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    BROADBAND FIBER OPTIC ACOUSTIC SENSOR
    31.
    发明专利
    BROADBAND FIBER OPTIC ACOUSTIC SENSOR 未知

    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).

    32.
    发明专利
    未知

    公开(公告)号：DE69723409D1

    公开(公告)日：2003-08-14

    申请号：DE69723409

    申请日：1997-10-02

    Applicant: LITTON SYSTEMS INC

    Inventor： CORDOVA AMADO ,  FERSHT SAMUEL N

    IPC: G01C19/72 ,  G02B6/44

    Abstract: A fibre optic gyroscope has a sensor coil (18). At least one dummy layer (24) forms an integral structure with, and shares the thermal expansion characteristics of, a potted coil (18) comprising a plurality of layers of windings of a first optical fibre. In the gyroscope, the potted coil (18) is arranged to receive the output of a source of optical energy (10) as a pair of beams that counter-propagate therein and to provide the resultant interference pattern, as gyro output, to a detector (16). The dummy layer (24) displaces layers or windings of the potted coil from regions likely to contribute to Shupe bias effects.

    BI-STABLE MICRO-ACTUATOR AND OPTICAL SWITCH
    34.
    发明专利
    BI-STABLE MICRO-ACTUATOR AND OPTICAL SWITCH 未知

    公开(公告)号：CA2438727A1

    公开(公告)日：2002-09-06

    申请号：CA2438727

    申请日：2001-10-11

    Applicant: LITTON SYSTEMS INC

    Inventor： HALL DAVID B ,  CHERBETTCHIAN AGOP H ,  FERSHT SAMUEL N ,  STEWART ROBERT E

    IPC: B81B3/00 ,  B81C1/00 ,  G02B6/35 ,  G02B26/08 ,  B81B7/00 ,  B81B7/02 ,  G02B26/02

    Abstract: A bi-stable micro-actuator is formed from a first and a second silicon-on- insulator wafer fused together at an electrical contact layer. A cover has a V- groove that defines an optical axis. A collimated optical signal source in t he V-groove couples an optical signal to an optical port in the V-groove. A mirror surface on the transfer member blocks or reflects the optical signal. The transfer member has a point of support at the first and second end. The central portion of the transfer member carrying a mirror is displaced from t he compressive axis with transfer member in a bowed first or second state. The mirror blocks or reflects the optical axis. An expandable structure applies a compressive force between the first and second point of support along the compressive axis to hold the transfer member in a bowed first state or a bow ed second state. A control signal is applied to a heating element in the expandable structure to reduce the compressive force transferring the transf er member to a second state. The central portion of the transfer member moves from a bowed first state past the compressive axis into a bowed second state to clear the optical axis.

    FIBER OPTIC DISPLACEMENT SENSOR
    35.
    发明专利
    FIBER OPTIC DISPLACEMENT SENSOR 未知

    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.

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