LOCALIZATION AND MODE DETERMINATION OF FRACTURE EVENTS BY ACOUSTIC EMISSION

The paper deals with modern quantitative or signal-based acoustic emission (AE) techniques. In order to localize AE events accurately one needs an exact onsettime determination method. These are the wavelet transformation for the filtering of signals and the autoregressive AIC picker for the automatic picking instead of the very time consuming picking by hand. Examples of localization results are given. The signal-based AE technique can also be used for the determination of the fracture mode when the moment tensor is being evaluated. An example demonstrates how the method can be used.

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