公开(公告)号：NO20013609D0

公开(公告)日：2001-07-20

申请号：NO20013609

申请日：2001-07-20

Applicant: LITTON SYSTEMS INC

Inventor： GOLDNER ERIC LEE ,  TWEEDY MICHAEL J ,  FERSHT SAMUEL N ,  HALL DAVID B

IPC: G01H20060101 ,  G01H9/00 ,  H04R1/46 ,  G01H

公开(公告)号：DE60111137T2

公开(公告)日：2006-05-04

申请号：DE60111137

申请日：2001-07-19

Applicant: LITTON SYSTEMS INC

Inventor： GOLDNER ERIC LEE ,  TWEEDY MICHAEL J ,  FERSHT SAMUEL N ,  HALL DAVID B

IPC: G01H9/00 ,  A61K31/164 ,  G01P15/093 ,  G01V1/18

Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequency range of the acoustic waves of interest. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural disk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 68) flex in response to acceleration of the support member along its longitudinal axis. The surfaces of the first and second flexural disks (40, 68) preferably include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).

公开(公告)号：CA2353428C

公开(公告)日：2004-10-19

申请号：CA2353428

申请日：2001-07-23

Applicant: LITTON SYSTEMS INC

Inventor： TWEEDY MICHAEL J ,  FERSHT SAMUEL N ,  GOLDNER ERIC LEE ,  HALL DAVID B

IPC: G01H9/00 ,  G01P15/093 ,  G01H1/00 ,  G01J9/02

Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequen cy range of the acoustic waves of interest. Spiral-wound optical fiber coils (5 3, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural di sk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 6 8) flex in response to acceleration of the support member along its longitudina l axis. The surfaces of the first and second flexural disks (40, 68) preferabl y include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).

公开(公告)号：CA2432727A1

公开(公告)日：2002-07-18

申请号：CA2432727

申请日：2001-02-15

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N ,  WU SHEN-HUI L ,  TWEEDY MICHAEL J ,  GOLDNER ERIC LEE

IPC: G01B11/00 ,  G01B9/02 ,  G01B11/16 ,  G01H9/00 ,  G01P15/093

Abstract: A fiber optic displacement sensor (10) includes a flexural disk (16) assembl y affixed to mounting post (20) that extends from a support base (22). The flexural disk (16) assembly is mounted in a housing (101). Spiral wound optical fiber coils (12, 16) are mounted on opposite sides (16A, 16B) of the flexural disk (16) with optical fiber leads (12A, 12B, 14A, 14B) extending from both the inner and outer diameters of the optical fiber coils (12, 14). Optical signals output from the coils (12, 14) are coupled together to form an interferometer (70, 114). An inertia ring (60) connected to the periphery of the flexural disk (16) has a plurality of peripheral slots (68, 92, 38) therein for routing the optical fiber leads (12A, 12B, 14A, 14B) from the first and second optical fiber coils to other components in the housing (101 ). The inertia ring (60) has curved side edges (61, 63) formed such that the optical fiber leads (12A, 12B, 14A, 14B) may be spiral wound thereon between the first and second coils (12, 14) and the peripheral slots (68, 92, 98) to prevent damage to the optical fiber leads (12A, 12B, 14A, 14B) from sharp bends. The slots (68, 92, 98) in the inertia ring (60) are arranged to allow differing lengths of fiber to be wound circumferentially in different depth slots to accommodate mismatches in optical fiber lead lengths (12A, 12B, 14A , 14B), which allows the fiber leads (12A, 12B, 14A, 14B) to ultimately exit t he flexural disk (16) together and take the same path to the coupler (76) to provide improved common mode rejection of extraneous environmentally-induced phase shifts.

公开(公告)号：NO20030425L

公开(公告)日：2003-03-03

申请号：NO20030425

申请日：2003-01-27

Applicant: LITTON SYSTEMS INC

Inventor： TWEEDY MICHAEL J ,  GOLDNER ERIC LEE

IPC: G01H9/00 ,  G01P15/093 ,  G01P15/08

Abstract: A fiber optic sensor comprises a flexural disk having a pair of fiber optic coils mounted on opposite sides thereof and connected together to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. The sidewall is formed to have an inwardly facing groove in which an outer edge portion of the flexural disk is mounted. A support member extends between oppositely facing portions of the first and second end plates and through a central passage in the flexural disk. A damping member is mounted on the central support member and arranged to exert a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural disk and control the sensor output signal amplitude over a selected frequency band in order to maximize dynamic range.

公开(公告)号：NO20030425A

公开(公告)日：2003-03-03

申请号：NO20030425

申请日：2003-01-27

Applicant: LITTON SYSTEMS INC

Inventor： TWEEDY MICHAEL J ,  GOLDNER ERIC LEE

IPC: G01H9/00 ,  G01P15/093 ,  G01P15/08

CPC classification number: G01H9/004 ,  G01P15/093

公开(公告)号：CA2432727C

公开(公告)日：2005-04-26

申请号：CA2432727

申请日：2001-02-15

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N ,  WU SHEN-HUI L ,  GOLDNER ERIC LEE ,  TWEEDY MICHAEL J

IPC: G01B11/00 ,  G01B9/02 ,  G01B11/16 ,  G01H9/00 ,  G01P15/093

Abstract: A fiber optic displacement sensor (10) includes a flexural disk (16) assembl y affixed to mounting post (20) that extends from a support base (22). The flexural disk (16) assembly is mounted in a housing (101). Spiral wound optical fiber coils (12, 16) are mounted on opposite sides (16A, 16B) of the flexural disk (16) with optical fiber leads (12A, 12B, 14A, 14B) extending from both the inner and outer diameters of the optical fiber coils (12, 14). Optical signals output from the coils (12, 14) are coupled together to form an interferometer (70, 114). An inertia ring (60) connected to the periphery of the flexural disk (16) has a plurality of peripheral slots (68, 92, 38) therein for routing the optical fiber leads (12A, 12B, 14A, 14B) from the first and second optical fiber coils to other components in the housing (101 ). The inertia ring (60) has curved side edges (61, 63) formed such that the optical fiber leads (12A, 12B, 14A, 14B) may be spiral wound thereon between the first and second coils (12, 14) and the peripheral slots (68, 92, 98) to prevent damage to the optical fiber leads (12A, 12B, 14A, 14B) from sharp bends. The slots (68, 92, 98) in the inertia ring (60) are arranged to allow differing lengths of fiber to be wound circumferentially in different depth slots to accommodate mismatches in optical fiber lead lengths (12A, 12B, 14A , 14B), which allows the fiber leads (12A, 12B, 14A, 14B) to ultimately exit t he flexural disk (16) together and take the same path to the coupler (76) to provide improved common mode rejection of extraneous environmentally-induced phase shifts.

公开(公告)号：NO20030425D0

公开(公告)日：2003-01-27

申请号：NO20030425

申请日：2003-01-27

Applicant: LITTON SYSTEMS INC

Inventor： TWEEDY MICHAEL J ,  GOLDNER ERIC LEE

IPC: G01H9/00 ,  G01P15/093 ,  G01P15/08

Abstract: A fiber optic sensor comprises a flexural disk having a pair of fiber optic coils mounted on opposite sides thereof and connected together to form an interferometer that produces an output signal in response to acceleration of the flexural disk. The flexural disk is mounted in a housing having first and second end plates with a sidewall extending between them. The sidewall is formed to have an inwardly facing groove in which an outer edge portion of the flexural disk is mounted. A support member extends between oppositely facing portions of the first and second end plates and through a central passage in the flexural disk. A damping member is mounted on the central support member and arranged to exert a radial force on an inner edge of the central passage in flexural disk to dampen vibrations of the flexural disk and control the sensor output signal amplitude over a selected frequency band in order to maximize dynamic range.

公开(公告)号：CA2353428A1

公开(公告)日：2002-01-24

申请号：CA2353428

申请日：2001-07-23

Applicant: LITTON SYSTEMS INC

Inventor： TWEEDY MICHAEL J ,  HALL DAVID B ,  GOLDNER ERIC LEE ,  FERSHT SAMUEL N

IPC: G01H9/00 ,  G01P15/093 ,  G01H1/00 ,  G01J9/02

Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequen cy range of the acoustic waves of interest. Spiral-wound optical fiber coils (5 3, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural di sk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 6 8) flex in response to acceleration of the support member along its longitudina l axis. The surfaces of the first and second flexural disks (40, 68) preferabl y include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).

公开(公告)号：DE60111137D1

公开(公告)日：2005-07-07

申请号：DE60111137

申请日：2001-07-19

Applicant: LITTON SYSTEMS INC

Inventor： GOLDNER ERIC LEE ,  TWEEDY MICHAEL J ,  FERSHT SAMUEL N ,  HALL DAVID B

IPC: G01H9/00 ,  G01P15/093 ,  A61K31/164 ,  G01V1/18

Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequency range of the acoustic waves of interest. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural disk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 68) flex in response to acceleration of the support member along its longitudinal axis. The surfaces of the first and second flexural disks (40, 68) preferably include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).