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：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：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：US08923352B2

公开(公告)日：2014-12-30

申请号：US13571887

申请日：2012-08-10

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： H01S3/13

CPC分类号： H01S3/1305 ,  G01C19/727 ,  H01S3/005 ,  H01S3/0085 ,  H01S3/10092 ,  H01S3/1303 ,  H01S3/1304 ,  H01S3/1307 ,  H01S3/2383 ,  H01S2301/02

摘要： One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.

摘要翻译： 一个实施例涉及包括激光器的稳定激光器，以产生频率耦合的激光器和耦合到激光器的谐振器，使得来自激光器的光线通过其中循环。 激光器还包括Pound-Drever-Hall（PDH）反馈电子器件，其被配置为调节来自激光器的光的频率，以响应于在谐振器的反射端口处感测到的光而减少相位噪声，并且配置为调整 响应于在谐振器的传输端口处感测到的光，从激光器到发射端口的谐振器的谐振的频率，其中传输端口反馈电子器件以比PDH慢至少十倍的速率调节频率 反馈电子。

公开(公告)号：US08446590B2

公开(公告)日：2013-05-21

申请号：US13150990

申请日：2011-06-01

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727 ,  G02B6/29359

摘要： An optical-fiber filter is provided. The optical-fiber filter includes an optical fiber having a first end-face and an opposing second end-face. The first end-face and the second end-face set a fiber length. The first end-face and the second end-face are coated with reflective coatings. When an optical beam emitted from a laser is coupled into one of the first end-face or the second end-face, an optical beam output from the opposing end-face has a narrow linewidth and low frequency noise fluctuations.

摘要翻译： 提供光纤滤波器。 光纤滤波器包括具有第一端面和相对的第二端面的光纤。 第一端面和第二端面设置光纤长度。 第一端面和第二端面涂有反射涂层。 当从激光器发射的光束被耦合到第一端面或第二端面中的一个时，从相对端面输出的光束具有窄线宽和低频噪声波动。

公开(公告)号：US20120307253A1

公开(公告)日：2012-12-06

申请号：US13150990

申请日：2011-06-01

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

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

IPC分类号： G01C19/72 ,  G02B6/26

CPC分类号： G01C19/727 ,  G02B6/29359

摘要： An optical-fiber filter is provided. The optical-fiber filter includes an optical fiber having a first end-face and an opposing second end-face. The first end-face and the second end-face set a fiber length. The first end-face and the second end-face are coated with reflective coatings. When an optical beam emitted from a laser is coupled into one of the first end-face or the second end-face, an optical beam output from the opposing end-face has a narrow linewidth and low frequency noise fluctuations.

摘要翻译： 提供光纤滤波器。 光纤滤波器包括具有第一端面和相对的第二端面的光纤。 第一端面和第二端面设置光纤长度。 第一端面和第二端面涂有反射涂层。 当从激光器发射的光束被耦合到第一端面或第二端面中的一个时，从相对端面输出的光束具有窄线宽和低频噪声波动。

公开(公告)号：US20110292396A1

公开(公告)日：2011-12-01

申请号：US12789972

申请日：2010-05-28

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： A resonator fiber optic gyroscope includes a sensing resonator having a first resonance frequency for a first laser beam propagation direction and a second resonance frequency for a second laser beam propagation direction; an intensity modulator coupled to an output of the sensing resonator and configured to modulate the intensity of a signal output from the sensing resonator, wherein the intensity modulator modulates the output signal at an intensity modulation frequency; and resonance tracking electronics coupled to an output of the intensity modulator and configured to demodulate the intensity modulated signal output from the intensity modulator at a resonance tracking modulation frequency to produce a first demodulated signal; the resonance tracking electronics further configured to demodulate the first demodulated signal at the intensity modulation frequency, wherein the intensity modulation frequency is different from the resonance tracking modulation frequency.

摘要翻译： 谐振器光纤陀螺仪包括：感测谐振器，具有用于第一激光束传播方向的第一谐振频率和用于第二激光束传播方向的第二谐振频率; 耦合到感测谐振器的输出并被配置为调制从感测谐振器输出的信号的强度的强度调制器，其中强度调制器以强度调制频率调制输出信号; 以及谐振跟踪电子器件耦合到所述强度调制器的输出并且被配置为以谐振跟踪调制频率解调从所述强度调制器输出的强度调制信号，以产生第一解调信号; 谐振跟踪电子器件还被配置为以强度调制频率解调第一解调信号，其中强度调制频率不同于谐振跟踪调制频率。

公开(公告)号：US07463360B2

公开(公告)日：2008-12-09

申请号：US11406939

申请日：2006-04-18

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

发明人： Grenville Hughes ,  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 determining the rotational rate of an optical gyro. An optical gyro comprises at least one substrate, a multi-frequency light source (MFLS) mounted on the substrate, and a resonator coupled to the MFLS. The MFLS is configured to produce a first light beam having a first frequency and a second light beam having a second frequency and phase locked with the first light beam. The resonator comprises an optical fiber coil having a hollow core. The resonator is configured to circulate a portion of each of the first and second light beams through the hollow core. The portion of the first light beam propagates in a first counter-propagating direction, and the portion of the second light beam propagates in a second counter-propagating direction. A measured difference between the first and second frequencies indicates a frequency shift proportional to the rotation rate of the optical gyro.

摘要翻译： 提供了用于确定光学陀螺仪的旋转速率的方法和装置。 光学陀螺仪包括至少一个衬底，安装在衬底上的多频光源（MFLS）和耦合到MFLS的谐振器。 MFLS被配置为产生具有第一频率的第一光束和具有第二频率并与第一光束锁相的第二光束。 谐振器包括具有中空芯的光纤线圈。 谐振器被配置为使第一和第二光束中的每一个的一部分循环通过中空芯。 第一光束的部分以第一反向传播方向传播，并且第二光束的部分在第二反向传播方向上传播。 第一和第二频率之间的测量差表示与光学陀螺仪的旋转速率成比例的频移。