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1.发明申请公开(公告)号：US20240426610A1
公开(公告)日：2024-12-26
申请号：US18341281
申请日：2023-06-26
Applicant: Honeywell International Inc.
Inventor： Tiequn Qiu , Jianfeng Wu , Matthew Wade Puckett , Steven Tin , Glen A. Sanders
Abstract: Various examples of a closed-loop optical gyroscope are disclosed. The closed-loop optical gyroscope includes a broadband light source configured to generate broadband optical signal(s). The broadband optical signal(s) propagate in an optical resonator and are coupled in and out of the optical resonator by optical couplers. A phase modulator applies phase modulation to the optical signal(s) based on a sawtooth modulation signal. The optical signal(s) repropagate in the optical resonator in a different direction. The optical signal(s) are then received and analyzed to determine parameter(s) of the phase modulator. One or more processors configure the phase modulator based on the determined parameter(s).
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公开(公告)号：US20240401951A1
公开(公告)日：2024-12-05
申请号：US18326867
申请日：2023-05-31
Applicant: Honeywell International Inc.
Inventor： Marc Smiciklas , Glen A. Sanders , Norman Gerard Tarleton
IPC: G01C19/72
Abstract: A Pound-Drever-Hall (PDH) offset servo circuit is configured to compensate for offset error identified from a received signal in an optical gyroscope. The PDH offset servo circuit determines offset error information from a quadrature-demodulated counterpropagating signal in the optical gyroscope, and uses the offset error information to generate a compensated PDH error signal. The compensated PDH error signal can be used to adjust the setpoint of the PDH loop circuitry, thereby enabling the PDH loop circuitry to generate a control signal to a laser that controls the frequency output of the laser with reduced offset error.
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公开(公告)号：US20240344827A1
公开(公告)日：2024-10-17
申请号：US18298704
申请日：2023-04-11
Applicant: Honeywell International Inc.
Inventor： Glen A. Sanders , Marc Smiciklas
IPC: G01C19/72
CPC classification number: G01C19/727 , G01C19/722 , G01C19/726
Abstract: A method for a resonant fiber optic gyroscope is provided. The method includes locking a frequency of a light wave from a master laser to a resonant frequency of a fiber optic resonator; phase locking a first slave laser to the frequency of the master laser at a first offset frequency; combining the light wave from the master laser with a light wave from the first slave laser; launching the combined light wave in the clockwise (CW) direction in the fiber optic resonator; and prior to combining the light wave from the master laser and the light wave from the first slave laser, shifting the frequency of the light wave from the master laser to avoid interference with a signal produced by pick-up in the first slave laser, that includes a light wave at the frequency of the light wave from the master laser.
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公开(公告)号：US10914587B1
公开(公告)日：2021-02-09
申请号：US16519768
申请日：2019-07-23
Applicant: Honeywell International Inc.
Inventor： Glen A. Sanders , Lee K. Strandjord , Tiequn Qiu , Marc Smiciklas , Norman Gerard Tarleton
IPC: G01C19/72
Abstract: Techniques are provided for correcting for time varying changes to a gyroscope incorporating a resonator and/or to an environment in which the gyroscope is located, and which affect the resonator. Free spectral range of the gyroscope, which varies with such changes, is determined and is used to correct at least one of gyroscope bias and scale factor.
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公开(公告)号：US20200295740A1
公开(公告)日：2020-09-17
申请号：US16353443
申请日：2019-03-14
Applicant: Honeywell International Inc.
Inventor： Lee K. Strandjord , Norman Gerard Tarleton , Jianfeng Wu , Marc Smiciklas , Glen A. Sanders
IPC: H03K5/1252
Abstract: A system, feedback controller and method are disclosed. For example, the feedback controller includes a phase-sensitive quadrature controller configured to generate a first control signal associated with a controlled signal, a phase-sensitive in-phase controller configured to generate a second control signal associated with the controlled signal, a summer configured to add the first control signal and the second control signal, and a subtractor configured to subtract the summed first and second control signals from an uncontrolled signal.
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Patent Agency Ranking
公开(公告)号：US10767995B2
公开(公告)日：2020-09-08
申请号：US16114991
申请日：2018-08-28
Applicant: Honeywell International Inc.
Inventor： Lee K. Strandjord , Marc Smiciklas , Norman Gerard Tarleton , Glen A. Sanders
IPC: G01C19/72
Abstract: A hyperbolic modulation offset reducer circuit for a resonator fiber optic gyro (RFOG) is provided. The circuit includes a first demodulation circuit that is configured to demodulate a received transmission signal from a resonator at twice a sideband heterodyne detection modulation frequency to reject signals due to backscatter. A slave resonance tracking loop of the circuit is coupled to an output of the first demodulation circuit. The slave resonance tracking loop is configured to create an offset frequency signal from the transmission signal that is applied to an optical phase lock loop of a RFOG. A hyperbolic modulator offset control loop is also coupled to the output of the first demodulation circuit. The hyperbolic modulator offset control loop is configured to create a subharmonic common modulation signal from the transmission signal that is coupled to a common phase module in a silicon photonics chip of the RFOG.
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公开(公告)号：US10598492B2
公开(公告)日：2020-03-24
申请号：US15635506
申请日：2017-06-28
Applicant: Honeywell International Inc.
Inventor： Glen A. Sanders , Lee K. Strandjord
Abstract: A resonant fiber optic gyroscope comprises: a ring resonator including a fiber coil fabricated from a first type of hollow core fiber; a light source to produce at least two light beams, wherein a first light beam is configured to travel in a clockwise direction in the ring resonator and a second light beam is configured to travel in a counterclockwise direction in the ring resonator; a filter resonator assembly coupled between the light source and the ring resonator including: at least two short pieces of optical fiber shorter in length than the fiber coil, the at least two short pieces of optical fiber fabricated from the first type of hollow core fiber; and wherein prior to the beams entering the ring resonator, a plurality of reflective devices are configured to condition the beams such that they excite the fundamental mode of the hollow core fiber within the ring resonator.
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公开(公告)号：US20200025568A1
公开(公告)日：2020-01-23
申请号：US16041205
申请日：2018-07-20
Applicant: Honeywell International Inc.
Inventor： Lee K. Strandjord , Simon Ayotte , Glen A. Sanders
IPC: G01C19/72
Abstract: A method comprises receiving a first optical signal and a second optical signal at or near an optical resonator, where the first optical signal includes a clockwise (CW) optical signal and the second optical signal includes a counter clockwise optical signal; injecting the first optical signal and the second optical signal into a resonator loop closure optics system of the optical resonator; sampling a portion of the first optical signal and a portion of the second optical signal; combining the portion of the first optical signal and the second optical signal; converting the combined optical signals to an analog electrical signal; digitizing the analog electrical signal; storing an estimated frequency of a beat signal created by a combination of the CW optical signal and the CCW optical signal; and using the stored estimated beat signal frequency, digitally phase lock to a frequency of the beat signal.
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公开(公告)号：US10415971B2
公开(公告)日：2019-09-17
申请号：US15871709
申请日：2018-01-15
Applicant: Honeywell International Inc.
Inventor： Neil Krueger , Mary Salit , Barbara Vizenor , Glen A. Sanders , Lee K. Strandjord , Tiequn Qiu
Abstract: Bias error in a resonant fiber optic gyroscope (RFOG) is diminished by reducing polarization mismatch between a polarization Eigenstate of optical signals propagating inside of a resonator of the RFOG and the polarization of optical signals being injected into the resonator of the RFOG. The polarization mismatch is reduced by filtering the optical signals circulating in the resonator and the optical signals injected into the resonator with common polarizers.
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公开(公告)号：US20190041215A1
公开(公告)日：2019-02-07
申请号：US15668676
申请日：2017-08-03
Applicant: Honeywell International Inc.
Inventor： Glen A. Sanders , Marc Smiciklas , Tiequn Qiu , Jianfeng Wu , Lee K. Strandjord
CPC classification number: G01C19/727 , G01C19/722 , G01C19/726 , G02B6/02328 , G02B6/02361 , G02F2203/15
Abstract: Systems and methods for reducing polarization-related bias errors in RFOGS are described herein. In certain implementations, an RFOG system includes a fiber optic resonator, one or more laser sources, wherein light from the laser sources launches first and second optical beams into the fiber optic resonator in opposite directions, and an electro-optically tunable devices in the resonator path configured to modulate the phase difference between polarization components in the first and second optical beams as the optical beams propagate within the fiber optic resonator. The system further includes at least one photodetector, wherein the polarization components of the first and second optical beams are incident on the photodetector, wherein the at least one photodetector provides an electrical signal, and at least one processing unit configured to receive the electrical signal and calculate a rotation rate for the RFOG and provide a drive signal for the electro-optically tunable device.
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