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：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：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：US08098380B2

公开(公告)日：2012-01-17

申请号：US12506855

申请日：2009-07-21

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Multiple resonator fiber optic gyroscope (RFOG) configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors. The resonator comprises at least a loop fiber, either two or more in/out coupling elements, and connectors that link elements into a circulating loop. Directional elements may be used to separate output light from input light in some of the embodiments. In all embodiments, mode filters are placed in the resonator to guarantee that the light reaching the photodetector is filtered by at least one mode filter in the resonator at least once. The mode filters may contain both spatial mode filters (such as single mode fibers or waveguides) and polarization mode filters (such as polarizing elements) so that both spatial and polarization mode filtering can be implemented simultaneously.

摘要翻译： 采用在谐振器内部包括一个或多个模式滤波器的多谐振器光纤陀螺仪（RFOG）配置来有效地抑制可能是陀螺仪偏置误差的重要来源的不期望的高阶空间模式。 谐振器包括至少一个环路光纤，两个或更多个输入/输出耦合元件，以及将元件链接到循环回路中的连接器。 在一些实施例中，定向元件可用于将输出光与输入光分离。 在所有实施例中，模式滤波器被放置在谐振器中，以保证到达光电检测器的光至少一个谐振器中的至少一个模式滤波器被滤波。 模式滤波器可以包含空间模式滤波器（例如单模光纤或波导）和偏振模式滤波器（例如偏振元件），使得可以同时实现空间和偏振模式滤波。

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：US08068233B2

公开(公告)日：2011-11-29

申请号：US12466140

申请日：2009-05-14

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

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

IPC分类号： G01B9/02

CPC分类号： G01C19/727

摘要： Substantially symmetric RFOG configurations for rotation rate sensing using two input/output coupling components. Configurations are disclosed where optical coupling components handles both input and output lightwaves. Reducing the number of input/output coupling components while maintaining a substantially symmetric configuration for the CW and CCW beam reduces losses, prevents realization of bias errors due to asymmetric light paths in the resonator, and produces better signal to noise performance. In addition, the invention discloses systems integrating multiple functions into compact micro-optic devices that are easier to fabricate and package, leading to compact RFOGs with reduced cost and improved manufacturability.

摘要翻译： 使用两个输入/输出耦合组件进行旋转速率感测的基本对称RFOG配置。 公开了光耦合部件处理输入和输出光波的配置。 降低输入/输出耦合分量的数量同时保持CW和CCW波束的基本对称的结构减少了损耗，防止了由于谐振器中的不对称光路导致的偏移误差的实现，并且产生更好的信噪比性能。 此外，本发明公开了将多种功能集成到紧凑型微型光学器件中的系统，其更容易制造和封装，从而导致紧凑型RFOG，其成本降​​低且可制造性提高。

公开(公告)号：US20110019198A1

公开(公告)日：2011-01-27

申请号：US12506855

申请日：2009-07-21

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Multiple resonator fiber optic gyroscope (RFOG) configurations comprising one or more mode filters inside the resonator are adopted to effectively suppress unwanted high order spatial modes which can be a significant source of gyro bias errors. The resonator comprises at least a loop fiber, either two or more in/out coupling elements, and connectors that link elements into a circulating loop. Directional elements may be used to separate output light from input light in some of the embodiments. In all embodiments, mode filters are placed in the resonator to guarantee that the light reaching the photodetector is filtered by at least one mode filter in the resonator at least once. The mode filters may contain both spatial mode filters (such as single mode fibers or waveguides) and polarization mode filters (such as polarizing elements) so that both spatial and polarization mode filtering can be implemented simultaneously.

摘要翻译： 采用在谐振器内部包括一个或多个模式滤波器的多谐振器光纤陀螺仪（RFOG）配置来有效地抑制可能是陀螺仪偏置误差的重要来源的不期望的高阶空间模式。 谐振器包括至少一个环路光纤，两个或更多个输入/输出耦合元件，以及将元件链接到循环回路中的连接器。 在一些实施例中，定向元件可用于将输出光与输入光分离。 在所有实施例中，模式滤波器被放置在谐振器中，以保证到达光电检测器的光至少一个谐振器中的至少一个模式滤波器被滤波。 模式滤波器可以包含空间模式滤波器（例如单模光纤或波导）和偏振模式滤波器（例如偏振元件），使得可以同时实现空间和偏振模式滤波。