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    Apparatus for thermal tuning of path length control drivers
    5.
    发明授权
    Apparatus for thermal tuning of path length control drivers 失效
    路线长度控制驱动器热调节装置

    公开(公告)号：US5148076A

    公开(公告)日：1992-09-15

    申请号：US682840

    申请日：1991-04-09

    Applicant: Steven C. Albers ,  Timothy J. Callaghan ,  Bruce A. Seiber ,  Theodore A. Toth ,  Robert W. Derry ,  Theodore J. Podgorski

    Inventor： Steven C. Albers ,  Timothy J. Callaghan ,  Bruce A. Seiber ,  Theodore A. Toth ,  Robert W. Derry ,  Theodore J. Podgorski

    IPC: G01C19/66 ,  H01S3/083

    CPC classification number: G01C19/665

    Abstract: A path length control driver apparatus includes a base plate having a first central member having first and second opposite ends, a first outer rim membr and a first flexible annular diaphragm area having first and second opposite sides. The first flexible annular diaphragm area is between and integral with the first central member and the first outer rim member. A central axis passes centrally through the first and second opposite ends of the first central member. A first piezoelectric ceramic material has first and second opposing sides and the first side of the first piezoelectric ceramic material is rigidly affixed to the first flexible annular diaphragm area's first side. A second piezoelectric ceramic material has first and second opposing sides and the first side of the second piezolectric ceramic material is rigidly affixed to the first flexible annular diaphragm area's second side. A first annular ring electrode is rigidly affixed to the second side of the first piezoelectric ceramic material, and a second annular ring electrode is rigidly affixed to the second side of the second piezoelectric ceramic material. The first and second electrodes have selected annular ring widths of different sizes to provide a selected temperature sensitivity of movement of the central member along the central axis.

    Gyroscope mode shift detection and scale factor compensation
    6.
    发明授权
    Gyroscope mode shift detection and scale factor compensation 有权
    陀螺仪模式移位检测和比例因子补偿

    公开(公告)号：US07916302B2

    公开(公告)日：2011-03-29

    申请号：US11750773

    申请日：2007-05-18

    Applicant: David O. Fellows ,  Ying Tan ,  Timothy J. Callaghan ,  Christina M. Schober

    Inventor： David O. Fellows ,  Ying Tan ,  Timothy J. Callaghan ,  Christina M. Schober

    IPC: G01B9/02

    CPC classification number: G01C19/68 ,  G01C19/665 ,  H01S3/0835 ,  H01S3/2222

    Abstract: A method for maintaining measurement accuracy of a ring laser gyroscope is disclosed. The method involves periodically measuring a path length control voltage in the ring laser gyroscope over a prescribed temperature range. When a first path length controlled by the path length control voltage deviates at least one wavelength from a nominal path length, the method detects the change in the path length as a mode shift. For each mode shift, the method applies a path length correction to maintain the first path length at a target path length over the prescribed temperature range. The method can apply a correction to a measurement signal output of the ring laser gyroscope by adjusting a calibrated scale factor depending on an actual integer number of wavelengths achieved during a mode shift.

    Abstract translation: 公开了一种用于维持环形激光陀螺仪的测量精度的方法。 该方法包括在规定的温度范围内周期性地测量环形激光陀螺仪中的路径长度控制电压。 当由路径长度控制电压控制的第一路径长度从标称路径长度偏离至少一个波长时，该方法将路径长度的变化检测为模式偏移。 对于每个模式移位，该方法应用路径长度校正以将第一路径长度保持在超过规定温度范围的目标路径长度。 该方法可以通过根据在模式移位期间实现的实际波长的实数整数来调整校准的比例因子来对环形激光陀螺仪的测量信号输出进行校正。

    High temperature electrode seal in a ring laser gyro
    7.
    发明授权
    High temperature electrode seal in a ring laser gyro 失效
    环形激光陀螺仪中的高温电极密封

    公开(公告)号：US06704111B2

    公开(公告)日：2004-03-09

    申请号：US09952302

    申请日：2001-09-11

    Applicant: Steven P. Ecklund ,  Timothy J. Callaghan ,  Lisa P. Koland

    Inventor： Steven P. Ecklund ,  Timothy J. Callaghan ,  Lisa P. Koland

    IPC: G01C1966

    CPC classification number: G01C19/661 ,  H01S3/0388

    Abstract: A ring laser gyro having a high temperature seal. The ring laser gyro includes a laser block of known construction having a closed loop passage formed within the block in the shape of a polygon. Mirrors positioned at the intersection of each side of the polygon-shaped closed loop passage create an optical closed loop path through passage. A lasing gas is sealed within the closed loop passage, and electrodes mounted to the block and in fluid communication with the passage create at least one laser that traverses the optical closed loop path in the passage. The electrodes are mounted on the laser block with a high temperature seal comprising a washer having a low coefficient of thermal expansion and an optical bond between the washer and the laser block In a preferred embodiment, the laser block and the washer are formed from the same material to ensure that these structures expand at substantially the same rate when the ring laser gyro is used in a high temperature application.

    Abstract translation: 具有高温密封的环形激光陀螺仪。 环形激光陀螺仪包括已知结构的激光器块，其具有形成在多边形形状的块内的闭环通道。 位于多边形闭环通道的每一侧的交叉处的镜子形成通过光学闭环路径。 激光气体密封在闭环通道内，并且安装到块上并与通道流体连通的电极产生穿过通道中的光学闭环路径的至少一个激光器。 电极通过高温密封件安装在激光器块上，该高温密封件包括具有低热膨胀系数的垫圈和垫圈与激光块之间的光学接合。在一个优选实施例中，激光块和垫圈由相同的 材料，以确保当环形激光陀螺在高温应用中使用时这些结构以基本上相同的速率膨胀。

    Laser gyro screening method for predicting angular random walk
    8.
    发明授权
    Laser gyro screening method for predicting angular random walk 失效
    用于预测角随机游走的激光陀螺仪筛选方法

    公开(公告)号：US5434670A

    公开(公告)日：1995-07-18

    申请号：US160014

    申请日：1993-11-30

    Applicant: Steven C. Albers ,  Timothy J. Callaghan

    Inventor： Steven C. Albers ,  Timothy J. Callaghan

    IPC: G01C19/66

    CPC classification number: G01C19/66

    Abstract: A screening method for a ring laser gyro capable of more accurately predicting the gyro's angular random walk upon completion of the built process is disclosed. A strong correlation exists between the angular random walk and a scale factor pulling term. Scale factor pulling is equivalent to the scale factor deviation measured at two rotational rates plus a positive scale factor correction term and is indicative of the effect of lockin on the scale factor. This screening method allows the removal of high ARW units from the production line at a point early on in their processing. By removing these gyros at this point in processing, unnecessary production steps and unnecessary value added operations are eliminated.

    Abstract translation: 公开了一种环形激光陀螺仪的筛选方法，该方法能够在完成内置过程后更准确地预测陀螺仪的角随机散射。 角随机游走与比例因子拉伸项之间存在很强的相关性。 比例因子拉动等效于在两个旋转速率加上正比例因子校正项测量的比例因子偏差，并且表示锁定对比例因子的影响。 这种筛选方法允许在处理早期的某一时刻从生产线上移除高ARW单元。 通过在处理中移除这些陀螺仪，消除了不必要的生产步骤和不必要的增值操作。

    Single gyro northfinder
    9.
    发明授权
    Single gyro northfinder 失效
    单陀螺北极

    公开(公告)号：US5369889A

    公开(公告)日：1994-12-06

    申请号：US882865

    申请日：1986-07-07

    Applicant: Timothy J. Callaghan ,  Werner H. Egli

    Inventor： Timothy J. Callaghan ,  Werner H. Egli

    IPC: G01C19/38 ,  G01C19/00

    CPC classification number: G01C19/38

    Abstract: Disclosed is a northfinding apparatus having a single rotation rate sensor secured to a platform. The output of the rotation rate sensor is corrected for tilt and tilt rate of the platform. Measurements of the tilt and tilt rate and the rotation rate are combined to provide an azimuth angle of the platform relative to north.

    Abstract translation: 公开了一种具有固定到平台的单个转速传感器的检偏装置。 根据平台的倾斜和倾斜率来校正转速传感器的输出。 结合倾斜和倾斜速度和旋转速率的测量来提供平台相对于北部的方位角。

    Readout apparatus for a ring laser angular rate sensor
    10.
    发明授权
    Readout apparatus for a ring laser angular rate sensor 失效
    环形激光角速度传感器读出装置

    公开(公告)号：US4533250A

    公开(公告)日：1985-08-06

    申请号：US484108

    申请日：1983-04-11

    Applicant: Timothy J. Callaghan ,  Robert M. Kay

    Inventor： Timothy J. Callaghan ,  Robert M. Kay

    IPC: G01C19/66 ,  G01C19/64

    CPC classification number: G01C19/662

    Abstract: In the present invention, a detector responsive to an interference pattern produces pulses which relate to the fringe change of the pattern. The pulses are timed by a running clock. The pulse times are fed to an interpolating means such as a computer for interpolating fringe change between the last pulse and a measurement command signal. The detector of the present invention is specifically applicable to ring laser angular rate sensor systems.

    Abstract translation: 在本发明中，响应于干涉图案的检测器产生与图案的边缘变化有关的脉冲。 脉冲由运行时钟定时。 脉冲时间被馈送到内插装置，例如计算机，用于内插最后脉冲和测量命令信号之间的条纹变化。 本发明的检测器特别适用于环形激光角速度传感器系统。

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