公开(公告)号：US4869592A

公开(公告)日：1989-09-26

申请号：US149140

申请日：1988-01-27

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G01C19/72 ,  H01S3/083

CPC分类号： G01C19/721 ,  G01C19/726

摘要： In a closed loop fiber optic gyroscope, the counter-propagating lightwaves are phase modulated by a triangular wave modulation with the triangular wave skewed to lock the phase difference between the counter-propagating waves alternately to specific values of phase difference which are greater than and less than the phase difference due to rotation. The difference in elapsed time between the up-slope and down-slope portions of the triangular wave modulation yields a measure of rotation angle, whereas such difference in elapsed time divided by total elapsed time yields a measure of rotation rate. The phase difference is further modulated about the locked values at a higher frequency, such higher frequency phase difference modulation being synchronously detected to produce a rotation rate signal component employed to generate the skewed triangular wave. Various other features are employed to light polarization errors.

摘要翻译： 在闭环光纤陀螺仪中，反向传播光波被三角波调制相位调制，三角波偏移，将反向传播波之间的相位差交替地锁定到相位差大于或等于的相位差 比由于旋转的相位差。 三角波调制的上斜坡部分和下坡部分之间的经过时间的差异产生旋转角度的测量值，而经过时间的差除以总耗用时间产生旋转速度的量度。 相位差被进一步调制在较高频率处的锁定值，这种较高频率相位差调制被同步检测以产生用于产生偏斜三角波的旋转速率信号分量。 采用各种其它特征来发光偏振误差。

公开(公告)号：US4493528A

公开(公告)日：1985-01-15

申请号：US139511

申请日：1980-04-11

申请人： Herbert J. Shaw ,  Ralph A. Bergh

发明人： Herbert J. Shaw ,  Ralph A. Bergh

IPC分类号： G02B6/28 ,  G02B6/35 ,  G02B7/26

CPC分类号： G02B6/3536 ,  G02B6/2826 ,  G02B6/283 ,  G02B6/3594 ,  Y10S359/90

摘要： Apparatus and method of manufacture for coupling optical power between two strands of fiber optic material in a given direction of propagation. The coupler employs generally parallel, intersecting strands of fiber optic material having the cladding removed on one side thereof to within a few microns of the fiber cores in the region of intersection to permit light transfer between the strands.

公开(公告)号：US09518827B2

公开(公告)日：2016-12-13

申请号：US13696258

申请日：2011-05-07

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G01C19/72

CPC分类号： G01C19/728 ,  G01C19/721

摘要： A method and system for transmitting source light to a plurality of Sagnac interferometers includes a first directional coupler that splits the source light into a second light beam and a third light beam. The second light beam supplies light to a first Sagnac interferometer and the second light beam supplies light to a second directional coupler, and the first directional coupler also delivers light returning from the first Sagnac interferometer to a first detector that is used to indicate rotation of the first Sagnac interferometer. The second directional coupler splits the third light beam into a fourth light beam and a fifth light beam, and the fourth light beam supplies light to a second Sagnac interferometer. The second directional coupler delivers light returning from the second Sagnac interferometer to a second detector, and the second detector provides a signal indicative of rotation of the second Sagnac interferometer.

摘要翻译： 用于将源光发射到多个Sagnac干涉仪的方法和系统包括将源光分成第二光束和第三光束的第一定向耦合器。 第二光束向第一Sagnac干涉仪提供光，第二光束将光提供给第二定向耦合器，并且第一定向耦合器还将从第一Sagnac干涉仪返回的光传送到第一检测器，该第一检测器用于指示 首先是Sagnac干涉仪。 第二定向耦合器将第三光束分成第四光束和第五光束，第四光束将光提供给第二Sagnac干涉仪。 第二定向耦合器将从第二Sagnac干涉仪返回的光传递到第二检测器，并且第二检测器提供指示第二Sagnac干涉仪旋转的信号。

公开(公告)号：US20140218739A1

公开(公告)日：2014-08-07

申请号：US13950637

申请日：2013-07-25

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G01C19/64

CPC分类号： G01C19/64 ,  G01B9/02049 ,  G01B9/0209 ,  G01C19/72

摘要： An interferometer employed, in part, as a Sagnac interferometer or fiber optic gyro (FOG) includes a light source that provides a source light wave that is split into first and second light waves that are directed to traverse a defined optical loop path in opposite directions. The defined optical loop path in accordance with the present invention is provided by multiple waveguides wound into a coil such that the opposite traveling first and second light waves serially travel through all of the waveguides in opposite directions around the optical loop path.

摘要翻译： 一部分用作Sagnac干涉仪或光纤陀螺（FOG）的干涉仪包括提供源光波的光源，该光源被分成第一和第二光波，所述第一和第二光波被引向以相反方向穿过限定的光环路径 。 根据本发明的限定的光环路径由缠绕到线圈中的多个波导提供，使得相对的行进的第一和第二光波在光环路径周围以相反方向串行地穿过所有的波导。

公开(公告)号：US5528715A

公开(公告)日：1996-06-18

申请号：US512144

申请日：1995-08-07

申请人： Randy P. Goettsche ,  Ralph A. Bergh

发明人： Randy P. Goettsche ,  Ralph A. Bergh

IPC分类号： G01C19/72 ,  G02B6/00 ,  G02B6/02 ,  G02B6/44 ,  G02B6/04 ,  B65H18/28 ,  G01B9/02

CPC分类号： G02B6/4457 ,  G01C19/722

摘要： In a optical fiber coil arrangement for use in rotation sensors, for example, axial and/or radial errors can be reduced or substantially eliminated by employing trimming lengths of the first and second ends of the optical fiber used to wind the coil. The first and second ends are spatially separated from one another so as to reduce such errors. The trimming lengths may be in the form of trimming turns. To eliminate axial errors, the first end is formed into a first number of trimming turns and the second end is formed into a second number of trimming turns so that the first and second number of trimming turns are spatially offset from each other in an axial direction. To eliminate radial errors, the first end is formed into a first number of trimming turns and the second end is formed into a second number of trimming turns so that the first and second number of trimming turns are spatially offset from each other in a radial direction. Radial and axial compensation may be combined.

摘要翻译： 在用于旋转传感器的光纤线圈装置中，例如，可以通过采用用于缠绕线圈的光纤的第一和第二端的修整长度来减小或基本消除轴向和/或径向误差。 第一和第二端在空间上彼此分离，以便减少这种误差。 修剪长度可以是修剪轮廓的形式。 为了消除轴向误差，第一端被形成为第一数量的修整匝，并且第二端形成第二数量的修整匝，使得第一和第二数量的修整匝在轴向上彼此空间上偏移 。 为了消除径向误差，第一端形成为第一数量的修整匝，并且第二端形成第二数量的修整匝，使得第一和第二数量的修整匝在径向上彼此空间上偏移 。 径向和轴向补偿可以组合。

公开(公告)号：US5120130A

公开(公告)日：1992-06-09

申请号：US413371

申请日：1989-09-27

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G01C19/72

CPC分类号： G01C19/721

摘要： A fiber optic rotation sensor comprises a fiber optic interferometer loop formed from a highly birefringent optical fiber, and a short coherence length source for introducing light into the interferometer loop to provide a pair of waves which counter-propogate therethrough. A detector is included to detect the phase difference between the waves after they have traversed the loop to provide an indication of the loop rotation rate, in accordance with the Sagnac effect. Phase errors are reduced by selecting the coherence length of the source and the birefringence of the fiber, so that the loop is comprised of plural fiber coherence lengths. The term "fiber coherence length" should be distinguished from source coherence length. Fiber coherence length is the length of fiber required for the optical path length difference between the two polarization modes of a single mode fiber to equal one coherence length of the light source.In addition, phase errors are reduced by providing a birefringent waveguide between the source and the loop such that light propagates from the source to the loop in an optical path having a path length difference which is at least equal to a coherence length of the source. Phase errors are further reduced by positioning the detector to intercept the optical output signal from the loop such that light wave components in orthogonal modes are spatially averaged.

摘要翻译： 光纤旋转传感器包括由高双折射光纤形成的光纤干涉仪环路和用于将光引入干涉仪环路的短相干长度源，以提供一对通过其反向传播的波形。 包括一个检测器，用于根据Sagnac效应来检测波在它们经过环路之后的相位差以提供循环旋转速率的指示。 通过选择源的相干长度和纤维的双折射来减小相位误差，使得该环由多个纤维相干长度组成。 术语“纤维相干长度”应与源相干长度区分开来。 光纤相干长度是单模光纤的两个偏振模式之间的光程长度差要等于光源相干长度所需的光纤长度。 此外，通过在源极和环路之间提供双折射波导来减小相位误差，使得光在具有至少等于源的相干长度的路径长度差的光路中从源传播到环路。 通过将检测器定位以截取来自环路的光输出信号，使得正交模式中的光波分量在空间上被平均，进一步减小了相位误差。

公开(公告)号：US4671658A

公开(公告)日：1987-06-09

申请号：US319311

申请日：1981-11-09

申请人： Herbert J. Shaw ,  Ralph A. Bergh ,  Herve C. Lefevre

发明人： Herbert J. Shaw ,  Ralph A. Bergh ,  Herve C. Lefevre

IPC分类号： G01C19/72 ,  G01P3/36 ,  G01C19/64

CPC分类号： G01C19/72

摘要： A fiber optic rotation sensor, employing the Sagnac effect, comprises all fiber optic components, positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator for phase modulating light waves which counterpropagate through a loop formed in the fiber optic strand. The modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal. The rotation sensor is mounted in a .mu.-metal housing to shield it from the effects of ambient magnetic fields. An isolator is utilized to prevent the optical output signal from returning to the laser source. This advantageously reduces power losses in the system by eliminating the need for a coupler to couple the output signal to a detector.

摘要翻译： 使用Sagnac效应的光纤旋转传感器包括沿着连续的，不间断的光纤材料束定位的所有光纤部件。 旋转传感器包括利用调制器的检测系统，该调制器用于相位调制通过在光纤链中形成的环路而反向传播的光波。 调制器以特定频率工作，以消除所检测的光输出信号中的幅度调制。 旋转传感器安装在金属外壳中，以防止环境磁场的影响。 使用隔离器来防止光输出信号返回激光源。 这有利地通过消除对耦合器将输出信号耦合到检测器的需要来减少系统中的功率损耗。

公开(公告)号：US4536058A

公开(公告)日：1985-08-20

申请号：US300955

申请日：1981-09-10

申请人： Herbert J. Shaw ,  Ralph A. Bergh

发明人： Herbert J. Shaw ,  Ralph A. Bergh

IPC分类号： G02B6/00 ,  G01N37/00 ,  G02B6/24 ,  G02B6/28 ,  G02B27/00

CPC分类号： G02B6/2826 ,  G02B6/283 ,  Y10S359/90

摘要： A fiber optic directional coupler comprises a pair of bases, with respective longitudinal, arcuate grooves formed therein on confronting faces thereof, for mounting a pair of optical fibers in close proximity. A portion of the cladding is removed from each of the fibers to form planar facing surfaces which permits the spacing between the fiber cores to be within a predetermined critical zone so that guided modes of the fibers interact, through their evanescent fields, to cause light to be transferred by evanescent field coupling between the fibers. The coupler is "tuned" to a desired coupling efficiency by offsetting the planar facing surfaces to increase the spacing between the fiber cores. A method of manufacture of the coupler includes procedures which permit the coupler halves to be made symmetrical. The method also permits couplers having given coupling characteristics to be reproduced.

摘要翻译： 光纤定向耦合器包括一对基座，在其相对的表面上形成有各自的纵向弧形槽，用于将一对光纤安装在紧邻处。 从每个纤维中去除包层的一部分以形成平面相对表面，其允许纤维芯之间的间隔在预定的临界区内，使得纤维的引导模式通过它们的渐逝场相互作用，以使光线 通过纤维之间的ev逝场耦合传递。 耦合器通过抵消平面相对表面以增加光纤芯之间的间距而被“调谐”到期望的耦合效率。 耦合器的制造方法包括允许耦合器半部对称的过程。 该方法还允许具有给定耦合特性的耦合器被再现。

公开(公告)号：US08610995B2

公开(公告)日：2013-12-17

申请号：US13388924

申请日：2010-07-14

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G02F1/01

CPC分类号： G01C19/726

摘要： An occasional calibration waveform is used to, first, make an interferometer sensitive to small changes in Sagnac phase difference due to rotating the gyroscope (this is commonly referred to as biasing the interferometer); second, supply a feedback phase difference to keep the interferometer sensitive to small changes in rotation rate; and third, supply the calibration modulation necessary to keep the digital electronics calibrated with respect to the Sagnac phase difference being measured.

摘要翻译： 使用偶尔的校准波形，首先，由于旋转陀螺仪（这通常称为偏置干涉仪），使干涉仪对Sagnac相位差的小变化敏感; 第二，提供反馈相位差，以保持干涉仪对转速的小变化敏感; 第三，提供必要的校准调制，以使数字电子装置相对于被测量的Sagnac相位差校准。

公开(公告)号：US20130050709A1

公开(公告)日：2013-02-28

申请号：US13695858

申请日：2011-05-02

申请人： Ralph A. Bergh

发明人： Ralph A. Bergh

IPC分类号： G02B6/26 ,  G01C19/72 ,  G01B9/02 ,  G02B6/255

CPC分类号： G01C19/72 ,  G02B6/29347

摘要： A method in which a ribbon fiber, containing a plurality of waveguides each having a first end and a second end, is wound into a coil and the second end of a first waveguide is coupled together with the first end of a second waveguide such that light in said first waveguide will transfer to said second waveguide.

摘要翻译： 一种方法，其中包含多个波导的带状光纤，每个波导具有第一端和第二端，被卷绕成线圈，并且第一波导的第二端与第二波导的第一端耦合在一起，使得光 在所述第一波导中将传送到所述第二波导。