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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Parameter Analysis
verfasst von : Tomoki Shiotani
Erschienen in: Acoustic Emission Testing
Verlag: Springer Berlin Heidelberg
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Final goal of monitoring AE phenomena is to provide beneficial information to prevent fatal fracture, by correlating detected AE signals with growing fracture process or deterioration. AE activity is observed transiently or unexpectedly, and the signals generally contain higher frequency components over the audible range as well as a variety of durations. A signal triggering is conventionally made by setting threshold. In the case of trigger-monitoring, only the signals, of which amplitudes exceed the threshold levels, are recognized as AE signals. In the early age of AE measurement, the performance of transient waveform-recorders was so poor in the early age of AE monitoring as that parametric features of the waveforms were normally employed for evaluating AE characteristics. These are hit, amplitude, counts, duration and so forth.