Optical characterization by temporal deconvolution of one-dimensional laser-ultrasonics signals – Part 1 : theory

Abstract : The laser thermoelastic generation of ultrasound is a promising technique with many potential applications, but it is also a complicated process with many physical phenomena involved. Contrary to a conventional piezoelectric transducer generation, which is a surface phenomenon, a laser generation can activate acoustic sources within the material by optical penetration of the excitation wavelength, resulting in asynchronous wave arrivals at a given point. More generally, in the case of a non-dispersive isotropic material, the laser-ultrasonics displacement signals result from temporal convolutions between optical penetration, laser pulse duration and laser spot extension effects. In this paper, a deconvolution technique is presented that extracts the laser pulse duration contribution from the experimental displacement signals. This deconvolution scheme applied to 1D experiments, in which the laser excitation is spread over a sufficiently large area on the front side of the sample, allows the evaluation of both the optical absorption coefficient and the longitudinal acoustic velocity of the material.
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Communication dans un congrès
9th International Conference on Photoacoustic and Photothermal Phenomena, Jun 1996, Nanjing, China
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Dernière modification le : lundi 19 mars 2018 - 22:38:02
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  • HAL Id : hal-01289278, version 1

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Franck Enguehard, Lionel Bertrand. Optical characterization by temporal deconvolution of one-dimensional laser-ultrasonics signals – Part 1 : theory. 9th International Conference on Photoacoustic and Photothermal Phenomena, Jun 1996, Nanjing, China. 〈hal-01289278〉

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