Abstract
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 with 1 to 20 MHz, 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 50 μ;m and 45 dB and the bandwidth can be enlarged up to 30 MHz. Results are presented in various cross sectional views (B-scans, C-scans and 3D profiles).
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