公开(公告)号：US08908187B2

公开(公告)日：2014-12-09

申请号：US13287422

申请日：2011-11-02

申请人： Lee K. Strandjord ,  Tiequn Qiu ,  Glen A. Sanders

发明人： Lee K. Strandjord ,  Tiequn Qiu ,  Glen A. Sanders

IPC分类号： G01C19/64 ,  G01C19/72

CPC分类号： G01C19/727 ,  G01C19/722

摘要： An exemplary resonator fiber optic gyroscope comprises a resonator having an optical fiber loop; a light source configured to generate a light beam; and an intensity modulation circuit coupled between the light source and the resonator. The intensity modulation circuit is configured to modulate the intensity of the light beam from the light source to output an intensity modulated signal to the resonator. The intensity modulation circuit is configured to produce the intensity modulated signal such that harmonics of the intensity modulated signal which overlap a primary wave of a counter-propagating light beam in the resonator have an amplitude below a predetermined threshold. Amplitudes below the predetermined threshold are negligible.

摘要翻译： 一种示例性的谐振器光纤陀螺仪包括具有光纤回路的谐振器; 被配置为产生光束的光源; 以及耦合在光源和谐振器之间的强度调制电路。 强度调制电路被配置为调制来自光源的光束的强度，以将强度调制信号输出到谐振器。 强度调制电路被配置为产生强度调制信号，使得与谐振器中的相反传播光束的主波重叠的强度调制信号的谐波具有低于预定阈值的幅度。 低于预定阈值的幅度可以忽略不计。

公开(公告)号：US07855789B2

公开(公告)日：2010-12-21

申请号：US12167056

申请日：2008-07-02

申请人： Lee K. Strandjord ,  Glen A. Sanders

发明人： Lee K. Strandjord ,  Glen A. Sanders

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Systems and methods for performing modulation error correction. An example system applies common phase/frequency modulation to first and second laser beams, a first intensity modulation to the first modulated beam, and a second intensity modulation to the second modulated beam. Signals outputted are demodulated according to the frequency of the common phase/frequency modulation. Then the first of these demodulated signals is demodulated based on the frequency of the intensity modulation of the first beam, and the second of these demodulated signals is demodulated based on the frequency of the intensity modulation of the second beam. Then, rate of rotation is determined based on demodulated signals. Frequencies of the intensity modulations are unequal and not harmonically related, and intensity modulation encodes each light beam with a unique signature.

摘要翻译： 用于执行调制误差校正的系统和方法。 示例性系统将共同相位/频率调制应用于第一和第二激光束，对第一调制光束进行第一强度调制，以及对第二调制光束进行第二强度调制。 输出的信号根据共同相位/频率调制的频率进行解调。 然后，基于第一光束的强度调制的频率对这些解调信号中的第一个进行解调，并且基于第二光束的强度调制的频率对这些解调信号中的第二个进行解调。 然后，基于解调信号确定旋转速率。 强度调制的频率是不相等的，而不是谐波相关的，强度调制对每个光束进行独特的签名编码。

公开(公告)号：US20100253948A1

公开(公告)日：2010-10-07

申请号：US12729660

申请日：2010-03-23

申请人： Lee K. Strandjord ,  Glen A. Sanders ,  Norman Gerard Tarleton

发明人： Lee K. Strandjord ,  Glen A. Sanders ,  Norman Gerard Tarleton

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Systems and methods for improved resonator fiber optic gyroscope intensity modulation control are provided. In one embodiment, a resonant fiber optic gyroscope (RFOG) having a residual intensity modulation (RIM) controller comprises: an intensity modulator optically coupled to receive a light beam from a laser source modulated at a resonance detection modulation frequency; an optical tap device optically coupled to the intensity modulator; and a feedback servo coupled to the optical tap device and the intensity modulator, the demodulating feedback servo generating a sinusoidal feedback signal to the intensity modulator. The feedback servo adjusts an amplitude and phase of the sinusoidal feedback signal provided to intensity modulator based on a residual intensity modulation detected by the demodulating feedback servo.

摘要翻译： 提供了改进谐振器光纤陀螺仪强度调制控制的系统和方法。 在一个实施例中，具有残余强度调制（RIM）控制器的谐振光纤陀螺仪（RFOG）包括：光耦合的光强调制器，用于接收来自以谐振检测调制频率调制的激光源的光束; 与所述强度调制器光耦合的光学抽头装置; 以及耦合到光学抽头装置和强度调制器的反馈伺服器，解调反馈伺服器向强度调制器产生正弦反馈信号。 基于由解调反馈伺服检测到的残余强度调制，反馈伺服调节提供给强度调制器的正弦反馈信号的幅度和相位。

公开(公告)号：US07583384B2

公开(公告)日：2009-09-01

申请号：US11495266

申请日：2006-07-27

申请人： Gregory W. Keith ,  Thomas C. Greening ,  Lee K. Strandjord

发明人： Gregory W. Keith ,  Thomas C. Greening ,  Lee K. Strandjord

IPC分类号： G01C19/72

CPC分类号： G01C19/726

摘要： Methods and system are provided for driving light through a sensing coil of an optical gyro. The system includes a photodetection circuit having an input for receiving an optical output from the sensing coil and having an output, and a signal processing circuit having an input coupled to the output of the photodetection circuit and having an output for supplying an output signal to modulate the sensing coil. The photodetection system produces a digital signal from the optical output. The signal processing circuit produces a feedback signal from the digital signal and adds a random number to the feedback signal to produce the output signal.

摘要翻译： 提供了用于通过光学陀螺仪的感测线圈驱动光的方法和系统。 该系统包括光电检测电路，其具有用于接收来自感测线圈的光输出并具有输出的输入端，以及信号处理电路，其具有耦合到光电检测电路的输出的输入端并具有用于提供输出信号以进行调制的输出 传感线圈。 光电检测系统产生来自光输出的数字信号。 信号处理电路从数字信号产生反馈信号，并向反馈信号添加随机数以产生输出信号。

公开(公告)号：US07522284B2

公开(公告)日：2009-04-21

申请号：US11540771

申请日：2006-09-29

申请人： Glen A. Sanders ,  Lee K. Strandjord ,  Tiequn Qiu

发明人： Glen A. Sanders ,  Lee K. Strandjord ,  Tiequn Qiu

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Methods and apparatus are provided for attenuating rotation rate errors in a resonator gyro. The gyro includes a ring resonator having a hollow core optical fiber coil and optical elements that are selected and/or oriented to reduce stray light that may be present in input light beams introduced to the ring resonator. The resonator has a predetermined mode. One of the optical elements partially transmits a portion of the input light beam to a first end of the fiber coil while partially transmitting a portion of the input light beam to a filter. Light having the predetermined mode is accepted into the first end of the fiber coil, and the filter accepts light of the input light beam having a corresponding mode. Transmission components of the circulating light beams indicates resonance peaks of the counter-propagating directions of the ring resonator.

摘要翻译： 提供了用于衰减谐振器陀螺仪中的转速误差的方法和装置。 陀螺仪包括具有中空纤芯光纤线圈的环形谐振器和选择和/或取向以减少可能存在于引入环形谐振器的输入光束中的杂散光的光学元件。 谐振器具有预定模式。 一个光学元件将输入光束的一部分部分地传输到光纤线圈的第一端，同时部分地将输入光束的一部分传输到滤光器。 具有预定模式的光被接受到光纤线圈的第一端，并且滤光器接受具有相应模式的输入光束的光。 循环光束的透射分量表示环形谐振器的相反传播方向的共振峰值。

公开(公告)号：US20090059237A1

公开(公告)日：2009-03-05

申请号：US11378231

申请日：2006-03-17

申请人： Lee K. Strandjord ,  David A. Doheny

发明人： Lee K. Strandjord ,  David A. Doheny

IPC分类号： G01C19/72

CPC分类号： G01C19/726

摘要： A digital feedback system and for an optical gyroscope include a fiber optic sensing coil, an optical phase modulator, a photo detector and a processor. The sensing coil induces a phase differential between light waves traveling though the coil. The optical phase modulator causes a second phase differential between the light waves. The photo detector receive the light waves and outputs an intensity signal representing a phase difference between the light waves. The processor determines a rate of rotation of the fiber optic sensing coil based on the phase difference. for the system operates by generating a closed loop feedback signal, demodulating the signal to determine the phase difference, determining a rate of rotation, periodically incrementing a feedback ramp signal once every τ second period based on the rate of rotation, and resetting the feedback ramp signal when the ramp is incremented a predetermined number of times since a previous reset.

摘要翻译： 数字反馈系统和光学陀螺仪包括光纤感测线圈，光学相位调制器，光电检测器和处理器。 感测线圈在通过线圈传播的光波之间引起相位差。 光相位调制器在光波之间引起第二相位差。 光检测器接收光波并输出表示光波之间的相位差的强度信号。 处理器基于相位差确定光纤感测线圈的旋转速率。 为了系统通过产生闭环反馈信号进行操作，解调信号以确定相位差，确定旋转速率，基于旋转速率，每τ第二周期周期性地增加反馈斜坡信号，并且重置反馈斜坡 当斜坡自上一次复位以来增加预定次数时信号。

公开(公告)号：US20080297805A1

公开(公告)日：2008-12-04

申请号：US11643435

申请日：2006-12-21

申请人： Lee K. Strandjord ,  Scott A. Anson

发明人： Lee K. Strandjord ,  Scott A. Anson

IPC分类号： G01B9/02 ,  G02B6/00 ,  G01C19/72

CPC分类号： G01C19/721

摘要： Methods and apparatus are provided for reducing output noise of optical gyros. The apparatus includes a sensing system for circulating counter-propagating light beams and producing an output light beam, a coupler having multiple ports and supplying an input light beam to the sensing system, a first detector coupled to the coupler for detecting a rotation rate based on the output light beam, a second detector coupled to the coupler for detecting noise based on the input light beam, and at least one optical device coupled to one of the ports of the coupler. The optical device is configured to reduce a spectral mismatch between the input light beam received by the second detector and the output light beam received by the first detector.

摘要翻译： 提供了减少光学陀螺仪输出噪声的方法和装置。 该装置包括用于循环反向传播光束并产生输出光束的感测系统，具有多个端口并将输入光束提供给感测系统的耦合器，耦合到耦合器的第一检测器，用于检测基于 输出光束，耦合到耦合器的第二检测器，用于基于输入光束检测噪声，以及耦合到耦合器的一个端口的至少一个光学装置。 光学装置被配置为减少由第二检测器接收的输入光束和由第一检测器接收的输出光束之间的光谱失配。

公开(公告)号：US07327460B2

公开(公告)日：2008-02-05

申请号：US11266628

申请日：2005-11-02

申请人： Glen A. Sanders ,  Lee K. Strandjord

发明人： Glen A. Sanders ,  Lee K. Strandjord

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Methods and apparatus are provided for sensing a rotation rate of a ring resonator in a transmission mode. A ring resonator for circulating light beams in counter-propagating directions comprises an optical fiber coil having a hollow core and first and second ends. A first optical element is configured to receive an input light beam and direct a portion of the input light beam in a counter-propagating direction of the ring resonator. A second optical element is configured to direct with the first optical element a majority of a circulating light beam in the counter-propagating direction of the ring resonator and derive a transmission mode component of the circulating light beam at one of the ends. The portion of the input light beam enters one of the first and second ends. The circulating light beam is based on the input light beam. The transmission mode component indicates a resonance peak of the counter-propagating direction of the ring resonator.

摘要翻译： 提供了用于在传输模式下感测环形谐振器的旋转速率的方法和装置。 用于沿反向传播方向循环光束的环形谐振器包括具有中空芯的光纤线圈和第一和第二端。 第一光学元件被配置为接收输入光束并且在环形谐振器的相反传播方向上引导输入光束的一部分。 第二光学元件被配置为使第一光学元件与环形谐振器的反向传播方向上的大部分循环光束一起引导，并且在一个端部导出循环光束的透射模式分量。 输入光束的部分进入第一和第二端之一。 循环光束基于输入光束。 传输模式分量表示环形谐振器的相反传播方向的谐振峰值。

公开(公告)号：US06778279B2

公开(公告)日：2004-08-17

申请号：US10078741

申请日：2002-02-19

申请人： Charles Lange ,  Steve Sanders ,  Dick Ang ,  Lee K. Strandjord

发明人： Charles Lange ,  Steve Sanders ,  Dick Ang ,  Lee K. Strandjord

IPC分类号： G01B902

CPC分类号： G01C19/64 ,  G01B11/16 ,  G01C19/72 ,  G01D5/268 ,  G01N21/431 ,  G01S7/4811 ,  G01S7/4818 ,  G01S17/36 ,  G01S17/88

摘要： A method is provided for sensing an environmental effect upon a sensing element and includes exposing the sensing element into the environmental effect, producing a light signal in the sensing element, modulating the light signal with a modulation signal, and determining a path length of the light signal as a function of the modulation signal. A fiber optic sensor is provided that includes a light source producing a light, a sensing element optically coupled to the light source such that the light propagates through the sensing element, a detector optically coupled to the sensing element. The detector detects light intensity propagating in the sensing element. An electronics processor receives the detector output and produces a modulation signal for the light. The processor further produces an output signal indicative of the environmental effect as a function of the modulation signal.

摘要翻译： 提供了一种用于感测对感测元件的环境影响的方法，并且包括将感测元件暴露于环境效应中，在感测元件中产生光信号，用调制信号调制光信号，以及确定光的路径长度 信号作为调制信号的函数。 提供了一种光纤传感器，其包括产生光的光源，光学耦合到光源的感测元件，使得光通过感测元件传播，光学耦合到感测元件的检测器。 检测器检测在感测元件中传播的光强度。 电子处理器接收检测器输出并产生光的调制信号。 处理器进一步产生指示作为调制信号的函数的环境影响的输出信号。

公开(公告)号：US09207082B2

公开(公告)日：2015-12-08

申请号：US13586055

申请日：2012-08-15

申请人： Tiequn Qiu ,  Glen A. Sanders ,  Lee K. Strandjord

发明人： Tiequn Qiu ,  Glen A. Sanders ,  Lee K. Strandjord

IPC分类号： G01C19/72

CPC分类号： G01C19/727 ,  G01C19/72 ,  G01C19/721

摘要： One embodiment is directed to a resonator fiber optic gyroscope (RFOG). The optical fiber resonator includes an optical fiber, one or more optical filters that suppresses the noise light in the resonator, one or more variable optical attenuators (VOAs) that can adjust the loss of the resonator with fast response, and one or more optical gain elements that provide amplification of light to offset part of the losses of the resonator. The RFOG also includes one or more pump lasers to produce one or more pump beams for the gain elements in the resonator and control electronics configured to control the one or more pump lasers and the one or more variable optical attenuators, such that the round-trip loss of the resonator is a substantially constant, positive value.

摘要翻译： 一个实施例涉及一种谐振器光纤陀螺仪（RFOG）。 光纤谐振器包括光纤，抑制谐振器中的噪声光的一个或多个滤光器，可以快速响应地调节谐振器损耗的一个或多个可变光衰减器（VOA）以及一个或多个光增益 提供光的放大以偏移谐振器的损耗的一部分的元件。 RFOG还包括一个或多个泵浦激光器以产生用于谐振器中的增益元件的一个或多个泵浦光束，以及被配置为控制一个或多个泵激光器和一个或多个可变光衰减器的控制电子设备，使得往返 谐振器的损耗是基本恒定的正值。