Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1981-01-16
1983-03-01
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367178, 73655, 455605, 455612, G02B 511, G01V 100, H04B 900
Patent
active
043756808
ABSTRACT:
A light source is operated near its threshhold and its output is split and sent in opposite direction about a fiber optic coil which is exposed to acoustic energy. The recombined light out of the coil is modulated at acoustic frequency. The modulated light can be fed back to the light source which responds to the modulation with large amplitude variations which are sent to a detector for conversion into an electrical signal representative of the acoustic energy. Alternatively, the light beam may be directed from the fiber coil to the detector directly. The sensors can include components for rejecting noise at frequencies not of interest and a plurality of similar sensors can be formed in an array to obtain directional information or increased sensitivity.
REFERENCES:
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Poppo et al., "Vibration Induced Polarization . . . ", 1/79, pp. 1-3.
Shajenko et al., "Signal . . . Light Source", 6/15/80, pp. 1895-1897, Applied Optics, vol. 19, #12.
Bucaro et al., "Acousto-Optic Sensor Development", 10/11/79, pp. 572-580, EASCON, 1979, IEEE E & A Syst.
Bucaro et al., "Single Fiber Interferomatic Acoustic Sensor", 2/1/78, pp. 330-331, Applied Optics, vol. 17, #3.
Cahill Richard F.
Udd Eric
Finch George W.
McDonnell Douglas Corporation
Moskowitz Nelson
Royer Donald L.
Scholl John P.
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