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Abstract Since acoustic emission(AE) source location is based on the time delays of AE signals received at each sensor，the accuracy of AE source location is directly affected by the time-delay estimation of AE signals. First，based on the recognition of the waveform and frequency of AE signals using wavelet transform；the waveforms with a single(or very narrow band) frequency，which are related to AE wave with different damages，are extracted and used to estimate the time delays of the AE signals among sensors；thus a more scientific method for AE source location based on wavelet transform is established. Then，the AE signals during the failure process of rock specimen under uniaxial compression are monitored by using Hyperion AE system，and the AE sources are located by using the common arithmetic provided by this AE system. Finally，the wavelet transform-based method is employed to locate the AE source based on the time delays of AE signals estimated according to the time-frequency energy analyses of AE signals. Comparisons between this new AE source location results with those obtained from Hyperion AE system indicate that the errors of AE source location can be effectively diminished；thus it can enhance the precision for damage detection in rocks.
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Received: 16 December 2009
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