Finite Element Analysis of the Scanning Laser Line Source Technique
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A scanning laser line source (SLLS) technique is simulated numerically using a finite element method in this study, and changes in amplitude and frequency content have been observed for ultrasound signals generated by laser scanning over a large aluminum block containing a small surface notch. The laser generation of surface acoustic waves with the frequency range from 4 to 15 MHz in an elastic material is modeled using a thermoelastic model for finite element analysis, where a transient heat source is employed to represent a pulsed laser source. The experimentally observed SLLS amplitude and spectral signatures are shown to be captured very well by this model. In addition, the possibility of utilizing the SLLS technique to size surface notches that are sub-wavelength in depth is explored.
- Jpn J Appl Phys
Jpn J Appl Phys 45(6A), 5046-5050, 2006-06-15
INSTITUTE OF PURE AND APPLIED PHYSICS