| Issue |
J. Phys. IV France
Volume 04, Number C7, Juillet 1994
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique |
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|---|---|---|
| Page(s) | C7-765 - C7-768 | |
| DOI | https://doi.org/10.1051/jp4:19947180 | |
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-765-C7-768
DOI: 10.1051/jp4:19947180
1 Laboratoire d'Electronique, Physique Appliquée et Productique, Ecole Centrale de Paris, Grande Voie des Vignes, 92290 Châtenay-Malabry, France
2 Département de Génie Electrique et Informatique, Ecole Polytechnique de Montréal, Canada
© EDP Sciences 1994
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-765-C7-768
DOI: 10.1051/jp4:19947180
Time-frequency-energy analysis of ultrasound waves generated and detected by laser : application to quality control
H. El Mekki1, J.P. Longuemard1, M. Unal2 and J.L. Houle21 Laboratoire d'Electronique, Physique Appliquée et Productique, Ecole Centrale de Paris, Grande Voie des Vignes, 92290 Châtenay-Malabry, France
2 Département de Génie Electrique et Informatique, Ecole Polytechnique de Montréal, Canada
Abstract
Ultrasounds are generally used in non-destructive testing (NDT) with sensors working with a narrow bandwith. The optical sensors generate and detect acoustical waves without contact and allows measurements in a wide band of frequencies. From this fact, the information contained in the signal captured is complete and give informations (celerity calculated by the time arrival of acoustical waves, attenuation and defect presence). The time-frequency-energy analysis is efficient for the acoustical waves comportment analysis in samples.
© EDP Sciences 1994