DETECTION OF THE PRESENCE OF WATER PIPE DEFORMATION USING TIME-REVERSAL WAVE BY A PAIR OF OMNI-DIRECTIONAL TRANSDUCERS

Abstract

 The maintenance of aging water infrastructure facilities is highly important, thus a simple inspection method is desired. This paper proposes a quick and simple inspection method utilizing time-reversal waves along with a pair of omni-directional transmitter/receiver devices. This method is to evaluate the maximum amplitude of the converged time-reversed pulses in an attempt to determine the presence or absence of deformation of pipes. When the difference in amplitude between the two is small and difficult to identify, the spectrogram of the received waveform and convolutional neural network (CNN) have been successfully employed to improve the accuracy.