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公开(公告)号：JPH1082692A
公开(公告)日：1998-03-31
申请号：JP15338697
申请日：1997-06-11
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , GOLDMAN ROBERT P , MAAS STEVEN J , MANSELL JOHN E
IPC: G01H9/00
Abstract: PROBLEM TO BE SOLVED: To provide an optical fiber hydrophone capable of averaging effects of a local noise source in a wide region and of being deployed in a portion around a sharp bend section. SOLUTION: An optical hydrophone 30 is constituted as a single interferometer 60 having a plurality of interferometer regions formed of a pair of optical fibers. Inner and outer coils each constituted of the pair of optical fibers are preferably provided as a coaxial pair and form a plurality of sensor regions. A spacer is constituted so as to guide the inner and outer optical fibers between the continuous sensor regions. The change of a physical parameter between sensor regions does not make a phase difference between optical signals guided by both of the fibers. The inner and outer optical coils are preferably exposed to the parameter so that the change of the parameter in each of sensor regions make change of the inverted phase to take place between optical signals in the outer coil and corresponding inner coil.
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公开(公告)号：CA1315864C
公开(公告)日：1993-04-06
申请号：CA602892
申请日：1989-06-15
Applicant: LITTON SYSTEMS INC
Inventor： GOLDMAN ROBERT P , LARSON JOHN G
IPC: G01C19/66
Abstract: FARADAY ROTATOR ASSEMBLY Disclosed herein is a side mounted aperture and a Faraday rotator assembly useful in conjunction with an out-of-plane multi-oscillator ring laser gyroscope. The aperture and Faraday rotator assemblies contain components which are optically contacted to one another as well as the ring laser gyroscope frame. The assemblies disclosed herein provide a simplified construction designed to fixture the Faraday rotator element in order to minimize handling and facilitate alignment to the ring laser gyroscope cavity, free from contamination and in proper alignment for optimum use of the Faraday rotator component and aperture needed for proper operation of an out-of-plane multioscillator ring laser gyroscope.
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公开(公告)号：AU693402B2
公开(公告)日：1998-06-25
申请号：AU2487797
申请日：1997-06-13
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , GOLDMAN ROBERT P , MAAS STEVEN J , MANSELL JOHN E
Abstract: A fiber optic hydrophone (30) is formed as a single interferometer having widely separated interferometer segments (32-35) formed in each of a pair of optical fibers (56-70). The interferometer segments (32-35) are designed to allow averaging of the effects of local noise sources over a broad area in order to increase the acoustic signal-to-noise ratio. The interferometer segments (32-35) also allow deployment of the hydrophone around sharp bends. A first optical fiber (56) is formed into a plurality of spatially separated outer coils (58,90,94). A second optical fiber (70) is formed into a plurality of inner coils (72,92,96) corresponding to the outer coils. The inner (50) and outer coils (72) are preferably arranged in concentric pairs to form a plurality of sensor segments (32-35). A plurality of spacers (40-42) is arranged such that a spacer is between successive sensor segments. The spacers (40-42) are formed to guide the outer (56) and inner (70) optical fibers between successive sensor segments (32-35) such that changes in the physical parameter between the sensor segments (32-35) produce no phase difference between optical signals guided by the outer (56) and inner (70) fibers. The outer (58) and inner coils (70) are preferably arranged for exposure to the parameter such that changes in the parameter at each sensor segment produce opposite phase changes between the optical signals in the outer coils and the corresponding outer coil.
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公开(公告)号：NO955191L
公开(公告)日：1995-12-20
申请号：NO955191
申请日：1995-12-20
Applicant: LITTON SYSTEMS INC
Inventor： GOLDMAN ROBERT P , ARAB-SADEGHABADI AKBAR , VARNI ANSELM F
Abstract: A connector for making and securing low loss optical contact between a first plurality of optical fibers, each including a ferrule-encapsulated terminal end, and a second plurality of optical fibers, each also including a ferrule-encapsulated terminal end. Each of the ferrules is individually fixed to a cap that includes an asymmetrical keying member. Male and female connector members include internal channels for accepting ferrule-fixed cups with predetermined angular orientations. Springs are axially aligned within the channels for independently urging each cup-fixed ferrule into optical contact with a mating ferrule. In this way, multiple rotational and axial alignments are simultaneously and independently achieved and maintained between mated pairs of optical fibers.
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公开(公告)号：NO972783L
公开(公告)日：1997-12-18
申请号：NO972783
申请日：1997-06-16
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , GOLDMAN ROBERT P , MAAS STEVEN J , MANSELL JOHN E
Abstract: A fiber optic hydrophone (30) is formed as a single interferometer having widely separated interferometer segments (32-35) formed in each of a pair of optical fibers (56-70). The interferometer segments (32-35) are designed to allow averaging of the effects of local noise sources over a broad area in order to increase the acoustic signal-to-noise ratio. The interferometer segments (32-35) also allow deployment of the hydrophone around sharp bends. A first optical fiber (56) is formed into a plurality of spatially separated outer coils (58,90,94). A second optical fiber (70) is formed into a plurality of inner coils (72,92,96) corresponding to the outer coils. The inner (50) and outer coils (72) are preferably arranged in concentric pairs to form a plurality of sensor segments (32-35). A plurality of spacers (40-42) is arranged such that a spacer is between successive sensor segments. The spacers (40-42) are formed to guide the outer (56) and inner (70) optical fibers between successive sensor segments (32-35) such that changes in the physical parameter between the sensor segments (32-35) produce no phase difference between optical signals guided by the outer (56) and inner (70) fibers. The outer (58) and inner coils (70) are preferably arranged for exposure to the parameter such that changes in the parameter at each sensor segment produce opposite phase changes between the optical signals in the outer coils and the corresponding outer coil.
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Patent Agency Ranking
公开(公告)号：NO972783A
公开(公告)日：1997-12-18
申请号：NO972783
申请日：1997-06-16
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , GOLDMAN ROBERT P , MAAS STEVEN J , MANSELL JOHN E
CPC classification number: G01H9/004
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公开(公告)号：CA2204720A1
公开(公告)日：1997-12-17
申请号：CA2204720
申请日：1997-05-07
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , MANSELL JOHN E , MAAS STEVEN J , GOLDMAN ROBERT P
Abstract: A fiber optic hydrophone (30) is formed as a single interferometer having widely separated interferometer segments (32-35) formed in each of a pair of optical fibers (56-70). The interferometer segments (32-35) are designed to allow averaging of the effects of local noise sources over a broad area in order to increase the acoustic signal-to-noise ratio. The interferometer segments (32-35) also allow deployment of the hydrophone around sharp bends. A first optical fiber (56) is formed into a plurality of spatially separated outer coils (58,90,94). A second optical fiber (70) is formed into a plurality of inner coils (72,92,96) corresponding to the outer coils. The inner (50) and outer coils (72) are preferably arranged in concentric pairs to form a plurality of sensor segments (32-35). A plurality of spacers (40-42) is arranged such that a spacer is between successive sensor segments. The spacers (40-42) are formed to guide the outer (56) and inner (70) optical fibers between successive sensor segments (32-35) such that changes in the physical parameter between the sensor segments (32-35) produce no phase difference between optical signals guided by the outer (56) and inner (70) fibers. The outer (58) and inner coils (70) are preferably arranged for exposure to the parameter such that changes in the parameter at each sensor segment produce opposite phase changes between the optical signals in the outer coils and the corresponding outer coil.
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公开(公告)号：AU684139B2
公开(公告)日：1997-12-04
申请号：AU2425295
申请日：1995-04-21
Applicant: LITTON SYSTEMS INC
Inventor： GOLDMAN ROBERT P , ARAB-SADEGHABADI AKBAR , VARNI ANSELM F
Abstract: A connector for making and securing low loss optical contact between a first plurality of optical fibers, each including a ferrule-encapsulated terminal end, and a second plurality of optical fibers, each also including a ferrule-encapsulated terminal end. Each of the ferrules is individually fixed to a cap that includes an asymmetrical keying member. Male and female connector members include internal channels for accepting ferrule-fixed cups with predetermined angular orientations. Springs are axially aligned within the channels for independently urging each cup-fixed ferrule into optical contact with a mating ferrule. In this way, multiple rotational and axial alignments are simultaneously and independently achieved and maintained between mated pairs of optical fibers.
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公开(公告)号：NO955191A
公开(公告)日：1995-12-20
申请号：NO955191
申请日：1995-12-20
Applicant: LITTON SYSTEMS INC
Inventor： GOLDMAN ROBERT P , ARAB-SADEGHABADI AKBAR , VARNI ANSELM F
CPC classification number: G02B6/3869 , G02B6/3822 , G02B6/3875 , G02B6/3878 , G02B6/3894
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公开(公告)号：CA2204720C
公开(公告)日：1999-10-26
申请号：CA2204720
申请日：1997-05-07
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , MANSELL JOHN E , GOLDMAN ROBERT P , MAAS STEVEN J
Abstract: A fiber optic hydrophone is formed as a single interferometer having widely separated interferometer segments formed in each of a pair of optical fibers. The interferometer segments are designed to allow averaging of the effects of local noise sources over a broad area in order to increase the acoustic signal-to-noise ratio. The interferometer segments also allow deployment of the hydrophone around sharp bends. A first optical fiber is formed into a plurality of spatially separated outer coils. A second optical fiber is formed into a plurality of inner coils corresponding to the outer coils. The inner and outer coils are preferably arranged in concentric pairs to form a plurality of sensor segments. A plurality of spacers is arranged such that a spacer is between successive sensor segments. The spacers are formed to guide the outer and inner optical fibers between successive sensor segments such that changes in the physical parameter between the sensor segments produce no phase difference between optical signals guided by the outer and inner fibers. The outer and inner coils are preferably arranged for exposure to the parameter such that changes in the parameter at each sensor segment produce opposite phase changes between the optical signals in the outer coils and the corresponding outer coil.
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