公开(公告)号：FR2697964A1

公开(公告)日：1994-05-13

申请号：FR9308407

申请日：1993-07-08

Applicant: LITTON SYSTEMS INC

Inventor： MAAS STEVEN J ,  DOUGLAS MEYER A

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.

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

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.

公开(公告)号：FR2705782A1

公开(公告)日：1994-12-02

申请号：FR9406480

申请日：1994-05-27

Applicant: LITTON SYSTEMS INC

Inventor： DOUGLAS MEYER A ,  BRUCE DANVER ,  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.