Leak Detection of Water Pipeline Using Wavelet Transform Method

In order to solve the leak problem from water pipeline, the principle of water pipeline leak detection using acoustic theory is elaborated and the location algorithm is given. A leak detection technique combines wavelet transform and cross-correlation technique is the focus in this paper. The leak location algorithm using wavelet transform for noise reduction before using cross-correlation technique to calculate the time arrival difference between the two vibration sensors. After wavelet transform denoising, by introducing the optimal maximum likelihood based on cross-correlation technique, the time delay estimate between the two sensors is precisely calculated and obtained. Then a compare between this method and basic cross-correlation method is conducted. Simulation results verifies the validity of the new measuring method.