Issue |
J. Phys. IV France
Volume 04, Number C5, Mai 1994
3ème Congrés français d'acoustique3rd French conference on acoustics |
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Page(s) | C5-729 - C5-732 | |
DOI | https://doi.org/10.1051/jp4:19945157 |
3ème Congrés français d'acoustique
3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-729-C5-732
DOI: 10.1051/jp4:19945157
1 Institut d'Electronique et de Micro-électronique du Nord, Département Opto-Acousto-Electronique (IEMN-DOAE), UMR 9929 du CNRS, Ecole Centrale de Lille, BP. 48, 59651 Villeneuve d'Ascq cedex, France
2 Laboratoire de Mécanique de Lille, Equipe Mécanique des Fluides, LML, URA 1441 du CNRS, Université des Sciences et Technologies de Lille, Cité Scientifique, Bâtiment M3, 59655 Villeneuve d'Ascq cedex, France
© EDP Sciences 1994
3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-729-C5-732
DOI: 10.1051/jp4:19945157
Etude par visualisations ultra rapides et mesures de pression d'une source impulsionnelle large bande non-directive
Ph. PERNOD1, A. MERLEN2, A. KEMMOU1 and A. AHYI11 Institut d'Electronique et de Micro-électronique du Nord, Département Opto-Acousto-Electronique (IEMN-DOAE), UMR 9929 du CNRS, Ecole Centrale de Lille, BP. 48, 59651 Villeneuve d'Ascq cedex, France
2 Laboratoire de Mécanique de Lille, Equipe Mécanique des Fluides, LML, URA 1441 du CNRS, Université des Sciences et Technologies de Lille, Cité Scientifique, Bâtiment M3, 59655 Villeneuve d'Ascq cedex, France
Abstract
Ponctual sound sources with very short and simple signature (the ideal beeing a diractype) could be very usefull in all the fields of transient acoustics. However, such sources cannot be realised by conventionnal electroacoustic transducers, because these last cannot be considered as point sources and generally have poor transient responses. We present here the solution we have developped, a "mini-sparker" which generates a very brief acoustic impulse. The characterization of the wave emitted is performed both, by ultra-rapid cinematographic ombroscopic visualisations, and broad-banded pressure measurements.
© EDP Sciences 1994