公开(公告)号：US20160047655A1

公开(公告)日：2016-02-18

申请号：US14461680

申请日：2014-08-18

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Tiequn Qiu ,  Glen A. Sanders ,  Lee K. Strandjord

IPC: G01C19/72 ,  G02B6/28

CPC classification number: G01C19/727 ,  G01C19/72 ,  G01C19/721 ,  G02B6/2843

Abstract: Systems and methods for a resonant fiber optic gyroscope with a polarizing crystal waveguide coupler are provided. In one embodiment, an optical fiber resonator comprises: a polarizing single crystal material having a first crystal lattice axis; a first waveguide formed in the crystal material; a second waveguide formed in the crystal material running parallel to the first waveguide; and an optical fiber sensing coil. The first waveguide comprises a bend that approaches the second waveguide defining a coupling region between the first and second waveguides. The first and second waveguides are polarized to guide light having a polarization state aligned to the first crystal lattice axis. The second waveguide and the sensing coil are coupled into a resonator configuration forming a ring resonator, the second waveguide comprising a first port coupled to a first end of the coil, and a second port coupled to a second end of the coil.

Abstract translation: 提供了一种具有偏振晶体波导耦合器的谐振光纤陀螺仪的系统和方法。 在一个实施例中，光纤谐振器包括：具有第一晶格轴的偏振单晶材料; 在晶体材料中形成的第一波导; 形成在与第一波导平行的晶体材料中的第二波导; 和光纤感测线圈。 第一波导包括接近限定第一和第二波导之间的耦合区域的第二波导的弯曲部。 第一和第二波导被极化以引导具有与第一晶格轴对准的偏振状态的光。 第二波导和感测线圈耦合到形成环形谐振器的谐振器配置中，第二波导包括耦合到线圈的第一端的第一端口和耦合到线圈的第二端的第二端口。

公开(公告)号：US20160003619A1

公开(公告)日：2016-01-07

申请号：US14325006

申请日：2014-07-07

Applicant: Honeywell International Inc.

Inventor： Lee K. Strandjord ,  Glen A. Sanders ,  Jianfeng Wu

IPC: G01C19/72

CPC classification number: G01C19/727 ,  G01C19/721

Abstract: A resonator fiber optic gyroscope comprises a master laser device that emits a reference optical signal, a first slave laser device that emits a clockwise optical signal, and a second slave laser device that emits a counter-clockwise optical signal. A resonator ring cavity is in communication with the master laser device and the slave laser devices. A sine wave generator is coupled to the resonator ring cavity and outputs a common cavity modulation frequency comprising in-phase and quadrature signals. A laser stabilization servo receives a clockwise reflection signal that includes the common cavity modulation frequency from the resonator ring cavity. A modulation stripper coupled to the servo receives the in-phase and quadrature signals, receives a net error signal from the servo, demodulates the net error signal at the common cavity modulation frequency, and transmits a stripper signal to the servo to remove the signal at the common cavity modulation frequency.

Abstract translation: 谐振器光纤陀螺仪包括发射参考光信号的主激光装置，发射顺时针光信号的第一从激光装置和发射逆时针光信号的第二从激光装置。 谐振腔环与主激光器件和从属激光器件通信。 正弦波发生器耦合到谐振器环腔并输出包括同相和正交信号的公共调制频率。 激光稳定伺服机构接收包括来自谐振腔环的公共腔调制频率的顺时针反射信号。 耦合到伺服器的调制剥离器接收同相和正交信号，从伺服器接收净误差信号，解调公共空腔调制频率处的净误差信号，并将去耦信号发送到伺服器以去除信号 共腔调制频率。

公开(公告)号：US09097526B1

公开(公告)日：2015-08-04

申请号：US14158641

申请日：2014-01-17

Applicant: Honeywell International Inc.

Inventor： Glen A. Sanders ,  Lee K. Strandjord ,  Tiequn Qiu ,  Jianfeng Wu

IPC: G01C19/72 ,  G02F1/225 ,  G02F2/00

CPC classification number: G01C19/722 ,  G01C19/721 ,  G02F1/2252 ,  G02F2/00

Abstract: Systems and methods for a polarization matched resonator fiber optic gyroscope are provided. In one embodiment an RFOG comprises: a light source; a fiber optic ring resonator; a photodetector that outputs an electrical signal that varies as a function of optical intensity; and an input light polarization servo. A light beam from the servo is launched into the resonator ring in a first direction of circulation. The input polarization servo comprises a birefringence modulator that modulates a phase shift between two components of an input polarization state of the light beam at ωm, the modulator is controlled to drive towards zero a 1st harmonic of ωm as measured in the electrical signal. The servo further comprises a tunable ½ waveplate that adjusts an amplitude of the two components of the input polarization state relative to each other. The tunable ½ waveplate is controlled to maximize a peak optical intensity as measured in the electrical signal.

Abstract translation: 提供了一种用于偏振匹配谐振器光纤陀螺仪的系统和方法。 在一个实施例中，RFOG包括：光源; 光纤环谐振器; 输出根据光强度变化的电信号的光电检测器; 和输入光偏振伺服。 来自伺服器的光束沿着第一循环方向发射到谐振器环中。 输入偏振伺服包括双折射调制器，其在ωm处调制光束的输入偏振状态的两个分量之间的相移，调制器被控制为在电信号中测得的ωm的第一谐波为零。 伺服还包括可调谐的1/2波片，其调节输入偏振状态的两个分量相对于彼此的振幅。 可调谐的1/2波片被控制以使在电信号中测得的峰值光强度最大化。

公开(公告)号：US20150098088A1

公开(公告)日：2015-04-09

申请号：US14047855

申请日：2013-10-07

Applicant: Honeywell International Inc.

Inventor： Tiequn Qiu ,  Jianfeng Wu ,  Lee K. Strandjord ,  Glen A. Sanders

IPC: G01C19/66

CPC classification number: G01C19/661 ,  G01C19/727

Abstract: A resonator fiber optic gyroscope is provided. The resonator fiber optic gyroscope includes a gyroscope resonator, a laser; a clockwise modulator; a clockwise circulator; a clockwise reflection detector; a first-lock-in-amplifier, a clockwise-resonance-tracking servo to receive output from the first-lock-in-amplifier and to provide feedback to the laser to lock the laser to the gyroscope resonator; a clockwise transmission detector to detect an optical beam output from the counter-clockwise input port; a second servo; a second-lock-in-amplifier; and a third-lock-in-amplifier. The first and second lock-in-amplifiers demodulate at the first harmonic of the modulation frequency. The second-lock-in-amplifier demodulates at the second harmonic of the modulation frequency. Either the modulation frequency of the clockwise optical beam is locked to (n+0.5) times the FSR through the second servo, where n is zero or a positive integer, or the FSR is locked to 1/(n+0.5) times the modulation frequency of the clockwise optical beam through the second servo.

Abstract translation: 提供了一种谐振器光纤陀螺仪。 谐振器光纤陀螺仪包括陀螺仪谐振器，激光器; 顺时针调制器 顺时针循环器 顺时针反射检测器; 第一锁定放大器，顺时针谐振跟踪伺服器，用于接收来自第一锁定放大器的输出，并向激光器提供反馈以将激光器锁定到陀螺仪谐振器; 用于检测从逆时针输入端口输出的光束的顺时针传输检测器; 第二伺服; 第二锁定放大器; 和第三锁定放大器。 第一和第二锁相放大器在调制频率的一次谐波处解调。 第二锁定放大器在调制频率的二次谐波处解调。 顺时针光束的调制频率通过第二伺服锁定到FSR的（n + 0.5）倍，其中n为零或正整数，或者FSR被锁定到调制的1 /（n + 0.5）倍 顺时针光束通过第二伺服的频率。

公开(公告)号：US20150015892A1

公开(公告)日：2015-01-15

申请号：US13937956

申请日：2013-07-09

Applicant: Honeywell International Inc.

Inventor： Tiequn Qiu ,  Glen A. Sanders ,  Lee K. Strandjord

IPC: G01C19/72

CPC classification number: G01C19/727 ,  G01C19/72 ,  G02B6/02233 ,  G02B6/29376

Abstract: One embodiment is directed towards a resonator fiber optic gyroscope (RFOG) including a resonator, one or more light sources coupled to the resonator, and resonance tracking electronics coupled to the resonator. The one or more light sources are configured to produce at least two light beams for input into the fiber coil, the at least two light beams including a first light beam at a first frequency and a second light beam at a second frequency, the first and second frequencies locked to nearby resonance modes of the resonator. The resonance tracking electronics are configured to process output light from the resonator and generate a signal therefrom, the signal indicative of a rotation rate of the resonator. The fiber coil has approximately zero total accumulated chromatic dispersion at the first frequency and the second frequency of the first light beam and the second light beam.

Abstract translation: 一个实施例涉及包括谐振器，耦合到谐振器的一个或多个光源以及耦合到谐振器的谐振跟踪电路的谐振器光纤陀螺仪（RFOG）。 一个或多个光源被配置为产生用于输入到光纤线圈中的至少两个光束，所述至少两个光束包括第一频率的第一光束和第二频率的第二光束，第一和第二光束 第二频率被锁定到谐振器的附近谐振模式。 共振跟踪电子设备被配置为处理来自谐振器的输出光并从其产生信号，该信号指示谐振器的转速。 光纤线圈在第一频率和第一光束和第二光束的第二频率处具有近似零的总累积色散。

公开(公告)号：US11624614B1

公开(公告)日：2023-04-11

申请号：US16984855

申请日：2020-08-04

Applicant: Honeywell International Inc.

Inventor： Lee K. Strandjord ,  Tiequn Qiu ,  Glen A. Sanders

IPC: G01C19/72 ,  G01C19/66

Abstract: Systems and methods for reducing rotation sensing errors from laser source signal and modulation cross-talk are provided herein. An RFOG includes a fiber optic resonator; a first laser source that produces a first light wave at a first carrier frequency and a first cross-talked portion at a second carrier frequency wave for propagating in a first direction, wherein a second cross-talked portion propagates in a second direction that is opposite to the first direction; a second laser source that produces a second light wave for propagating in the second direction at a second carrier frequency, and having a third cross-talked portion that propagates in the first direction, a first modulator that modulates the first light wave by suppressing light at the first carrier frequency and the second cross-talked portion at the second carrier frequency, and photodetectors that generate signals from the modulated first light wave and the second light wave.

公开(公告)号：US20220128362A1

公开(公告)日：2022-04-28

申请号：US17077192

申请日：2020-10-22

Applicant: Honeywell International Inc.

Inventor： Neil A. Krueger ,  Glen A. Sanders ,  Lee K. Strandjord ,  Marc Smiciklas

IPC: G01C19/72 ,  G01C19/66

Abstract: Improvements to optical power regulation in a gyroscopic system are described. The system can include an optical assembly (e.g., optical bench) which couples opposing optical signals to a resonator coil. The system can monitor the power of the optical signals through the resonator coil by including signal extraction optics in the optical assembly which are configured to extract a portion of the optical signals. The portions can be extracted via a single beamsplitter, wherein the beamsplitter reflects the portions at a single common surface, and can also reflect the portions to a respective photodetector in free space free from intervening optical components, such as polarizers or beamplitters. One or more processors can be coupled to the optical assembly, wherein the processor(s) are configured to adjust the power of the optical signals in response to detecting a power difference between the optical signals.

公开(公告)号：US11204246B1

公开(公告)日：2021-12-21

申请号：US16900419

申请日：2020-06-12

Applicant: Honeywell International Inc.

Inventor： Lee K. Strandjord ,  Norman Gerard Tarleton ,  Chuck Croker

IPC: G01C19/72

Abstract: Systems and methods are provided to reduce at least one differential harmonics of a resonance tracking modulation in a resonant fiber optic gyroscope (RFOG). The fundamental frequency of the resonance tracking modulation of each of the clockwise and counter clockwise optical signals is substantially identical; however, the amplitude and phase of the Nth harmonic of a clockwise (CW) resonance tracking modulation and the Nth harmonic of a clockwise (CCW) resonance tracking modulation may differ due to non-linearities in the RFOG. Embodiments of the invention diminish, e.g., reduce to zero such vectoral difference. Differential harmonics may be generated at one or more harmonics.

公开(公告)号：US20210262799A1

公开(公告)日：2021-08-26

申请号：US16799663

申请日：2020-02-24

Applicant: Honeywell International Inc.

Inventor： Marc Smiciklas ,  Glen A. Sanders ,  Lee K. Strandjord

IPC: G01C19/72

Abstract: A resonator fiber optic gyroscope (RFOG) that includes at least one laser, a resonator and a resonator hopping control system is provided. The resonator is in operational communication with the at least one laser to receive a clockwise (CW) laser light and counterclockwise (CCW) laser light produced by the at least one laser. The resonance hopping control system is in communication with an output of the resonator and the at least one laser. The resonance hopping control system is configured to control an output of the at least one laser to periodically unlock, hop and lock frequencies of the laser light traveling in the CW and CCW directions in the resonator to resonance frequencies of the resonator to mitigate bias errors due to resonance asymmetries.

公开(公告)号：US20210254977A1

公开(公告)日：2021-08-19

申请号：US16795365

申请日：2020-02-19

Applicant: Honeywell International Inc.

Inventor： Norman Gerard Tarleton ,  Chuck Croker ,  Lee K. Strandjord

IPC: G01C19/72 ,  H03L7/099 ,  H03L7/093 ,  H03L7/10

Abstract: In one embodiment, a phase lock loop circuit includes a control circuit, wherein the control circuit is configured to input an estimation having a second frequency and a second phase. The second frequency is selected from a range of frequencies including a first frequency from an acquired signal. A numerically controlled oscillator is coupled to the control circuit, wherein the control circuit is configured to control an output response of the numerically controlled oscillator. The numerically controlled oscillator is configured to receive the estimation from the control circuit and generate an output signal in response to the estimation. A phase detector is coupled to the control circuit and the numerically controlled oscillator, wherein the phase detector is configured to compare the first signal and the output signal and produce a comparison output, the comparison output indicative of a phase difference between the first signal and the estimation.