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An investigation into the establishment and assessment of a test facility for the calibration of acoustic emission sensors.

Esward, T J; Theobald, P D; Dowson, S P; Preston, R C (2002) An investigation into the establishment and assessment of a test facility for the calibration of acoustic emission sensors. NPL Report. CMAM 82

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Abstract

This report documents the results of a study into the establishment and assessment of a reference test facility for the calibration of acoustic emission sensors. It has been shown that sensor calibration can be achieved in compressional wave mode by through-transmission measurement using a well-characterised glass test block. A new laser interferometer of high sensitivity and excellent noise performance has been acquired and it has been shown that laser interferometry provides an effective method of making non-contact measurements of surface displacement for calibration purposes.
The calibration method chosen for the work relied on the transmission of tone bursts of relatively long duration through a glass test block. However, it has been demonstrated that given the limit size of the block, and the resonant nature of the AE sensors available for calibration, this method can be sensitive to the signal processing method chosen for analysis the calibration data. Calibration of resonant sensors at lower frequencies would require a larger test block, if measurement uncertainties are not to become unacceptably large but calibration of wide bandwidth sensors is likely to prove much less problematic.
The report also reviews existing international standards in the field of acoustic emission and describes calibration methodologies adopted by national measurement institutions and other organisations with an interest in acoustic emission sensor characterisation. In addition, it provides advice and guidance on calibration and testing methodologies for users of acoustic emission sensors.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 82
Keywords: acoustic emission, transducer calibration, interferometer
Subjects: Acoustics
Acoustics > Sound in Air
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2421

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