Passive fiber optic sonar system

Optics: measuring and testing – By polarized light examination – With birefringent element

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73655, G01N 2141

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active

043113915

ABSTRACT:
A fiber optic sonar system wherein first and second optical fibers are wound on a common mandrel and provided with a light energy beam. An acoustic signal differentially varies the index of refraction of the optical fibers to result in an interference pattern dependent upon the frequency of the received acoustic signal or signals. The apparatus is operable to form one or more hollow conical receiver beams.

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Becaro et al., "Single Fiber Interferometric Acoustic Sensor", Applied Optics , vol. 17, No. 3, p. 330, 1978.
Cole et al., "Fiber-Optic Detection of Sound", J. Acout. Soc. Am., vol. 62, No. 9, 11/77, p. 1136.
Bacaro et al., "Optical Fiber Acoustic Sensor", Applied Optics, vol. 16, No. 7, p. 1761, Jul. 1977.

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