基于STA/LTA的输油管道泄漏检测方法

研究了将微震检测中的STA/LTA方法与负压波检测法相结合，并应用于输油管道泄漏检测的技术方法.根据管道泄漏时产生的负压波波形与微震信号初至的相似性，可利用STA/LTA方法对该特征波形进行准确的提取和捕捉，并通过对比管道首末站检测到该特征波形的时间差，对泄漏点位置进行定位.研究表明该方法可有效识别突变的负压波信号，并减少传统泄漏检测方法中小波变换等信号处理方法带来的计算复杂性.室内实验结果表明，将STA/LTA应用于输油管道泄漏检测具备可行性且能够有效识别负压波信号. 

A STA/LTA Based Pipeline Leak Detection Method

A method, combing the STA/LTA method in seismic identification with the negative pressure detection, was studied and applied to oil pipeline leak detection. According to the signal similarity of seismic first arrival and negative pressure produced in oil pipeline leak, the STA/LTA method was used to capture and extract the arrival time of negative pressure wave precisely. By obtaining the time delay between the stations on the two sides of the pipe, the position of leak could be calculated. Studied results indicate that, STA/LTA method can not only effectively recognize the leak signal, but also can reduce the computational complexity in the signal processing, such as the wavelet analysis. The experimental results show the superiority of the STA/LTA method, that it can recognize the negative pressure wave effectively.