3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-1217-C5-1220
Visualisation des champs ultrasonores par interférométrie hétérodyneO. CASULA and D. ROYER
Laboratoire Ondes et Acoustique de l'Université Paris 7, URA 1503 du CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris cedex 05, France
A high resolution optical system has been designed and developed for imaging pulsed ultrasonic fields transmitted in water by piezoelectric transducers. The particle displacement was measured by a compact heterodyne interferometer whose probe beam is reflected by a thin membrane immersed in front of the transducer. Experiments carried out on focused or planar transducers demonstrate the capability of the system to map acoustic fields both in time and spatial domains. The spatial resolution and the dynamic range reached 20 µm and 45 dB and the bandwidth can be enlarged up to 40 MHz. Results are presented in various cross sectional views (B-scans, C-scans and 3D profiles).
© EDP Sciences 1994