Combined preprocessing methods for leak locating systems [articol]

Abstract

Real leak signals, acquired in industrial pipeline systems may manifest two typical non stationary signatures: abrupt amplitude random changes on one side and a time varying mean on the other side. This paper proposes a pre-processing algorithm for extracting stationary information from the received signals, in order to improve the leak location on the pipe. This method combines the wavelet de-noising technique with a segmentation algorithm. Comparative results show that, in addition, by using a pre-whitening filter and closing the pipeline’s end, improved estimates can be obtained.