公开(公告)号：US06765678B2

公开(公告)日：2004-07-20

申请号：US10041192

申请日：2002-01-08

Applicant: Lee K. Strandjord ,  Glen A. Sanders

Inventor： Lee K. Strandjord ,  Glen A. Sanders

IPC: G01C1972

CPC classification number: G01C19/721 ,  H01S3/06795

Abstract: A system and method is provided which suppresses relative intensity noise in a fiber optic gyroscope by taking advantage of the frequency response of erbium fiber. In operation, the gain provided by the erbium fiber is added to the gain of the other components in the feedback loop to provide for stable loop performance up to about 250 kHz. The frequency response of the erbium fiber of about 3 kHz also provides a 6 db per octave roll-off, which, when used in a negative feedback control loop for controlling the current flowing to the gyroscope light source, allows for a relative intensity noise control loop with a bandwidth much greater than 3 kHz; this may be used in high performance gyroscope applications.

Abstract translation: 提供一种通过利用铒光纤的频率响应来抑制光纤陀螺仪中的相对强度噪声的系统和方法。 在操作中，由铒光纤提供的增益被添加到反馈回路中其他部件的增益，以提供高达约250 kHz的稳定回路性能。 大约3kHz的铒光纤的频率响应也提供了6dB的每倍频程滚降，当用于控制流向陀螺仪光源的电流的负反馈控制环路中时，允许相对强度噪声控制 带宽大于3 kHz; 这可以用于高性能陀螺仪应用。

公开(公告)号：US06654126B1

公开(公告)日：2003-11-25

申请号：US09724077

申请日：2000-11-28

Applicant: Toshifumi Ohsawa

Inventor： Toshifumi Ohsawa

IPC: G01C1972

CPC classification number: H01S5/1071 ,  G01C19/66 ,  H01S5/1064

Abstract: An angular velocity detecting apparatus comprises a ring laser including a tapered light waveguide of an asymmetrical shape in at least a portion of a light waveguide so that the oscillation threshold values of laser beams propagating round in opposite directions of rotation may differ from each other, an optical gyro having a terminal for detecting any change in at least one of an electric current, a voltage and impedance in the ring laser, a measuring device for measuring the information of the cycle of the change in at least one of the electric current, the voltage and the impedance outputted from the terminal of the gyro, a clock generation device for generating a predetermined clock for sampling, and a calculation circuit for inputting the result of the measurement by the measuring device at a predetermined sampling cycle, and calculating information regarding an angular velocity on the basis of the result of the measurement. The predetermined sampling cycle generated by the clock generation device is longer than the cycle of the change in at least one of the electric current, the voltage and the impedance produced by the optical gyro within the necessary range for the detection of the angular velocity.

Abstract translation: 角速度检测装置包括环形激光器，其包括在光波导的至少一部分中的不对称形状的锥形光波导，使得在相反的旋转方向上传播的激光束的振荡阈值彼此可能不同， 具有用于检测环形激光器中的电流，电压和阻抗中的至少一个的任何变化的端子的光学陀螺仪，用于测量至少一个电流的变化周期的信息的测量装置， 电压和从陀螺仪的端子输出的阻抗，用于产生用于采样的预定时钟的时钟产生装置和用于以预定采样周期输入测量装置的测量结果的计算电路，以及计算关于 基于测量结果的角速度。 由时钟发生装置产生的预定采样周期比在用于检测角速度的必要范围内由光学陀螺仪产生的电流，电压和阻抗中的至少一个变化的周期长。

公开(公告)号：US06469792B1

公开(公告)日：2002-10-22

申请号：US09516419

申请日：2000-03-01

Applicant: Edward L. Arnn

Inventor： Edward L. Arnn

IPC: G01C1972

CPC classification number: G01C19/72

Abstract: A system and method for processing the output of a fiber-optic gyroscope. The inventive circuit (10) includes a photodetector (24) for detecting electromagnetic energy received from the fiber-optic gyroscope (18,20) and providing an analog input signal in response thereto. An analog-to-digital converter (42) is provided for processing the analog input signal and providing a digital signal in response thereto. A source (30) is provided for injecting a dither signal between the photodetector (24) and the analog-to-digital converter (42). In the illustrative embodiment, the source (30) supplies a triangle wave signal. The output of the photodetector (24) is supplied to the summing input of a differential amplifier (29) and the output of the source (30) supplies the differencing input to the differential amplifier (29). The output of the analog-to-digital converter (42) is provided to a digital signal processor (44) as per usual practice.

Abstract translation: 一种用于处理光纤陀螺仪输出的系统和方法。 本发明的电路（10）包括用于检测从光纤陀螺仪（18,20）接收的电磁能量并提供响应于此的模拟输入信号的光电检测器（24）。 提供一个模拟 - 数字转换器（42），用于处理模拟输入信号并响应于此提供一个数字信号。 源（30）被提供用于在光电检测器（24）和模 - 数转换器（42）之间注入抖动信号。 在说明性实施例中，源（30）提供三角波信号。 光电检测器（24）的输出被提供给差分放大器（29）的求和输入端，源极（30）的输出端将差分输入端提供给差分放大器（29）。 根据惯例，将模数转换器（42）的输出提供给数字信号处理器（44）。

公开(公告)号：US06259089B1

公开(公告)日：2001-07-10

申请号：US09079581

申请日：1998-05-15

Applicant: Victor Vali ,  Bruce Youmans ,  Colleen Fitzpatrick

Inventor： Victor Vali ,  Bruce Youmans ,  Colleen Fitzpatrick

IPC: G01C1972

CPC classification number: G01C19/722

Abstract: A gyroscope which utilizes light waves to sense motion in the plane of the substrate. The gyroscope has a primary optical waveguide which is adapted to pass light from a single light source through the primary optical waveguide in both directions. The light exiting from each end of the primary optical waveguide is withdrawn and passed through two dedicated waveguides (one dedicated waveguide for each end of the primary optical waveguide). Preferably, these two dedicated waveguides have differing times for light travel such that one of the dedicated waveguides emits its light one-quarter wavelength behind the other dedicated waveguide. The light being emitted from each dedicated waveguide is then combined permitting a sensor to monitor any shifts between the two light signals as a monitor to motion of the primary optical waveguide.

Abstract translation: 利用光波感测基板平面中的运动的陀螺仪。 陀螺仪具有主要光波导，其适于使来自单个光源的光沿两个方向通过主光波导。 从主光波导的每一端出射的光被取出并通过两个专用波导（一个专用波导用于主光波导的每一端）。 优选地，这两个专用波导对于光行进具有不同的时间，使得专用波导中的一个在其它专用波导之后发射其四分之一波长的光。 然后组合从每个专用波导发射的光，允许传感器监测两个光信号之间的任何偏移作为主光波导的运动的监视器。

公开(公告)号：US06836334B2

公开(公告)日：2004-12-28

申请号：US09998944

申请日：2001-10-31

Applicant: Sidney M. Bennett

Inventor： Sidney M. Bennett

IPC: G01C1972

CPC classification number: G01C19/72

Abstract: The invention comprises a system and method for reducing a shot noise component of the Angle Random Walk Noise in a fiber optic sensor by providing a first optical amplifier prior to the photodetector of the sensor to increase the power seen at the detector. An optical amplifier and second detector may be provided to detect a source sample, which can be useful in reducing RIN noise. Optical isolators may be added at the optical amplifiers to prevent rear facet emissions from the optical amplifiers from affecting sensor signals. A coupler with an isolator, amplifier and detector may be provided to receive a sample of the facet emissions from the first optical amplifier, which may be subtracted from the sensor signal at the detector so as to eliminate the facet emissions from the sensor signals. Polarizers may be provided prior to each detector to further eliminate emissions.

Abstract translation: 本发明包括一种用于通过在传感器的光电检测器之前提供第一光学放大器以增加在检测器处看到的功率来减小光纤传感器中角度随机游走噪声的散粒噪声分量的系统和方法。 可以提供光放大器和第二检测器来检测源样本，这可以用于减少RIN噪声。 可以在光放大器处添加光隔离器，以防止光放大器的后面发射影响传感器信号。 可以提供具有隔离器，放大器和检测器的耦合器以接收来自第一光放大器的小面发射的样本，其可以在检测器处从传感器信号中减去，以消除来自传感器信号的小平面发射。 可以在每个检测器之前提供偏振器以进一步消除排放。

公开(公告)号：US06611337B1

公开(公告)日：2003-08-26

申请号：US09762869

申请日：2001-03-29

Applicant: Ian Masson Bassett ,  John Herbert Haywood

Inventor： Ian Masson Bassett ,  John Herbert Haywood

IPC: G01C1972

CPC classification number: G01C19/725 ,  G01J9/02 ,  G01R15/246

Abstract: A method of interrogating an optical coupler interconnected to a two beam interferometer, so as to determine an idealized output value, said optical coupler having at least three bidirectional external input/output ports, said method comprising the steps of: for each of said external input/output ports: inserting an optical signal into the port; measuring a corresponding output at each of said ports; forming summations of those corresponding outputs which, in an ideal coupler, would have equal intensities; and determining said idealized output value of said coupler from said summations.

Abstract translation: 一种询问耦合到双光束干涉仪的光耦合器的方法，以便确定理想化的输出值，所述光耦合器具有至少三个双向外部输入/输出端口，所述方法包括以下步骤：对于每个所述外部输入 /输出端口：将光信号插入端口; 测量每个所述端口处的相应输出; 形成在理想耦合器中具有相等强度的相应输出的相加; 以及从所述求和确定所述耦合器的所述理想化输出值。

公开(公告)号：US06594020B2

公开(公告)日：2003-07-15

申请号：US09906019

申请日：2001-07-13

Applicant: Richard B. Dyott

Inventor： Richard B. Dyott

IPC: G01C1972

CPC classification number: G01C19/72 ,  G01R15/246 ,  G01R15/247

Abstract: A system and a method for controlling the scale factor of a fiber optic sensor are disclosed. The scale factor may be maintained at a constant level by controlling the power level of the light source based on the amplitude of a modulation superimposed on the modulator drive signal. Alternatively, scale factor may be maintained at a constant level by setting the detected signal at twice the modulator drive frequency to zero.

Abstract translation: 公开了一种用于控制光纤传感器的比例因子的系统和方法。 可以通过基于调制器驱动信号上叠加的调制的幅度来控制光源的功率电平，将比例因子维持在恒定水平。 或者，通过将调制器驱动频率的两倍的检测信号设置为零，可以将比例因子保持在恒定水平。

公开(公告)号：US06351310B1

公开(公告)日：2002-02-26

申请号：US09459438

申请日：2000-10-04

Applicant: Steven R. Emge ,  Sidney M. Bennett

Inventor： Steven R. Emge ,  Sidney M. Bennett

IPC: G01C1972

CPC classification number: G01C19/721

Abstract: An interferometric fiber optic gyroscope (IFOG) system includes a fiber sensing coil and a semiconductor or rare-earth doped fiber light source emitting light with an associated light source intensity. The source has a front output and back output. An optical coupler is attached to the front output for receiving said light from said light source and the coupler creates two substantially equal intensity light beams for simultaneous transmission into the sensing coil said coupler attached to the coil. The fiber sensing coil supplies return light to the coupler from said equal intensity light beams and the coupler combines and interferes the return light into a combined light beam. An optical phase modulator has a phase modulation amplitude, and the modulator coupled to the coil. An oscillator is coupled to the modulator and produces a periodic voltage which controls the phase modulation amplitude. The combined light signal is transmitted through the light source and received by the detecting means coupled to said light source at the back output. Light detection means detect and convert the combined light beam into an electrical current. An electrical amplifier is coupled to the detector for converting said current into an electrical voltage. Alternating current voltage amplitude controller means is coupled to the amplifier, and controls the associated light source intensity. Electrical signal processing means is coupled to the amplifier and processes the voltage and provides an output signal proportional to the angular rotation rate input of the sensing coil.

Abstract translation: 干涉光纤陀螺（IFOG）系统包括光纤感测线圈和发射具有相关光源强度的光的半导体或稀土掺杂光纤光源。 源有一个前置输出和反向输出。 光耦合器附接到前端输出，用于接收来自所述光源的所述光，并且耦合器产生两个基本上相等的强度光束，用于同时传输到感测线圈，所述耦合器连接到线圈。 光纤感测线圈从所述等强度的光束向耦合器提供返回光，并且耦合器将返回光组合并干扰到组合的光束中。 光相位调制器具有相位调制幅度，调制器耦合到线圈。 振荡器耦合到调制器并产生控制相位调制幅度的周期性电压。 组合的光信号通过光源传输并由在后输出处耦合到所述光源的检测装置接收。 光检测装置检测并将组合的光束转换成电流。 电放大器耦合到检测器，用于将所述电流转换成电压。 交流电压幅度控制器装置耦合到放大器，并且控制相关联的光源强度。 电信号处理装置耦合到放大器并处理电压并提供与感测线圈的角度旋转速率输入成比例的输出信号。

公开(公告)号：US06320664B1

公开(公告)日：2001-11-20

申请号：US09224612

申请日：1998-12-31

Applicant: Andrew W. Kaliszek ,  Glen A. Sanders ,  Clarence E. Laskoskie

Inventor： Andrew W. Kaliszek ,  Glen A. Sanders ,  Clarence E. Laskoskie

IPC: G01C1972

CPC classification number: G01C19/722

Abstract: A rectification error reducer for a fiber optic gyroscope, which is an intensity servo or compensator for reducing vibration effects in the optical signals caused by modulation at vibration frequencies induced by the gyroscope-operating environment. The vibration effects may be detected in signals from the photodiode output in amplitude form, which is used in a control system to null out optical intensity variations at the frequencies of vibration.

Abstract translation: 一种用于光纤陀螺仪的整流误差减小器，其是用于减少由陀螺仪操作环境引起的振动频率下的调制引起的光信号中的振动效应的强度伺服或补偿器。 可以在振幅形式的光电二极管输出的信号中检测振动效应，其用于控制​​系统以消除振动频率处的光强度变化。

公开(公告)号：US06657729B2

公开(公告)日：2003-12-02

申请号：US09814902

申请日：2001-03-22

Applicant: Pei-Hwa Lo ,  Herb Califano

Inventor： Pei-Hwa Lo ,  Herb Califano

IPC: G01C1972

CPC classification number: G01C19/721

Abstract: A system and method are provided for improving spectrum linewidth and stability while using the lasing region of a conventional laser diode light source. The inventive system and method provide a dithering signal for varying the drive current of the laser diode light source. By varying the drive current, the spectrum linewidth and stability of the conventional laser diode light source is significantly improved. Specifically, an optic fiber gyroscope can be driven by a conventional laser diode source which is powered by a dithered drive signal.

Abstract translation: 提供了一种用于在使用常规激光二极管光源的激光区域时改善光谱线宽和稳定性的系统和方法。 本发明的系统和方法提供了用于改变激光二极管光源的驱动电流的抖动信号。 通过改变驱动电流，传统激光二极管光源的光谱线宽和稳定性得到显着提高。 具体来说，光纤陀螺仪可以由传统的激光二极管源驱动，激光二极管源由抖动驱动信号供电。