Thin filament interferometric microphone
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A thin filament which follows the motion of a gas is used to measure small pressure fluctuations for photoacoustic spectroscopy. Optical heterodyne detection of laser radiation scattered from the filament provides a sensitive measurement of its displacement. This device may be particularly useful for low-pressure spectroscopy or under experimental conditions where the use of a standard microphone is inconvenient.
author list (cited authors)
Miles, R. B., Gelfand, J., & Wilczek, E.