Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-12-28
1994-02-08
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
356345, 25022719, 73655, G01B 902, H04R 2300, H04B 1300
Patent
active
052854248
ABSTRACT:
Optical fiber coils are formed on inner and outer mandrels. The inner mandrel is spaced apart from the outer mandrel to form a cavity between them with the inner fiber coil being inside the cavity. Water-tight seals between the inner and outer mandrels keep the inner coil isolated from underwater acoustic waves that may be incident upon the outer coil. The optical fibers are included in a dual optical path fiber optic interferometer that includes the inner fiber coil in a first optical path and the outer fiber coil in a second optical path. A central wall divides the inner region of the inner mandrel into two cavities. A tie rod has a first end connected to the wall and a second end extending out of the first cavity in the inner mandrel. A backshell is connected to the second end of the tie rod. The backshell includes a hollow portion formed as a housing for protecting fiber optic components of the interferometer.
REFERENCES:
patent: 4525818 (1985-06-01), Cielo et al.
patent: 4570248 (1986-02-01), Assard
patent: 4799752 (1989-01-01), Carome
patent: 4893930 (1990-01-01), Garrett et al.
patent: 4951271 (1990-08-01), Garrett et al.
patent: 5155548 (1992-10-01), Danver et al.
Litton Systems Inc.
Lobo Ian J.
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