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

Detector for an optical-fiber acoustic sensor using dynamic holographic interferometry

T. J. Hall, M. A. Fiddy, and M. S. Ner
Opt. Lett. 5(11) 485-487 (1980)

Acoustic sensing with a single coiled monomode fiber

S. C. Rashleigh
Opt. Lett. 5(9) 392-394 (1980)

Frustrated-total-internal-reflection multimode fiber-optic hydrophone

W. B. Spillman and D. H. McMahon
Appl. Opt. 19(1) 113-117 (1980)

Passive multiplexing system for fiber-optic sensors

A. R. Nelson, D. H. McMahon, and R. L. Gravel
Appl. Opt. 19(17) 2917-2920 (1980)

Fiber microbend acoustic sensor

J. N. Fields and J. H. Cole
Appl. Opt. 19(19) 3265_1-3267 (1980)