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Authors: Bianchi, Silvio* 
Giacomozzi, Emanuele* 
Title: Long-range detection of acoustic vibrations by speckle tracking
Journal: Applied Optics 
Series/Report no.: /58 (2019)
Issue Date: 1-Oct-2019
DOI: 10.1364/AO.58.007805
Abstract: When a rough surface is illuminated by a laser beam, it scatters the light, producing a random interference pattern also known as speckle pattern. By imaging the speckle pattern with a line-scan CCD, we are able to measure the acoustic vibrations of a scattering surface, which can be up to 300 m distant. We also show that our instrument can be used as a laser microphone capable of detecting ambient sound such as a human voice.
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