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    11.
    发明专利
    未知

    公开(公告)号：DE69826788D1

    公开(公告)日：2004-11-11

    申请号：DE69826788

    申请日：1998-06-25

    Applicant: LITTON SYSTEMS INC

    Inventor： STEELE JAMES R ,  CORDOVA AMADO ,  GOLDNER ERIC LEE

    IPC: G01C19/72 ,  H01S3/06

    Abstract: A fiber optic rotation sensor system having improved scale factor stability includes an optically pumped gain fiber arranged to provide optical signals to an integrated optics chip connected to a fiber optic sensing coil. An optical coupler receives optical signals from the gain fiber and provides the optical signals to an optical fiber. The optical fiber is arranged to guide optical signals from the optical coupler along an optical path toward the integrated optics chip such that optical signals from the gain fiber are input to the fiber optic sensing coil to form counter-propagating waves therein. The counter-propagating waves traverse the sensing coil and then combine in the integrated optics chip to form a gyro output signal. A depolarizer is placed in the optical path between the first optical coupler and the integrated optics chip to prevent random changes in the state of polarization of optical signals propagating between the gain fiber and the integrated optic chip.

    12.
    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.

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