Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1982-09-13
1984-09-11
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
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.
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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.
Bethurum William J.
Hughes Aircraft Company
Karambelas Anthony W.
Miller Russell Ben
Tudor Harold J.
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