The determination of uncertainty in the calibration of acoustic emission sensors
by Jiri Keprt, Petr Benes
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 4, No. 1, 2009

Abstract: The paper reviews the background and methodology of the primary calibration of Acoustic Emission (AE) sensors. Two practically realised basic calibration methods are described and explained. The method of reciprocity calibration is based on the reciprocity theorem. The input current and reception signal voltage for tone bursts of varying frequency are measured for each pair together with known reciprocity parameters. The step function calibration method is based on the generation of well-characterised displacements of capillary brakes on the surface of the block. The response of the sensor under test is then compared to the response of the reference transducer. The comparison of the results of both methods on a steel block is presented. The shapes of measured calibration characteristics are approximately the same, but there is a difference in amplitude between characteristics. The uncertainty of measurement by reciprocity calibration is determined and presented in the paper. The uncertainty in the range from 60 kHz to 285 kHz was ±3 dB and from 285 kHz to 1 MHz, up to ± 8dB.

Online publication date: Thu, 17-Sep-2009

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