Coupled waveguide acousto-optic hydrophone

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type

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73655, 350 9615, H04R 1700, G01N 2904

Patent

active

044714742

ABSTRACT:
Apparatus is provided for detecting the presence of acoustic signals which includes a laser source, and a detector coupled to opposite end of an acousto-optic transducer. The transducer may employ fiber optic waveguides, etched to allow evanescent coupling therebetween, and disposed within a flexible housing. Integrated and planar optic transducers are provided in various forms employing two integrated optic waveguide channels, two planar waveguides, or a planar waveguide and absorber combination. Each configuration is disposed within a flexible housing and the waveguides are separated from each other by a predetermined distance. Any flexing of the housing is transformed into a displacement of the waveguides relative to one another. The coupling between the waveguides is a very sensitive function of distance, and hence detection of variations in the energy coupled by the waveguides provides an indication of the presence of the acoustic signals.

REFERENCES:
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patent: 4035058 (1977-07-01), Papuchon
patent: 4071753 (1978-01-01), Fulenwider et al.
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patent: 4185884 (1980-01-01), McMahon
patent: 4193130 (1980-03-01), Young et al.
patent: 4286468 (1981-09-01), Altman
New Directional Coupler for Integrated Optics, by Awacher et al., Journal of Applied Physics, vol. 45, No. 11, (Nov. 1971), pp. 4997-4999.
Optical Switch and Modulator in Parallel Waveguides, by E. G. Leam, IBM Tech. Disclosure Bulletin, vol. 17, No. 4, Sep. 1974, pp. 1210-1213.

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