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Communication Dans Un Congrès Année : 2012

Scanned laser beam generation of Lamb waves for surface defect detection

Steve Dixon
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Susan Burrows
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B. Dutton
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Y. Fan
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Résumé

Previous workers have shown how pulsed laser beams generating Rayleigh waves can be used to detect surface defects, resulting in some interesting changes in the detected signal including a strong enhancement in the generation of higher frequency components. In this paper, a pulsed Nd:YAG laser with an approximately Gaussian beam shape is directed onto the surface of a metal sheet in the thermoelastic regime, generating Lamb waves in the sheet. The laser beam is raster scanned across the surface of the sample and travels omni-directionally outwards from the generation point. In this case, the Lamb waves are detected some distance away by an electromagnetic acoustic transducer, but can and have also been detected by interferometric means. The presence of a crack-like defect on the sheet is detected by either a sudden change in the ultrasonic waveform or by an enhancement in the frequency content of the waveform when the laser beam illuminates directly onto the crack.
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hal-00811395 , version 1 (23-04-2012)

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  • HAL Id : hal-00811395 , version 1

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Steve Dixon, Susan Burrows, B. Dutton, Y. Fan. Scanned laser beam generation of Lamb waves for surface defect detection. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811395⟩

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