This article presents a novel technique to acquire and visualize two-dimensional images of dynamic changes of acoustic pressure in the case of a stationary acoustic wave. This method uses optical feedback interferometry sensing with a near-infrared laser diode. The stationary acoustic wave is generated using two piezoelectric transducers of 40 kHz facing each other, dynamic changes in acoustic pressure are measured in a 100 mm x 100 mm acoustic propagation field whose refractive index is variable along the optical path of the laser from the laser diode to a distant mirror and vice-versa. The image system records an image of 100 x 100 pixels of the acoustic pressure variation.
Fernando Urgiles, Julien Perchoux, Francis Jayat, Clement Tronche, and Thierry Bosch, "Optical feedback interferometry applied to visualize an acoustic stationary wave," Proc. SPIE 10679, Optics, Photonics, and Digital Technologies for Imaging Applications V, 1067911 (Presented at SPIE Photonics Europe: April 26, 2018; Published: 24 May 2018); https://doi.org/10.1117/12.2315718.
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