Numéro
J. Phys. IV France
Volume 04, Numéro C5, Mai 1994
3ème Congrés français d'acoustique
3rd French conference on acoustics
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

Signature V(z) en microscopie acoustique : influence de la non-uniformité de l'illumination du capteur

G. DESPAUX, C. MAUREL, D. BARJON and J. ATTAL

Laboratoire 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