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Proceedings Paper

Characterization of microscopic surface breaking cracks using the near-field intensification of nondestructive laser-generated surface waves
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Paper Abstract

Optical generation and detection of surface acoustic waves provides a non-contact, remote means of characterizing microscopic surface-breaking cracks in aerospace and industrial materials. Surface ultrasonic displacement fields generated by a non-destructive, laser induced thermoelastic mechanism and detected with an interferometric probe allow for an all optical and spatially adjustable (spot-size, beam shape, beam separation) utlrasonic NDE system. Location of surface-breaking cracks is achieved through observation of a near-field intensification of the detected ultrasonic signal in the vicinity of the crack. The near-field intensification was found to be optimized by scanning both the source and detection beams with specific spatial variables. This non-contact, laser beam scanning NDE technique, allows for imaging capabilities to further enhance surface-breaking crack characterization.

Paper Details

Date Published: 21 July 2004
PDF: 10 pages
Proc. SPIE 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II, (21 July 2004); doi: 10.1117/12.541552
Show Author Affiliations
Adam T. Cooney, Univ. of Dayton (United States)
James L. Blackshire, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 5392:
Testing, Reliability, and Application of Micro- and Nano-Material Systems II
Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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