公开(公告)号：US4773759A

公开(公告)日：1988-09-27

申请号：US049805

申请日：1987-05-12

申请人： Ralph A. Bergh ,  Brian Culshaw ,  Herve C. Lefevre ,  Herbert J. Shaw ,  C. Chapin Cutler

发明人： Ralph A. Bergh ,  Brian Culshaw ,  Herve C. Lefevre ,  Herbert J. Shaw ,  C. Chapin Cutler

IPC分类号： G01B9/02 ,  G01C19/72 ,  G01C19/64

CPC分类号： G01C19/72

摘要： A fiber optic interferometer provides Kerr effect compensation by intensity modulating counterpropagating waves of unequal intensity such that the average value of the square of the intensity is equal to a constant times the average value of the intensity squared, the constant preferably being equal to about two. The intensity modulation may be achieved by using a modulator in combination with a light source or by using a source in which plural frequencies combine to provide the modulation.

摘要翻译： 光纤干涉仪通过强度调制不等强度的反向传播波提供克尔效应补偿，使得强度平方的平均值等于强度平方值的平均值的常数，该常数优选等于约2。 可以通过使用与光源组合的调制器或通过使用多个频率组合以提供调制的源来实现强度调制。

公开(公告)号：US4733938A

公开(公告)日：1988-03-29

申请号：US829421

申请日：1986-02-13

申请人： Herve C. Lefevre ,  Ralph A. Bergh

发明人： Herve C. Lefevre ,  Ralph A. Bergh

IPC分类号： G01R33/032 ,  G02F1/09 ,  G02B6/16

CPC分类号： G02F1/09 ,  G01R33/0322

摘要： A single, continuous strand of fiber optic material is wrapped about a mandrel to form oval-shaped loops having parallel sides and curved ends. A magnet is positioned so that its B-field is substantially parallel to the straight portions of the loops. As light propagates through these straight portions of the loops, its direction of polarization is rotated in accordance with the Faraday effect. The curved portions are formed to create sufficient linear birefrigence to provide a phase difference of 180 degrees between light in the two orthogonal polarization modes of the fiber. This advantageously causes the Faraday rotations in each of the straight portions to add, rather than cancel. The magneto-optic rotator of the present invention is useful in a variety of applications such as an optical isolator, a modulator, and a magnetometer.

摘要翻译： 围绕心轴缠绕单根连续的光纤材料束，以形成具有平行侧面和弯曲端部的椭圆形环。 磁体被定位成使得其B场基本上平行于环的直线部分。 当光传播通过环的这些直线部分时，其偏振方向根据法拉第效应旋转。 形成弯曲部分以产生足够的线性双折射以在光纤的两个正交偏振模式中的光之间提供180度的相位差。 这有利地导致每个直线部分中的法拉第旋转增加而不是取消。 本发明的磁光旋转器可用于各种应用中，例如光隔离器，调制器和磁力计。

公开(公告)号：US4615582A

公开(公告)日：1986-10-07

申请号：US319421

申请日：1981-11-09

申请人： Herve C. Lefevre ,  Ralph A. Bergh

发明人： Herve C. Lefevre ,  Ralph A. Bergh

IPC分类号： G02B6/02 ,  G01R33/032 ,  G02B27/28 ,  G02F1/09 ,  G02B6/16

CPC分类号： G01R33/0322 ,  G02F1/09

摘要： A single, continuous strand of fiber optic material is wrapped about a mandrel to form oval-shaped loops having parallel sides and curved ends. A magnet is positioned so that its B-field is substantially parallel to the straight portions of the loops. As light propagates through these straight portions of the loops, its direction of polarization is rotated in accordance with the Faraday effect. The curved portions are formed to create sufficient linear birefringence to provide a phase difference of 180 degrees between light in the two orthogonal polarization modes of the fiber. This advantageously causes the Faraday rotations in each of the straight portions to add, rather than cancel. The magneto-optic rotator of the present invention is useful in a variety of applications such as an optical isolator, a modulator, and a magnetometer.

摘要翻译： 围绕心轴缠绕单根连续的光纤材料束，以形成具有平行侧面和弯曲端部的椭圆形环。 磁体被定位成使得其B场基本上平行于环的直线部分。 当光传播通过环的这些直线部分时，其偏振方向根据法拉第效应旋转。 形成弯曲部分以产生足够的线性双折射以在光纤的两个正交偏振模式中的光之间提供180度的相位差。 这有利地导致每个直线部分中的法拉第旋转增加而不是取消。 本发明的磁光旋转器可用于各种应用中，例如光隔离器，调制器和磁力计。

公开(公告)号：US4410275A

公开(公告)日：1983-10-18

申请号：US249714

申请日：1981-03-31

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

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

IPC分类号： G01C19/64 ,  G01P3/36 ,  G01B9/02

CPC分类号： G01C19/64

摘要： Rotation sensor having a loop of fiber optic material in which counter propagating waves are generated with a phase relationship corresponding to the rate at which the loop is rotated. All fiber optic components are employed in the system for directing the light to and from the loop and establishing, maintaining and controlling proper polarization of the light. In one particularly preferred embodiment, the loop and other components are formed on a single strand of fiber optic material which extends continuously through the system.

摘要翻译： 旋转传感器具有光纤材料环，其中以相对于循环旋转速率的相位关系产生反向传播波。 系统中采用了所有光纤组件，用于将光引导到环路和从环路引导，并建立，维护和控制光的适当极化。 在一个特别优选的实施例中，环和其它部件形成在连续延伸通过系统的单根光纤材料上。

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：US4389090A

公开(公告)日：1983-06-21

申请号：US183975

申请日：1980-09-04

申请人： Herve C. LeFevre

发明人： Herve C. LeFevre

IPC分类号： G02B6/10 ,  G02B26/00 ,  G02F1/01 ,  G02B5/172

CPC分类号： G02B26/00 ,  G02B6/105 ,  G02F1/0134 ,  Y10S359/90

摘要： Fiber optic device for controlling the state of polarization of light. In one embodiment, a strand of fiber optic material is bent into a generally planar coil of relatively tight radius to stress the material and form a birefringent medium having principal axes which are rotated to control the polarization of light passing through the strand. In a second embodiment, one portion of a fiber optic strand is twisted about its axis to change the polarization, and a second portion of the strand is formed into a coil which is free to change in radius without additional twisting as the first portion is twisted.

摘要翻译： 用于控制光的偏振状态的光纤装置。 在一个实施例中，将一束光纤材料弯曲成相对紧密半径的大致平面的线圈，以对材料施加应力并形成双折射介质，该双折射介质的主轴被旋转以控制通过该线束的光的偏振。 在第二实施例中，光纤股的一部分围绕其轴线扭转以改变偏振，并且股线的第二部分形成为线圈，其随着第一部分被扭曲而自由地改变半径而不需要额外的扭转 。

公开(公告)号：US4687330A

公开(公告)日：1987-08-18

申请号：US488111

申请日：1983-04-25

申请人： Herve C. Lefevre

发明人： Herve C. Lefevre

IPC分类号： G01C19/72 ,  G01C19/64

CPC分类号： G01C19/726

摘要： A fiber optic rotation sensor, employing the Sagnac effect comprising all fiber optic components positioned along a continuous, uninterrupted strand of fiber optic material. The rotation sensor includes a detection system utilizing a modulator or modulators for phase modulating at first and second harmonic frequencies light waves which counter-propagate through a loop formed in the fiber optic strand. Each modulator is operated at a specific frequency to eliminate amplitude modulation in the detected optical output signal.A phase sensitive detector generates a feedback error signal proportional to the magnitude of the first harmonic in the output optical signal. The feedback error signal controls a modulator which controls the amplitude of the second harmonic driving signal for the second harmonic phase modulator such that the first harmonic component in the output signal from the rotation sensor is cancelled or held within a small range of amplitudes.

摘要翻译： 一种光纤旋转传感器，采用Sagnac效应，其包括沿连续的不间断的光纤材料股定位的所有光纤部件。 旋转传感器包括利用调制器或调制器的检测系统，用于在第一和第二谐波频率处对通过形成在光纤链中的环路进行反向传播的光波进行相位调制。 每个调制器以特定频率操作，以消除所检测的光输出信号中的幅度调制。 相敏检测器产生与输出光信号中的一次谐波幅度成比例的反馈误差信号。 反馈误差信号控制调制器，其控制用于二次谐波相位调制器的二次谐波驱动信号的幅度，使得来自旋转传感器的输出信号中的一次谐波分量被取消或保持在小幅度范围内。