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    MULTIPLE SEGMENT FIBER OPTIC HYDROPHONE
    2.
    发明专利
    MULTIPLE SEGMENT FIBER OPTIC HYDROPHONE 未知

    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

    IPC: G01H9/00 ,  H04B11/00 ,  H04R1/44

    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.

    Fiber optic planar hydrophone
    4.
    发明专利
    Fiber optic planar hydrophone 未知

    公开(公告)号：GB2278439B

    公开(公告)日：1997-07-16

    申请号：GB9410218

    申请日：1994-05-23

    Applicant: LITTON SYSTEMS INC

    Inventor： MEYER A DOUGLAS ,  DANVER BRUCE ,  MOORE EMERY L

    IPC: G01B9/02 ,  G01B11/16 ,  G01D5/353 ,  G01H9/00 ,  G02B6/00 ,  G02B6/02 ,  H04R1/44 ,  H04R23/00

    Abstract: A plurality of air-backed elongate mandrels are arranged in an planar array such that their longitudinal axes are parallel. A length of a first optical fiber is wound around portions of each mandrel in a first group of the mandrels for exposure to the parameter. The first optical fiber is arranged such that exposing it to the parameter to be sensed causes the length of the first optical fiber to increase and decrease in direct proportion as the parameter increases and decreases. A length of the second optical fiber is wound around a second group of the mandrels for exposure to the parameter. The second optical fiber preferably is arranged such that exposing it to the parameter to be sensed causes the length of the second optical fiber to increase and decrease in inverse proportion as the parameter increases and decreases.

    Multiple segment fiber optic hydrophone
    5.
    发明专利
    Multiple segment fiber optic hydrophone 未知

    公开(公告)号：AU670429B2

    公开(公告)日：1996-07-18

    申请号：AU3703493

    申请日：1993-04-19

    Applicant: LITTON SYSTEMS INC

    Inventor： MAAS STEVEN J ,  MEYER A DOUGLAS

    IPC: G01H9/00 ,  H04B11/00 ,  H04R1/44

    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.

    7.
    发明专利
    未知

    公开(公告)号：FR2705782B1

    公开(公告)日：1995-12-15

    申请号：FR9406480

    申请日：1994-05-27

    Applicant: LITTON SYSTEMS INC

    Inventor： MEYER A DOUGLAS ,  DANVER BRUCE ,  MOORE EMERY L

    IPC: G01B9/02 ,  G01B11/16 ,  G01D5/353 ,  G01H9/00 ,  G02B6/00 ,  G02B6/02 ,  G01L23/00 ,  G01L1/24 ,  G01H17/00 ,  G01D5/26

    Abstract: A plurality of air-backed elongate mandrels are arranged in an planar array such that their longitudinal axes are parallel. A length of a first optical fiber is wound around portions of each mandrel in a first group of the mandrels for exposure to the parameter. The first optical fiber is arranged such that exposing it to the parameter to be sensed causes the length of the first optical fiber to increase and decrease in direct proportion as the parameter increases and decreases. A length of the second optical fiber is wound around a second group of the mandrels for exposure to the parameter. The second optical fiber preferably is arranged such that exposing it to the parameter to be sensed causes the length of the second optical fiber to increase and decrease in inverse proportion as the parameter increases and decreases.

    Hydrophones
    8.
    发明专利
    Hydrophones 未知

    公开(公告)号：GB2272345A

    公开(公告)日：1994-05-11

    申请号：GB9308890

    申请日：1993-04-29

    Applicant: LITTON SYSTEMS INC

    Inventor： MAAS STEVEN J ,  MEYER A DOUGLAS

    IPC: G01H9/00 ,  H04B11/00 ,  H04R1/44 ,  H04R23/00

    Abstract: Each hydrophone component is based upon a single-mandrel design in which a cylindrical body is apportioned into sensing and reference sections 38, 40. The sensing section comprises a coaxial arrangement of pliant inner and outer cylinders 50, 48 separated by an annular airspace 52 while the adjacent reference section comprises a solid-walled cylinder 40. Finite separation distances between the hydrophone components result in reduced flow noise occasioned by increased sensing area while detection sensitivity is maintained. The acoustic sensing elements 34, 36 are optical fibres.

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