Numéro |
J. Phys. IV France
Volume 04, Numéro C5, Mai 1994
3ème Congrés français d'acoustique3rd French conference on acoustics |
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Page(s) | C5-1213 - C5-1216 | |
DOI | https://doi.org/10.1051/jp4:19945268 |
3ème Congrés français d'acoustique
3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1213-C5-1216
DOI: 10.1051/jp4:19945268
Laboratoire de Microacoustique de Montpellier, Université de Montpellier II, Place Eugène Bataillon, SDI 5978 du CNRS, 34095 Montpellier, France
© EDP Sciences 1994
3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1213-C5-1216
DOI: 10.1051/jp4:19945268
Signature V(z) en microscopie acoustique : influence de la non-uniformité de l'illumination du capteur
G. DESPAUX, C. MAUREL, D. BARJON and J. ATTALLaboratoire de Microacoustique de Montpellier, Université de Montpellier II, Place Eugène Bataillon, SDI 5978 du CNRS, 34095 Montpellier, France
Abstract
This paper deals with the improvement of the surface velocity measurements by removing the central part of the acoustic beam of a lens in defocusing configuration responsible for the V(z) acoustic signature. We investigate the influence of occulting the top of the lens by a circular stop of varying parameters. The V(z) is significantly affected but does not allow a complete decorrelation of the central beam. An alternative solution is proposed with a lens set at the half Fresnel length.
© EDP Sciences 1994