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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：EP0814326A2
公开(公告)日：1997-12-29
申请号：EP97303752
申请日：1997-06-03
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , GOLDMAN ROBERT P , MAAS STEVEN J , MANSELL JOHN E
IPC: G01H9/00
CPC classification number: G01H9/004
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.
Abstract translation: 光纤水听器（30）形成为具有在一对光纤（56-70）中的每一个中形成的具有广泛分离的干涉仪段（32-35）的单个干涉仪。 干涉仪段（32-35）被设计成允许对广泛区域的局部噪声源的影响进行平均，以增加声信噪比。 干涉仪段（32-35）还允许在锋利的弯曲处部署水听器。 第一光纤（56）形成为多个空间分离的外部线圈（58,90,94）。 第二光纤（70）形成为对应于外部线圈的多个内部线圈（72,92,96）。 内部（50）和外部线圈（72）优选地以同心对布置以形成多个传感器段（32-35）。 多个间隔件（40-42）被布置成使得间隔件在连续的传感器段之间。 间隔件（40-42）形成为在连续传感器段（32-35）之间引导外（56）和内（70）光纤，使得传感器段（32-35）之间的物理参数的变化不产生 由外（56）和内（70）纤维引导的光信号之间的相位差。 外部（58）和内部线圈（70）优选地布置成暴露于参数，使得每个传感器段处的参数的变化在外部线圈和对应的外部线圈中的光学信号之间产生相反的相位变化。
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公开(公告)号：CA2097048C
公开(公告)日：2001-09-11
申请号：CA2097048
申请日：1993-05-26
Applicant: LITTON SYSTEMS INC
Inventor： MAAS STEVEN J , MEYER A DOUGLAS
Abstract: A hydrophone includes a plurality of hydrophone components separated by finite spacings and interconnected to provide a single output signal. Each hydrophone component is based upon a single-mandrel design in which a cylindrical body is apportioned into sensing and reference sections. The sensing sections comprise coaxial arrangements of pliant inner and outer cylinders separated by an annular airspace while the adjacent reference sections comprise solid-walled cylinders. Finite separation distances between the hydrophone components result in reduced flow noise occasioned by increased sensing area while detection sensitivity is maintained.
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公开(公告)号：GB2272345B
公开(公告)日：1996-07-24
申请号：GB9308890
申请日：1993-04-29
Applicant: LITTON SYSTEMS INC
Inventor： MAAS STEVEN J , MEYER A DOUGLAS
Abstract: A hydrophone includes a plurality of hydrophone components separated by finite spacings and interconnected to provide a single output signal. Each hydrophone component is based upon a single-mandrel design in which a cylindrical body is apportioned into sensing and reference sections. The sensing sections comprise coaxial arrangements of pliant inner and outer cylinders separated by an annular airspace while the adjacent reference sections comprise solid-walled cylinders. Finite separation distances between the hydrophone components result in reduced flow noise occasioned by increased sensing area while detection sensitivity is maintained.
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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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Patent Agency Ranking
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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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：FR2697964B1
公开(公告)日：1995-10-06
申请号：FR9308407
申请日：1993-07-08
Applicant: LITTON SYSTEMS INC
Inventor： MAAS STEVEN J , DOUGLAS MEYER A
Abstract: A hydrophone includes a plurality of hydrophone components separated by finite spacings and interconnected to provide a single output signal. Each hydrophone component is based upon a single-mandrel design in which a cylindrical body is apportioned into sensing and reference sections. The sensing sections comprise coaxial arrangements of pliant inner and outer cylinders separated by an annular airspace while the adjacent reference sections comprise solid-walled cylinders. Finite separation distances between the hydrophone components result in reduced flow noise occasioned by increased sensing area while detection sensitivity is maintained.
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公开(公告)号：CA2097048A1
公开(公告)日：1994-05-10
申请号：CA2097048
申请日：1993-05-26
Applicant: LITTON SYSTEMS INC
Inventor： MAAS STEVEN J , MEYER A DOUGLAS
Abstract: A hydrophone includes a plurality of hydrophone components separated by finite spacings and interconnected to provide a single output signal. Each hydrophone component is based upon a single-mandrel design in which a cylindrical body is apportioned into sensing and reference sections. The sensing sections comprise coaxial arrangements of pliant inner and outer cylinders separated by an annular airspace while the adjacent reference sections comprise solid-walled cylinders. Finite separation distances between the hydrophone components result in reduced flow noise occasioned by increased sensing area while detection sensitivity is maintained.
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