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Laser ultrasonic study of Lamb waves: determination of the thickness and velocities of a thin plate |
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| Authors: | Weimin Gao Christ Glorieux Jan Thoen |
| Affiliation: | a Departement Natuurkunde, Laboratorium voor Akoestiek en Thermische Fysica, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium b Department of Lithography, Silicon Process Technology Division, Imec, Kapeldreef 75, B3001 Leuven, Belgium c Postdoctoral researcher for Fonds voor Wetenschappelijk, Onderzoek-Vlaanderen, Belgium |
| Abstract: | Transient Lamb waves in a thin copper plate were generated and measured using a laser ultrasonic setup. A two-dimensional Fourier transform method has been employed to analyse the dispersion curves. This allowed a clear identification of multi-mode Lamb waves. Fitting of the dispersion curve allowed a direct determination of the thickness and bulk velocities, as well as the elastic constants. The obtained experimental results of Lamb waves on a copper plate show excellent agreement with the theoretical model. |
| Keywords: | Laser ultrasonics Lamb waves Wave dispersion Elastic property |
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