Abstract

An experimental study has been made of an optical-waveguide coupler-type acoustic sensor employing multimode fibers. With LED sources the sensor behaves as an optical-intensity-modulation sensor with sensitivities in the 70–80-dB range re 1 μPa. Higher sensitivities are obtained by using He–Ne laser sources, but this appears to be due to phase- rather than intensity-modulation processes.

© 1980 Optical Society of America

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