Abstract
A semi-theoretical model of an acoustic emission ( AE) signal is used to predict the effects of changes of amplification and threshold level in the recording device. Predictions are confirmed by experiments on simulated AE signals. The progress of real AE tests on cracks in welds is analysed statistically to predict the effect of the same variations in the sensitivity of the recording device. Once again the predictions are confirmed by experiment and it is shown how to convert an AE/time curve from one set of recording conditions to another. It is concluded that compensation for distortion of AE signals by changes of sensitivity of the recording device presents no great difficulty.
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