A Fabry–Perot interferometer constructed with a pellicle beam splitter can be used as a sensitive microphone. Pressure disturbances inside the interferometer cavity alter the mirror separation, thereby changing the optical interference pattern. The optoacoustic effect can be detected in a cell attached to the Fabry–Perot interferometer by monitoring the change in intensity of the central interference fringe.
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Park et al. (1987) studied this question.
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