Generation of Dispersive Acoustic Waves by the Phase Velocity Scanning of a Laser Beam
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Laser ultrasonics is expected to provide a nondestructive evaluation (NDE) method of materials in circumstances where liquid or gel coupler can not be used[1-6]. However, the main limitation of this technique is its low sensitivity compared with the standard piezoelectric transducer method. One of this reason is the low amplitude of acoustic waves that can be generated without damage. If one uses high peak power laser to generate strong acoustic waves, ablation damage of the surface is resulted [2] as illustrated in Fig.1 (a). Even in the thermoelastic regime, photodissociation may be introduced in polymers by repeated laser irradiation [3].