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Transient space-time surface waves characterization using Gabor analysis

Laser ultrasonics allow the observation of transient surface waves along their propagation media and their interaction with encountered objects like cracks, holes, borders. In order to characterize and localize these transient aspects in the Space-Time-Wave number-Frequency domains, the 1D, 2D and 3...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-11, Vol.195 (1), p.012009
Main Authors: Martinez, L, Wilkie-Chancellier, N, Glorieux, C, Sarens, B, Caplain, E
Format: Article
Language:English
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Summary:Laser ultrasonics allow the observation of transient surface waves along their propagation media and their interaction with encountered objects like cracks, holes, borders. In order to characterize and localize these transient aspects in the Space-Time-Wave number-Frequency domains, the 1D, 2D and 3D Gabor transforms are presented. The Gabor transform enables the identification of several properties of the local wavefronts such as their shape, wavelength, frequency, attenuation, group velocity and the full conversion sequence along propagation. The ability of local properties identification by Gabor transform is illustrated by two experimental studies: Lamb waves generated by an annular source on a circular quartz and Lamb wave interaction with a fluid droplet. In both cases, results obtained with Gabor transform enable ones to identify the observed local waves.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/195/1/012009