中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

39 records (took 0.021 seconds)

    APPARATUS AND METHOD FOR SCALE FACTOR STABILIZATION IN INTERFEROMETRIC FIBER OPTIC ROTATION SENSORS
    22.
    发明专利
    APPARATUS AND METHOD FOR SCALE FACTOR STABILIZATION IN INTERFEROMETRIC FIBER OPTIC ROTATION SENSORS 未知

    公开(公告)号：CA2240086A1

    公开(公告)日：1999-01-23

    申请号：CA2240086

    申请日：1998-06-08

    Applicant: LITTON SYSTEMS INC

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

    IPC: G01C19/72

    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 opti cal 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-propag ating 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.

    POTTED FIBER OPTIC GYRO SENSOR COIL FOR STRINGENT VIBRATION AND THERMAL ENVIRONMENTS
    23.
    发明专利
    POTTED FIBER OPTIC GYRO SENSOR COIL FOR STRINGENT VIBRATION AND THERMAL ENVIRONMENTS 未知

    公开(公告)号：CA2126034A1

    公开(公告)日：1995-12-17

    申请号：CA2126034

    申请日：1994-06-16

    Applicant: LITTON SYSTEMS INC

    Inventor： CORDOVA AMADO ,  SURABIAN GLENN M

    IPC: G01C19/72

    Abstract: A sensor coil for a fiber optic gyroscope is potted in polymer-based material selected for avoiding such temperature-related anomalies as bias spikes and bias crossings. The potting material is based upon a silicone composition characterized by a glass transition temperature that lies below and outside the operational range required for commercial or military operation. Predetermined fillers may be added to the silicone for bolstering stiffness (Young's modulus) within the polymer's rubbery region to reduce the gyro's bias sensitivity to vibration. Excellent bias thermal and vibration performance has been achieved with coils potted in silicone adhesive with a carbon-black filler.

    24.
    发明专利
    未知

    公开(公告)号：DE69725275T2

    公开(公告)日：2004-08-12

    申请号：DE69725275

    申请日：1997-06-26

    Applicant: LITTON SYSTEMS INC

    Inventor： MARK G ,  TAZARTES A ,  CORDOVA AMADO ,  CHERBETTCHIAN H ,  GOLDNER L

    IPC: G01C19/72

    Abstract: A gyroscope assembly (10) includes a ring-shaped fiber optic coil (14) and a coil conforming enclosure (12, 16) of high magnetic permeability ferromagnetic material. The enclosure is ring-shaped to conform with the shape of the coil, and includes a portion (22) extending within the internal hole of the coil ring. Therefore, the coil is intimately and fully encased within high magnetic permeability material. In particular, the enclosure comprises a coil supporting spool (12) and a cover (16) secured to the spool. The spool includes a base (18) which is provided with a central hole (20) and a tubular wall (22) extending perpendicularly from the base. Coil (14) is bonded to base (18). Both the spool and the cover are formed of high magnetic permeability material, and the cover is placed about the fiber optic coil and attached to the spool. The coefficient of thermal expansion material used for the spool is matched to that of the coil pack to minimize stress imposed upon the fiber. An outer shield (28), roughly cylindrical in shape, may be further attached to the outside of the inner, toroidal shield, and the two shields are separated by a layer of low magnetic permeability material, such as of low magnetic permeability stainless steel or aluminum.

    25.
    发明专利
    未知

    公开(公告)号：DE69725275D1

    公开(公告)日：2003-11-06

    申请号：DE69725275

    申请日：1997-06-26

    Applicant: LITTON SYSTEMS INC

    Inventor： MARK G ,  TAZARTES A ,  CORDOVA AMADO ,  CHERBETTCHIAN H ,  GOLDNER L

    IPC: G01C19/72

    Abstract: A gyroscope assembly (10) includes a ring-shaped fiber optic coil (14) and a coil conforming enclosure (12, 16) of high magnetic permeability ferromagnetic material. The enclosure is ring-shaped to conform with the shape of the coil, and includes a portion (22) extending within the internal hole of the coil ring. Therefore, the coil is intimately and fully encased within high magnetic permeability material. In particular, the enclosure comprises a coil supporting spool (12) and a cover (16) secured to the spool. The spool includes a base (18) which is provided with a central hole (20) and a tubular wall (22) extending perpendicularly from the base. Coil (14) is bonded to base (18). Both the spool and the cover are formed of high magnetic permeability material, and the cover is placed about the fiber optic coil and attached to the spool. The coefficient of thermal expansion material used for the spool is matched to that of the coil pack to minimize stress imposed upon the fiber. An outer shield (28), roughly cylindrical in shape, may be further attached to the outside of the inner, toroidal shield, and the two shields are separated by a layer of low magnetic permeability material, such as of low magnetic permeability stainless steel or aluminum.

    REDUCTION OF FIBER OPTIC GYROSCOPE VIBRATION AND TEMPERATURE-RAMP SENSITIVITIES BY CONTROLLING COIL GEOMETRICAL PARAMETERS
    28.
    发明专利
    REDUCTION OF FIBER OPTIC GYROSCOPE VIBRATION AND TEMPERATURE-RAMP SENSITIVITIES BY CONTROLLING COIL GEOMETRICAL PARAMETERS 未知

    公开(公告)号：CA2235259A1

    公开(公告)日：1998-10-23

    申请号：CA2235259

    申请日：1998-04-21

    Applicant: LITTON SYSTEMS INC

    Inventor： CORDOVA AMADO

    IPC: G01C19/72

    Abstract: A method for providing an optical fiber coil having reduced bias vibration and bias temperature-ramp sensitivity by controlling and adjusting coil geometrical factors including the coil potted length, the adhesive layer thickness, the number of tu rns per layer, the number of layers and the way the winding is terminated. The windings may be terminated to form the coil as a complete quadrupole, a diapole, an incomplet e quadrupole or an incomplete diapole. By adjusting geometrical factors of the coi l design, a coil for which the residual net Shupe bias is negligible is obtained.

Patent Agency Ranking