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.

© 2019 Optical Society of America

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