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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
发明人： Glen A. Sanders , Marc Smiciklas
IPC分类号： G01C19/72
CPC分类号： G01C19/727 , G01C19/722 , G01C19/726
摘要： 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：US12072189B2
公开(公告)日：2024-08-27
申请号：US17818570
申请日：2022-08-09
发明人： Hung-Pin Chung , Bor-Wen Shiau , Sheng-Han Chang , Chii-Chang Chen , Yen-Hung Chen , Jann-Yenq Liu
CPC分类号： G01C19/726 , G01J1/44
摘要： A feedback module is formed with modules comprising a schedule hardware register module and a computation circuit module. The schedule hardware register module receives a modulation signal and a sensing signal, and schedules and temporarily stores signal values of the sensing signal in successive half modulation cycles in sequence by taking a half modulation cycle as a time interval to obtain a temporarily stored sensing signal which has been scheduled. In each half modulation cycle, the computation circuit module calculates a differential signal value of the temporarily stored sensing signal between the previous two half modulation cycles, and outputs the differential signal value as a signal value of the feedback signal. The schedule hardware register module temporarily stores the feedback signal, and the feedback module feedbacks the feedback signal to an integrated optics chip of the photoelectric sensing system integrated optics chip.
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公开(公告)号：US20240230901A1
公开(公告)日：2024-07-11
申请号：US18559826
申请日：2022-05-11
发明人： Kazem ZANDI , Ramanand TEWARI
IPC分类号： G01S17/26 , G01C19/72 , G01S7/481 , G01S17/931
CPC分类号： G01S17/26 , G01C19/721 , G01C19/725 , G01S7/4811 , G01S17/931
摘要： The present disclosure provides a LIDAR-gyroscope chip assembly (also referred to as GIDAR) for autonomous vehicle navigation application. The chip assembly includes a silicon substrate, a LIDAR chip assembly disposed on the substrate, and a gyroscope disposed on the substrate in order to form one integrated sensing chip performing both inertial and LIDAR sensing. The single chip integration can be improved by using silicon nitride to form the LIDAR chip assembly components and the components of the gyroscope. Incorporating chip-based inertial measurement unit (IMU) and LIDAR system onto a single chip, leads to power, weight, and size reduction for autonomous vehicles navigation applications, especially for small drones and small robots where the vehicle is limited to size and power consumption. Due to the full integration of all elements onto one chip, the devices as described herein will be less sensitive to environmental perturbations such as shocks and vibrations compared to conventional devices.
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公开(公告)号：US20240168220A1
公开(公告)日：2024-05-23
申请号：US18426979
申请日：2024-01-30
CPC分类号： G02B6/02328 , G02B6/02357 , G02B6/02366 , G02B6/02371 , G01C19/727
摘要： An interferometric optical fibre sensor comprises optical fibre defining an optical circuit configured to propagate a first optical wave via an environment in which the optical fibre can be exposed to a stimulus that modifies the first optical wave, and a second optical wave, and to combine the first optical wave and the second optical wave to create an interference signal containing information about the stimulus, wherein optical fibre propagating either or both of the first optical wave and the second optical wave comprises hollow core optical fibre configured to propagate the optical wave or waves by an antiresonant optical guidance effect.
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公开(公告)号：US20240125600A1
公开(公告)日：2024-04-18
申请号：US18379610
申请日：2023-10-12
发明人： Mario Paniccia , Mike Horton , Chris Wagner
CPC分类号： G01C19/721 , G01S19/13
摘要： The present disclosure relates to integration of integrated photonics-based optical gyroscopes and fiber-based optical gyroscopes into portable apparatuses that may include compass features. Novel small-footprint modularized fully integrated photonics optical gyroscopes are used for non-critical axes. However, for at least one critical axis, a fiber-optic gyroscope can be used to provide bias stability below 0.1°/Hr, which is directly correlated to predicting positional accuracy in the centimeter range. The positional accuracy results from the compassing ability of the gyroscope (referred to as gyrocompass) to calculate direction of heading using the earth's rotation.
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公开(公告)号：US11920933B2
公开(公告)日：2024-03-05
申请号：US17171858
申请日：2021-02-09
CPC分类号： G01C19/661 , G01C19/728 , H01S3/1086
摘要： Techniques for reducing the bias error present in optical gyroscopes is disclosed. Such techniques include at least one path length adjustment member placed in an optical gyroscope resonator, which are configured to modulate the optical path length of the resonator so that bias errors attributable to the optical path length are shifted outside of the bandwidth of the optical gyroscope. In some embodiments, the at least one path length adjustment member includes a plurality of microheaters coupled to the resonator, in which case optical path length modulation is achieved by heating the resonator via the microheaters. Alternatively, a plurality of piezo-electric regions can be placed in the resonator, which enables optical path length modulation through electric field gradients applied to the piezo-electric regions.
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公开(公告)号：US11885622B2
公开(公告)日：2024-01-30
申请号：US17603797
申请日：2020-04-14
申请人： EXAIL
发明人： Eric Ducloux , Cédric Molucon , Hervè Lefevre
CPC分类号： G01C19/727 , G01R15/246
摘要： A fiber-optic interferometer is designed to receive and propagate a first single-mode wave along a first optical path and, respectively, a second single-mode wave along a second optical path, the second optical path being the reverse of the first optical path, and to form a first output wave and, respectively, a second output wave, having a modulated phase difference Δϕm(t). According to the invention, the modulated phase difference Δϕm(t) is equal to sum of a first periodic phase difference Δϕπ(t) having a level equal to ±π, a second periodic phase difference Δϕalpha(t) having a level equal to ±alpha and a third periodic phase difference Δϕbeta(t) having a variable level between −beta and +beta, said modulated phase difference Δϕm(t) comprising per modulation period T at least eight modulation levels among twelve modulation levels and said modulated phase difference between such that: Δϕm(t+T/2)=−Δϕm(t).
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8.发明公开公开(公告)号：US20230417535A1
公开(公告)日：2023-12-28
申请号：US18344651
申请日：2023-06-29
申请人： Huvr, Inc
发明人： Zbigniew Sobolewski
IPC分类号： G01B9/02015 , G01C19/72
CPC分类号： G01B9/02023 , G01C19/728 , G01C19/727
摘要： An optical fiber ring interferometer is provided, which is based on a common light path for two or more light beam pairs preferably originated from two or more light sources of a substantially different spectrum or from a single light source split spectrum and whereas each light beam of a specific pair is propagating in relative opposite directions, wherein at least one pair of light beams is utilized to detect acousto-mechanical events and to provide information regarding location and other characteristics of detected environmental disturbance.
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公开(公告)号：US11846805B2
公开(公告)日：2023-12-19
申请号：US17942840
申请日：2022-09-12
发明人： Avi Feshali , Mario Paniccia , Warren Bruce Jin
CPC分类号： G02B6/125 , G01C19/72 , G02B6/1225 , G02B2006/12107 , G02B2006/12138
摘要： Aspects of the present disclosure are directed to structural modifications introduced in a waveguide structure in order to more tightly pack adjacent waveguide turns in an optical gyroscope fabricated on a planar silicon platform as a photonic integrated circuit. Increasing number of turns of the gyroscope coil increases total waveguide length as well as enclosed area of the gyroscope loop, which translates to increased sensitivity to rotational measurement.
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公开(公告)号：US11808577B2
公开(公告)日：2023-11-07
申请号：US17780668
申请日：2020-09-24
发明人： Ryotaro Inoue , Mikio Kozuma , Atsushi Tanaka
CPC分类号： G01C19/721 , G01C19/58 , G01P3/36 , G01P15/14 , G02F1/11 , G02F2/02 , G02F1/093 , G02F2201/02
摘要： An atomic interferometer includes: an optical system including an optical modulating device that includes: an optical fiber for a first laser beam to propagate therein; and a frequency shifter connected to the optical fiber and configured to shift the frequency of the first laser beam, the optical system being configured to generate a moving standing light wave from counter-propagation of the first laser beam from the optical modulating device and a second laser beam; and an interference system for making an atomic beam interact with three or more moving standing light waves including the moving standing light wave.
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