16 November 2010 Detection of surface breaking on cylinder material using surface acoustic wave generated by scanning laser source
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Abstract
Laser ultrasonics, a nondestructive test method (NDT), is more and more applied in industrial fields such as crack detection in metal and nonmetallic materials, and size measurement and welded joint examination. According to the thermoelastic theory, a finite element model for laser-generated surface waves on the elastic cylinder material is built and an experimental installation using laser interferometer as the ultrasonic wave receiver is set up to verify the numerical results. By changing the relative distance between the laser source and the surface notch in the computation, the scanning procedure is simulated. The corresponding varieties of amplitudes of the surface waves, which propagate circumferentially on the cylinder material, are presented and the physical mechanisms are analyzed. The influence of the depth of the surface notch is also discussed. The results demonstrate the SLS technique can be applied to detect tiny crack whose depth is smaller than the wavelength of the SAW.
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Yifei Shi, Lu Zhang, Liangxu Cai, "Detection of surface breaking on cylinder material using surface acoustic wave generated by scanning laser source", Proc. SPIE 7843, High-Power Lasers and Applications V, 78431B (16 November 2010); doi: 10.1117/12.869382; https://doi.org/10.1117/12.869382
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