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Noncontact acousto-ultrasonics using laser generation and laser interferometric detectionA compact, portable fiber-optic heterodyne interferometer designed to detect out-of-plane motion on surfaces is described. The interferometer provides a linear output for displacements over a broad frequency range and can be used for ultrasonic, acoustic emission, and acousto-ultrasonic (AU) testing. The interferometer in conjunction with a compact pulsed Nd:YAG laser represents a noncontact testing system. This system was tested to determine its usefulness for the AU technique. The results obtained show that replacement of conventional piezoelectric transducers (PZT) with a laser generation/detection system make it possible to carry out noncontact AU measurements. The waveforms recorded were 5 MHZ PZT-generated ultrasound propagating through an aluminum block, detection of the acoustic emission event, and laser AU waveforms from graphite-epoxy laminates and a filament-wound composite.
Document ID
19910052392
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Green, Robert E., Jr.
(Johns Hopkins University Baltimore, MD, United States)
Huber, Robert D.
(Johns Hopkins Univ. Baltimore, MD, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Materials Evaluation
Volume: 49
ISSN: 0025-5327
Subject Category
Quality Assurance And Reliability
Accession Number
91A37015
Funding Number(s)
CONTRACT_GRANT: NAG3-728
Distribution Limits
Public
Copyright
Other

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