Journal
ULTRASONICS
Volume 42, Issue 1-9, Pages 9-16Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2004.01.101
Keywords
non-contact; acoustic emission; interferometers; holography; EMATs; lasers air(gas)coupling
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Non-contact generation and detection of acoustic and ultrasound waveforms is of practical importance, since it permits making acoustic and ultrasonic measurements at elevated temperatures, in corrosive and other hostile environments, in geometrically difficult to reach locations, in outer space and doing this at relatively large distances from the test structure. Non-contact acoustical and ultrasonic techniques currently available are laser generation, optical interferometric detection, electromagnetic acoustic transducers (EMATs), air(gas)-coupled systems and hybrid combinations of the above. The present paper will describe how several such systems have been used in unique materials characterization applications. (C) 2004 Elsevier B.V. All rights reserved.
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