Development of Interferometer for Acoustic Emission Testing
Publication: Journal of Engineering Mechanics
Volume 119, Issue 11
Abstract
The characterization of the exact response of an acoustic emission sensor is of fundamental importance for the quantitative nondestructive evaluation of engineering components. To effectively determine an acoustic emission source, the influence of the sensor on the measured waveform must be determined. A heterodyne interferometer is developed and tested for the detection of acoustic emission signals. This optical device makes localized absolute measurements of out‐of‐plane surface velocities with very high fidelity. An important feature of this system is that a linear frequency modulation (FM) discriminator is used to demodulate the carrier signal; as a result, the interferometer behaves as a Doppler‐shift detector. A series of experiments was performed to test the response of commercially available, piezoelectric acoustic emission transducers in order to understand their potential influence on a measured acoustic emission waveform.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 119 • Issue 11 • November 1993
Pages: 2303 - 2316
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Nov 2, 1992
Published online: Nov 1, 1993
Published in print: Nov 1993
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