基于Φ-OTDR的铁轨异物入侵监测方法

A Method to Monitor Railway Tracks' Foreign Body Invasion Based on Φ-OTDR

提出一种基于相位敏感光纤传感技术(Φ-OTDR)的铁轨异物入侵监测方法,采用Φ-OTDR首先采集一段时间内铁轨振动的原始信号,并对原始信号进行滤波、短时傅里叶变换和自回归模型谱估计处理;然后通过提取和分析信号的频率特征,来判定监测铁轨路段上任意位置点是否有事件发生;最后通过对该位置点前后位置点是否有事件的判断来区分正常列车行驶和异物入侵事件。该方法仅使用现有轨旁光缆,无需额外施工,可实现大范围分布式检测,对于铁路系统安全运行和防灾安全监测具有重要的潜在应用价值。

A new method based on phase sensitive optical fiber sensing technology（Φ-OTDR） is presented in this paper.The method first uses Φ-OTDR to acquire the original signal of railway tracks’ vibration for a while,then conducts filtering,short-time Fourier transform and auto regressive model spectrum estimation of the original signal.After analyzing the frequency signal feature,can determine whether any events have happened on the track.Finally,invasion events can be distinguished by comparing the signals between the position and the adjacent ones.