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

Adam T. Cooney; James L. Blackshire

doi:10.1117/12.541552

21 July 2004 Characterization of microscopic surface breaking cracks using the near-field intensification of nondestructive laser-generated surface waves

Adam T. Cooney, James L. Blackshire

Author Affiliations +

Proceedings Volume 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II; (2004) https://doi.org/10.1117/12.541552
Event: NDE for Health Monitoring and Diagnostics, 2004, San Diego, CA, United States

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.

Citation Download Citation

Adam T. Cooney and James L. Blackshire "Characterization of microscopic surface breaking cracks using the near-field intensification of nondestructive laser-generated surface waves", Proc. SPIE 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II, (21 July 2004); https://doi.org/10.1117/12.541552

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