Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-05-17
1994-12-13
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
73655, H04R 2300, G01B 902
Patent
active
053734874
ABSTRACT:
A distributed acoustic sensor utilizing a Fizeau type fiber optic transducer and a distributed acoustic collector to gather and return acoustic disturbances from remote areas in buried, underground, or underwater installations. A light beam from a laser or LED source is transmitted over a fiber to a remote transducer which is coupled to a distributed acoustic collector. The collector may be an extended pipe or tube system filled with an acoustic conducting medium such as air or an appropriate liquid which communicates with the sensing diaphragm in the transducer. An interference beam whose characteristics are a function of the diaphragm motion is created in the transducer and transmitted back over the common single fiber toward the source. An in-line optical coupler/splitter diverts a portion of the returning modulated beam to a photodetector which outputs a proportional electrical signal to an electronic circuit for amplification and analysis.
REFERENCES:
patent: 4310905 (1982-01-01), Palmer
patent: 4446543 (1984-05-01), McLandrich et al.
patent: 4482805 (1984-11-01), Palmer
patent: 5247490 (1993-09-01), Goepel et al.
patent: 5249163 (1993-09-01), Erickson
Burden Judy K.
Crawford Brian B.
Prenovost Robert J.
Robinson Jeff C.
Tanone Aris
Collins Roy P.
Lobo Ian J.
Mason & Hanger National, Inc.
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