向定位技术,能有效实现对振动源距离光缆的纵向距离做出准确响应。通过将分布式光纤振动传感系统的探测光纤进行离散化,对光缆上离散化后两点接收到振动信号的时间差建立外力破坏的振动纵向定位模型,计算振动距离光缆的纵向距离。该方法能够分辨外力破坏距离光缆的变化情况,有效降低误报率,大大增强光纤振动传感系统在电力电缆防外力破坏方面有效应用的可行性。

A distributed optical fiber vibration sensor system based on TDOA technology is studied, which can effectively respond to the longitudinal distance between the vibration source and the optical cable. The detection fiber of distributed optical fiber vibration sensing system is discretized. The vibration longitudinal location model of external force damage is established by the time difference between two points receiving vibration signal after discretization. The longitudinal distance of vibration from optical cable is calculated. This method can distinguish the change of external force damage distance from optical cable, effectively reduce the false alarm rate and greatly enhance the optical fiber vibration sensing. The feasibility of effective application of the system in the protection of power cable from external damage.