固定干扰源存在下的管道泄漏检测和准确定位

为了解决固定位置的声/振动干扰源引起的管道泄漏声检测的虚警或者漏点定位错误问题,利用泄漏信号源和固定干扰源之间的独立性,通过盲卷源分离算法得到泄漏信号在一定代价函数下的最优估计,并将该估计作为输入信号从检测信号中自适应预测得到泄漏信号,这样就可以保留泄漏信号中的时延信息。对实际检测信号的处理表明,应用提出来的方法可以有效的去除检测信号中来自固定干扰源的噪声,同时不损失泄漏信号中的时延信息,可在固定干扰源存在时实现管道泄漏有效检测和准确定位。 

Leak detection and accurate location in the presence of fixed source of interference

An acoustic/vibrational source at a fixed location will produce false alarm in pipeline leak detection and result in location error while there is a true leakage. To solve this problem, a signal processing method is proposed. This method utilizes the statistical independence between the leakage signal source and the fixed source of interference. An optimal estimate of a leakage signal is obtained by using blind source separation scheme under a certain cost function, then this estimate is used as an input signal for adaptive prediction of the leakage signal exclusive of loss of time delay information. The processing results in actual detections show that this method can effectively remove the fixed source signal of interference within the detection signals without losing the delay information of leakage signal. The results indicate that this method is practical to achieve effective leak detection and accurate location in the presence of fixed source of interference.