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Experimental and theoretical waveforms of Rayleigh waves generated by a thermoelastic laser line source
1Laboratoire Ondes et Acoustique, ESPCI-Université Paris 7-CNRS UMR 7587, Paris, France. daniel.royer@espci.fr
Ultrasonics
|September 30, 2000
Summary
A new model predicts surface acoustic waves generated by lasers in solids. Experiments confirm the model
Area of Science:
- Solid mechanics
- Acoustics
- Laser-ultrasonics
Background:
- Laser-material interactions can generate acoustic waves.
- Understanding these waves is crucial for non-destructive testing.
Purpose of the Study:
- To develop an analytical model for Rayleigh wave generation by a thermoelastic laser line source.
- To provide a closed-form expression for surface displacement.
Main Methods:
- Developed an analytical model for thermoelastic generation of surface acoustic waves.
- Utilized a Gaussian light intensity profile.
- Derived a closed-form expression for normal surface displacement.
Main Results:
- The model accurately predicts Rayleigh wave generation.
- Closed-form expressions were obtained for near and far-field displacements.
- Experimental validation was performed on a duraluminum plate using interferometry.
Conclusions:
- The analytical model provides a reliable method for analyzing laser-generated Rayleigh waves.
- The findings are applicable to material characterization and defect detection.