Study of the parameters of acoustic emission transducers taking into account the influence of the acoustic-electronic channel and calibration conditions

Abstract

Acoustic emission transducers (AET) with piezoelectric cells converting acoustic signals into electric ones, are the most important components of the channel for transmitting information about the parameters of acoustic emission (AE) sources. The main AET parameters are determined by different calibration techniques, but the shape of amplitude-frequency characteristics (AFC) largely depends on the calibration method which significantly complicate the choice of AET for control. We present the results of studying the AET parameters taking into account the role of the acoustic-electronic channel and calibration conditions. It is shown that the most complete data on the AET properties are contained in the impulse response, which should be used to measure the AET parameters. In this case, the AFC is of secondary importance. It is preferable to calibrate the AET using longitudinal waves at normal incidence of the wave on the AET (basic scheme). The results obtained can be used when selecting methods of calibration of working transducers used for diagnostics of industrial objects.