Source location in thin plates using crosscorrelation.
Ziola, Steven Michael
Gorman, Michael R.
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Alternative methods to first threshold crossing techniques for acoustic emission (AE) source location in dispersive media are presented. The accuracy of source location in dispersive media can be improved by locating frequency components in the transducer outputs to determine the difference in arrival times. Two methods were developed in this study for the arrival time determination. The first involved crosscorrelating the transducer outputs with a cosine wave modulated by a Gaussian pulse to locate a single frequency in the outputs. The second method narrowband filtered the transducer outputs and then crosscorrelated the filtered signals to determine the difference in arrival times. The techniques were experimentally verified by performing lead breaks on the surface of aluminum and graphite/epoxy plates. The results indicate that accurate source location can be attained in dispersive media by taking the wave propagation into account.
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