公开(公告)号：US08259301B2

公开(公告)日：2012-09-04

申请号：US12565510

申请日：2009-09-23

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： Systems and methods for reducing rotation sensing errors in a resonator fiber optic gyroscope. An example method propagates a primary light wave through a resonator having an optical fiber and a plurality of optical surfaces for directing the light wave exiting a first end of the optical fiber back into an opposite end of the optical fiber. The optical fiber is wound onto a piezo-electric transducer (PZT) tube. A sinusoidal voltage is applied to the PZT tube to modulate a length of a fiber cavity within the optical fiber. The amplitude and frequency of the fiber cavity length modulation is selected to produce a relative phase modulation between the primary light wave and a double-back reflected light wave, such that the rotation sensing errors resulting from double backscatter of light is at a frequency above a frequency band of interest. This allows the associated error to be filtered out of the rotation rate signal.

摘要翻译： 用于减少谐振器光纤陀螺仪中的旋转感测误差的系统和方法。 一个示例性方法通过具有光纤和多个光学表面的谐振器传播初级光波，用于将从光纤的第一端离开的光波引导回光纤的相对端。 将光纤缠绕在压电换能器（PZT）管上。 将正弦电压施加到PZT管以调制光纤内的纤维腔的长度。 选择光纤腔长度调制的幅度和频率以在初级光波和双反射反射光波之间产生相对相位调制，使得由双向后向散射引起的旋转感测误差处于高于 感兴趣的频段。 这允许将相关联的错误从旋转速率信号中滤除。

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：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。

公开(公告)号：US08446589B2

公开(公告)日：2013-05-21

申请号：US12581715

申请日：2009-10-19

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Systems and methods for reducing intensity modulation-induced rotation rate measurement error in a resonator optical gyroscope. The method includes tapping an intensity modulated light beam, directing a portion of the tapped light beam toward a photo detector, outputting from the photo detector a signal proportional to the amplitude variation of the light beam, amplifying the signal, and then providing the signal to the intensity modulator as a control input. Intensity modulation-induced error is reduced by an amount proportional to the gain of the feedback loop.

摘要翻译： 用于减小谐振器光学陀螺仪中强度调制诱发的旋转速率测量误差的系统和方法。 该方法包括敲击强度调制光束，将一部分抽头光束导向光电检测器，从光电检测器输出与光束的幅度变化成比例的信号，放大信号，然后将信号提供给 强度调制器作为控制输入。 强度调制诱发误差减小与反馈回路增益成比例的量。

公开(公告)号：US08085407B2

公开(公告)日：2011-12-27

申请号：US12540175

申请日：2009-08-12

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： Systems and methods for optimizing input beam modulation for high gyro sensitivity and low bias errors. The present invention is a resonator optical gyroscope having an optimized phase-modulation amplitude (frequency) for a selected modulation frequency (amplitude) that maximizes the gyro signal-to-noise (S/N) sensitivity. For selected values of the phase modulation amplitude, the polarization cross-coupling induced intensity modulation can be nulled. By setting the phase modulation amplitudes substantially close to these nulling points (e.g. M=3.832 or 7.016 radians, which causes the first order Bessel function to be zero J1(M)=0) and then optimizing the modulation frequency, the intensity modulation induced bias is reduced to zero and gyro S/N sensitivity is maximized.

摘要翻译： 用于优化输入光束调制以实现高陀螺仪灵敏度和低偏差误差的系统和方法。 本发明是一种谐振器光学陀螺仪，其对于使陀螺仪信噪比（S / N）灵敏度最大化的所选择的调制频率（幅度）具有优化的相位调制幅度（频率）。 对于相位调制幅度的选定值，偏振交叉耦合感应强度调制可以被置零。 通过将相位调制幅度设置为基本接近于这些零点（例如M = 3.832或7.016弧度，这导致一阶贝塞尔函数为零J1（M）= 0），然后优化调制频率，强度调制诱发偏差 减小到零，并且陀螺仪S / N灵敏度最大化。

公开(公告)号：US20100128277A1

公开(公告)日：2010-05-27

申请号：US12323264

申请日：2008-11-25

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

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

IPC分类号： G01C19/64

CPC分类号： G01C19/727

摘要： Hollow core fiber RFOG having symmetric M-(or W-)shape, three-(or two-)mirror configurations. These symmetric configurations help to cancel out polarization error induced bias of the RFOG even when light of the unwanted ESOP is present. The RFOG resonator with optical components forming substantially small cross-coupling angles between their polarization axes, and/or with polarizing elements inserted into the resonator, and/or with resonator mirrors having identical reflectivity for light of different polarization states, can effectively reduce the polarization mode induced bias error.

摘要翻译： 具有对称M-（或W-）形状，三（或两个）镜像配置的空心纤芯RFOG。 这些对称配置有助于消除RFOG的极化误差诱发偏置，即使存在不需要的ESOP的光。 具有在其偏振轴之间形成实质上小的交叉耦合角的RFOG谐振器和/或插入谐振器中的偏振元件和/或具有对于不同偏振态的光具有相同反射率的谐振器镜的RFOG谐振器可以有效地降低极化 模式诱发偏差误差。

公开(公告)号：US20110037985A1

公开(公告)日：2011-02-17

申请号：US12540175

申请日：2009-08-12

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： Systems and methods for optimizing input beam modulation for high gyro sensitivity and low bias errors. The present invention is a resonator optical gyroscope having an optimized phase-modulation amplitude (frequency) for a selected modulation frequency (amplitude) that maximizes the gyro signal-to-noise (S/N) sensitivity. For selected values of the phase modulation amplitude, the polarization cross-coupling induced intensity modulation can be nulled. By setting the phase modulation amplitudes substantially close to these nulling points (e.g. M=3.832 or 7.016 radians, which causes the first order Bessel function to be zero J1(M)=0) and then optimizing the modulation frequency, the intensity modulation induced bias is reduced to zero and gyro S/N sensitivity is maximized.

摘要翻译： 用于优化输入光束调制以实现高陀螺仪灵敏度和低偏差误差的系统和方法。 本发明是一种谐振器光学陀螺仪，其对于使陀螺仪信噪比（S / N）灵敏度最大化的所选择的调制频率（幅度）具有优化的相位调制幅度（频率）。 对于相位调制幅度的选定值，偏振交叉耦合感应强度调制可以被置零。 通过将相位调制幅度设置为基本接近于这些零点（例如M = 3.832或7.016弧度，这导致一阶贝塞尔函数为零J1（M）= 0），然后优化调制频率，强度调制诱发偏差 减小到零，并且陀螺仪S / N灵敏度最大化。

公开(公告)号：US07889350B2

公开(公告)日：2011-02-15

申请号：US12323264

申请日：2008-11-25

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

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

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： Hollow core fiber RFOG having symmetric M-(or W-)shape, three-(or two-)mirror configurations. These symmetric configurations help to cancel out polarization error induced bias of the RFOG even when light of the unwanted ESOP is present. The RFOG resonator with optical components forming substantially small cross-coupling angles between their polarization axes, and/or with polarizing elements inserted into the resonator, and/or with resonator mirrors having identical reflectivity for light of different polarization states, can effectively reduce the polarization mode induced bias error.

摘要翻译： 具有对称M-（或W-）形状，三（或两个）镜像配置的空心纤芯RFOG。 这些对称配置有助于消除RFOG的极化误差诱发偏置，即使存在不需要的ESOP的光。 具有在其偏振轴之间形成实质上小的交叉耦合角的RFOG谐振器和/或插入谐振器中的偏振元件和/或具有对于不同偏振态的光具有相同反射率的谐振器镜的RFOG谐振器可以有效地降低极化 模式诱发偏差误差。

公开(公告)号：US20100290057A1

公开(公告)日：2010-11-18

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： G01C19/72

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。