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：US07844152B2

公开(公告)日：2010-11-30

申请号：US12167219

申请日：2008-07-02

申请人： Glen A. Sanders

发明人： Glen A. Sanders

IPC分类号： G02B6/00 ,  H01S3/08 ,  G02F1/01 ,  G01C19/64

CPC分类号： G01C19/727 ,  G02F1/3544 ,  G02F1/37 ,  G02F2203/15

摘要： Systems and methods for compensating for nonlinear phase shift accumulation in an optical ring resonator. An example method includes sending a first beam in a clockwise direction around the optical ring resonator and sending a second beam in a counterclockwise direction around the optical ring resonator. Then, nonlinear phase shift accumulation of the first and second beams is compensated for within the optical ring resonator. Compensating includes creating a negative Kerr effect phase shift for each beam based on an estimate of accumulated positive Kerr effect.

摘要翻译： 用于补偿光环谐振器中的非线性相移累积的系统和方法。 示例性方法包括围绕光环谐振器沿顺时针方向发送第一光束，并沿光环谐振器周围的逆时针方向发送第二光束。 然后，在光环谐振器内补偿第一和第二波束的非线性相移累积。 补偿包括基于积累的正克尔效应的估计为每个波束产生负的克尔效应相移。

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：US20100033729A1

公开(公告)日：2010-02-11

申请号：US12187932

申请日：2008-08-07

申请人： Tiequn Qiu ,  Steven J. Sanders ,  Sorin Mosor ,  Glen A. Sanders

发明人： Tiequn Qiu ,  Steven J. Sanders ,  Sorin Mosor ,  Glen A. Sanders

IPC分类号： G01C19/72 ,  G06G7/48

CPC分类号： G01C19/64

摘要： A computer-implementable method of reducing bias instability in a fiber optic gyroscope includes receiving, with a computer, a first data set enabling the computer to generate a model of the gyroscope, including a light source, a photodetector, and a plurality of optical components and fiber sections coupling the light source to the photodetector, and a light signal to be propagated from the light source to the photodetector. The light signal has an associated wavelength spectrum. For each wavelength of the spectrum, the relative lightwave intensity reaching the photodetector is calculated. A signal-wave intensity and a spurious-wave intensity are determined from the calculated relative lightwave intensities. A scale factor is determined from the signal-wave intensity. The spurious-wave intensity is integrated over the wavelength spectrum of the light source to obtain a total spurious-wave intensity. A rate bias error is determined based on the total spurious-wave intensity and the scale factor.

摘要翻译： 一种降低光纤陀螺仪中的偏压不稳定性的计算机可实现的方法包括：利用计算机接收第一数据组，使得该计算机能够生成陀螺仪的模型，该模型包括光源，光电检测器和多个光学部件 以及将光源耦合到光电检测器的光纤部分，以及从光源传播到光电检测器的光信号。 光信号具有相关的波长谱。 对于光谱的每个波长，计算到达光电检测器的相对光波强度。 从计算的相对光波强度确定信号波强度和寄生波强度。 从信号波强度确定比例因子。 寄生波强度集成在光源的波长光谱上，以获得总的杂散波强度。 基于总杂散波强度和比例因子确定速率偏差误差。

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：US20090067775A1

公开(公告)日：2009-03-12

申请号：US11757904

申请日：2007-06-04

申请人： Glen A. Sanders

发明人： Glen A. Sanders

IPC分类号： G02B6/00

CPC分类号： G01N21/7746 ,  G01N2021/7716 ,  G01N2021/7776 ,  G02B6/02009 ,  G02B6/02304 ,  G02B6/02333 ,  G02B6/024 ,  G02B6/4228

摘要： Optical systems for sensing chemicals. An example system includes a light source, a light sensor, a processing device in signal communication with the light source and the light sensor, and a fiber optic cable that receives light from the light source and delivers light to the light sensor. The fiber optic cable includes a cladding material that is permeable to a predefined substance and an optical fiber core surrounded by the cladding material. The optical fiber core is a single mode optical fiber having a diameter greater than 30 μm. The optical fiber core includes a hollow center having a diameter between 1-50 μm. The optical fiber core includes a plurality of lengthwise holes positioned to provide single mode light propagation properties. The plurality of lengthwise holes have a diameter between 0.2-4 μm.

摘要翻译： 用于感应化学品的光学系统。 示例性系统包括光源，光传感器，与光源和光传感器信号通信的处理设备，以及光纤电缆，其从光源接收光并将光传送到光传感器。 光纤电缆包括对预定物质是可渗透的包层材料以及由包层材料包围的光纤芯。 光纤芯是直径大于30μm的单模光纤。 光纤芯包括直径在1-50μm之间的中空中心。 光纤芯包括多个纵向孔，其定位成提供单模光传播特性。 多个纵向孔的直径在0.2-4μm之间。

公开(公告)号：US20080159684A1

公开(公告)日：2008-07-03

申请号：US11647654

申请日：2006-12-29

申请人： Glen A. Sanders ,  Steve J. Sanders

发明人： Glen A. Sanders ,  Steve J. Sanders

IPC分类号： G01R33/032

CPC分类号： G01R15/246

摘要： An apparatus for sensing current and a method for sensing current are provided. The apparatus includes an optical fiber having first and second opposing ends and a hollow passageway therethrough, a recirculator configured such that when light propagates from the respective first and second ends of the optical fiber, at least some of the light is reflected by the recirculator into the respective opposing ends of the optical fiber to propagate through the optical fiber and form an optical loop having an opening therethrough, and a Faraday sensitive material positioned in the optical loop such that the light passes therethrough, an index of refraction of the Faraday sensitive material changes when a current flows through the opening of the optical loop.

摘要翻译： 提供一种用于感测电流的装置和用于感测电流的方法。 该设备包括具有第一和第二相对端和穿过其中的中空通道的光纤，再循环器构造成使得当光从光纤的相应的第一和第二端传播时，至少一些光被再循环器反射成 光纤的相对端部通过光纤传播并形成具有开口的光学环路，以及位于光学环路中的法拉第敏感材料，使得光通过其中，法拉第敏感材料的折射率 当电流流过光环路的开口时发生变化。

公开(公告)号：US07336859B2

公开(公告)日：2008-02-26

申请号：US11321158

申请日：2005-12-28

申请人： Glen A. Sanders

发明人： Glen A. Sanders

IPC分类号： G02B6/00 ,  G02B6/02

CPC分类号： G01N21/552 ,  G01N21/7703 ,  G01N21/7746 ,  G01N21/94 ,  G01N2021/7783 ,  G01N2201/0873 ,  G01N2201/088 ,  G02B6/107

摘要： Methods and apparatus are provided for detecting one or more contaminant particles in an environment with an optical sensor. The sensor includes at least one optical waveguide in a resonant arrangement and a light source positioned in an environment in which the presence of a contaminant particle is sought to be determined. The at least one optical waveguide is of a diameter that an evanescent tail of the lightwave extending there through extends into the environment and is reactive to at least one contaminant particle in the surrounding environment. A detector is positioned to receive light indicative of the sharpness of the optical resonance lineshape of the optical resonator at a pre-selected optical wavelength. The detected information determines the specific contaminant particle in the environment and the concentration of the contaminant particle in the environment.

摘要翻译： 提供了用于利用光学传感器检测环境中的一种或多种污染物颗粒的方法和装置。 传感器包括至少一个谐振装置中的光波导和位于其中寻求确定污染物颗粒的存在的环境中的光源。 至少一个光波导具有直径延伸到其中的光波的渐逝尾部延伸到环境中并且对周围环境中的至少一种污染物质具有反应性的直径。 检测器被定位成以预选的光波长接收指示光学谐振器的光学谐振线形状的清晰度的光。 检测到的信息确定环境中的特定污染物颗粒和环境中污染物颗粒的浓度。

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。