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公开(公告)号：US09874446B2
公开(公告)日：2018-01-23
申请号：US14692773
申请日：2015-04-22
Inventor： Sihong Gu , Yi Zhang , Jiehua Chen , Hongwei Wu , Yuanchao Wang
IPC: G01C19/62
CPC classification number: G01C19/62
Abstract: A physical unit of a chip-scale nuclear magnetic resonance (NMR) gyroscope, the physical unit including: a vertical cavity surface emitting laser (VCSEL), a silicon sheet including a recess, a glass sheet, an atomic vapor chamber, a first right angle prism, a quarter-wave plate, a polarizing beam splitter, and photodetectors. The recess includes sides including reflecting mirrors. The glass sheet is disposed on the silicon sheet. The recess of the silicon sheet is in a structure of an inverted square frustum, and the reflecting mirrors are disposed on sides of the recess. The atomic vapor chamber is an enclosed region formed between the recess and the glass sheet. The atomic vapor chamber is filled with alkali metal atoms, one or a plurality of inert gas atoms, and one or a plurality of buffer gases.
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公开(公告)号：US20170276741A1
公开(公告)日：2017-09-28
申请号：US15080876
申请日：2016-03-25
Applicant: MICHAEL D. BULATOWICZ
Inventor： MICHAEL D. BULATOWICZ
IPC: G01R33/26 , G01R33/032
CPC classification number: G01R33/26 , G01C19/62 , G01N24/006 , G01R33/0041 , G01R33/0322
Abstract: One example includes a sensor system. A cell system includes a pump laser which generates a pump beam to polarize alkali metal vapor enclosed within a sensor cell. A detection system includes a probe laser to generate a probe beam. The detection system can calculate at least one measurable parameter based on characteristics of the probe beam passing through the sensor cell resulting from precession of the polarized alkali metal vapor in response to an applied magnetic field. A pump beam control system pulse-width modulates a frequency of the pump beam to provide a pulse-width modulated (PWM) pump beam, and controls a duty-cycle of the PWM pump beam based on the characteristics of the probe beam passing through the sensor cell in a feedback manner to control polarization uniformity of the alkali metal vapor and to mitigate the effects of AC Stark shift on the at least one measurable parameter.
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公开(公告)号：US09689679B2
公开(公告)日：2017-06-27
申请号：US14504720
申请日：2014-10-02
Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Inventor： Dmitry Budker , Micah Ledbetter , Kasper Jensen , Andrey Jarmola
Abstract: A solid-state gyroscope apparatus based on ensembles of negatively charged nitrogen-vacancy (NV−) centers in diamond and methods of detection are provided. In one method, rotation of the NV− symmetry axis will induce Berry phase shifts in the NV− electronic ground-state coherences proportional to the solid angle subtended by the symmetry axis. A second method uses a modified Ramsey scheme where Berry phase shifts in the 14N hyperfine sublevels are employed.
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公开(公告)号：US20170138735A1
公开(公告)日：2017-05-18
申请号：US15218401
申请日：2016-07-25
Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventor： Paola Cappellaro , Ashok Ajoy
Abstract: An n-NV-based gyroscope is provided that includes a diamond structure implanted with a plurality of NV centers, whose nuclear spins form a spin gyroscope. A number of radio-frequency (rf) coils and microwave (μw) co-planar waveguides are fabricated on the diamond structure to provide a sensitive and stable three-axis gyroscope in the solid state while achieving gyroscopic sensitivity by exploiting the coherence time of the 14N nuclear spin associated with the NV centers in the diamond structure combined with the efficient optical polarization and measurement of electronic spin.
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公开(公告)号：US09618362B2
公开(公告)日：2017-04-11
申请号：US14295091
申请日：2014-06-03
Applicant: Michael D. Bulatowicz , Michael S. Larsen
Inventor： Michael D. Bulatowicz , Michael S. Larsen
CPC classification number: G01C25/00 , G01C19/62 , G01C25/005
Abstract: One embodiment includes a nuclear magnetic resonance (NMR) gyroscope system. The system includes a vapor cell comprising an alkali metal and a plurality of gyromagnetic isotopes and a pump laser configured to generate an optical pump beam configured to spin-polarize the alkali metal. The system also includes a probe laser that generates an optical probe beam and a detection system configured to monitor the optical probe beam and to calculate a rotation of the NMR gyroscope system about a sensitive axis based on a modulation of the optical probe beam in response to precession of the plurality of gyromagnetic isotopes resulting from the spin-polarization of the alkali metal. The system further includes a calibration controller that modulates a characteristic of the optical pump beam to substantially mitigate bias errors associated with the gyromagnetic isotopes in the calculation of the rotation of the NMR gyroscope system about the sensitive axis.
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Patent Agency Ranking
公开(公告)号：US20160298967A1
公开(公告)日：2016-10-13
申请号：US14214767
申请日：2014-03-15
Applicant: The Charles Stark Draper Laboratory, Inc.
Inventor： David M.S. Johnson , David L. Butts , Richard E. Stoner
CPC classification number: G01C19/62 , G01B9/02 , G01C19/58 , G01C21/165 , G01C21/18 , G01P9/02 , G01P15/08
Abstract: Compact inertial measurement systems and methods based on atom interferometry. Certain examples provide a combination atomic accelerometer-gyroscope configured to recapture and cycle atom samples through atom interferometers arranged to allow the next measurement to use the atoms from the previous measurement. Examples of the apparatus provide inertial measurements indicative of rotation for different inertial axes by applying atom interferometry to a plurality of atom samples launched in opposite directions to allow for measurement of both acceleration and rotation rates. In some examples, the inertial measurement apparatus provide a combined atomic gyroscope and an atomic accelerometer in a compact six Degrees of Freedom (6 DOF) IMU.
Abstract translation: 基于原子干涉测量的紧凑型惯性测量系统和方法。 某些示例提供了一种组合原子加速度计 - 陀螺仪，其被配置为通过布置成允许下次测量使用来自先前测量的原子的原子干涉仪来重新捕获和循环原子样品。 该装置的实例通过将原子干涉测量法应用于沿相反方向发射的多个原子样品，提供表示不同惯性轴的旋转的惯性测量，以允许测量加速度和旋转速率。 在一些示例中，惯性测量装置提供了一种紧凑的六自由度（6自由度）IMU中的组合原子陀螺仪和原子加速度计。
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公开(公告)号：US20150369604A1
公开(公告)日：2015-12-24
申请号：US14542844
申请日：2014-11-17
Applicant: Microsemi Corporation
Inventor： Kim Richard OVERSTREET, II
IPC: G01C19/62
Abstract: Apparatuses and methods for sensing rotations are provided. One embodiment provides an apparatus including a cell containing alkali and active nuclear magnetic resonance (NMR) isotope(s) atoms, a magnet providing a first magnetic field, a light source emitting diverging light that passes through the cell, and optics which circularly polarize the diverging light. A longitudinal component of the diverging light optically pumps the alkali atoms and, in conjunction with a second magnetic field orthogonal to the first magnetic field or a modulation of the diverging light, causes the alkali and NMR isotope atoms to precess about the first field. A transverse component of the diverging light acts as a probe beam for observing the precession. The apparatus further includes a polarizing beam splitter to split light that has passed through the cell into orthogonally polarized components detected by respective photodetectors and used to determine rotations relative to an inertial frame.
Abstract translation: 提供了用于感测旋转的装置和方法。 一个实施方案提供了一种装置，其包括含有碱金属和活性核磁共振（NMR）同位素原子的电池，提供第一磁场的磁体，发射通过电池的发散光的光源， 发散光 发散光的纵向分量将碱性原子光学泵送，并且与第一磁场正交的第二磁场或发散光的调制结合，导致碱和NMR同位素原子围绕第一场进行。 发散光的横向分量用作探测光束，用于观察进动。 该装置还包括一个偏振光束分离器，它将已经通过单元的光分成由各个光电检测器检测到的正交极化分量，并用于确定相对于惯性框架的转动。
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公开(公告)号：US20150090033A1
公开(公告)日：2015-04-02
申请号：US14504720
申请日：2014-10-02
Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Inventor： Dmitry Budker , Micah Ledbetter , Kasper Jensen , Andrey Jarmola
Abstract: A solid-state gyroscope apparatus based on ensembles of negatively charged nitrogen-vacancy (NV−) centers in diamond and methods of detection are provided. In one method, rotation of the NV− symmetry axis will induce Berry phase shifts in the NV− electronic ground-state coherences proportional to the solid angle subtended by the symmetry axis. A second method uses a modified Ramsey scheme where Berry phase shifts in the 14N hyperfine sublevels are employed.
Abstract translation: 提供了一种基于钻石中带负电荷的氮空位（NV-）中心和检测方法的固态陀螺仪设备。 在一种方法中，NV对称轴的旋转将导致与对称轴对称的立体角成比例的NV-电子基态相干中的Berry相移。 第二种方法使用改进的Ramsey方案，其中采用14N超精细亚水平中的浆果相移。
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公开(公告)号：US08994371B2
公开(公告)日：2015-03-31
申请号：US13332536
申请日：2011-12-21
Applicant: Michael S. Larsen , Robert Griffith , Michael D. Bulatowicz , Philip R. Clark
Inventor： Michael S. Larsen , Robert Griffith , Michael D. Bulatowicz , Philip R. Clark
CPC classification number: G01R33/0041 , G01C19/62 , G01R33/1284 , G01R33/26
Abstract: One embodiment of the invention includes an atomic sensing system. The system includes an atomic sensing device configured to generate an output signal along an output axis in response to a plurality of control parameters. The system also includes a signal generator configured to apply a reference signal to a cross-axis that is approximately orthogonal to the output axis. The system also includes a phase measurement system configured to demodulate the output signal relative to the reference signal to measure a relative phase alignment between the output axis and a physical axis of the atomic sensing device based on the reference signal.
Abstract translation: 本发明的一个实施例包括原子感测系统。 该系统包括原子感测装置，其被配置为响应于多个控制参数沿着输出轴产生输出信号。 该系统还包括信号发生器，该信号发生器被配置为将参考信号施加到大致正交于输出轴的交叉轴。 该系统还包括相位测量系统，其被配置为相对于参考信号解调输出信号，以基于参考信号来测量原子感测装置的输出轴和物理轴之间的相对相位对准。
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公开(公告)号：US20130033261A1
公开(公告)日：2013-02-07
申请号：US13198940
申请日：2011-08-05
Applicant: Thad Gilbert Walker , Brian Rober Lancor , Robert Wyllie
Inventor： Thad Gilbert Walker , Brian Rober Lancor , Robert Wyllie
IPC: G01R33/44
Abstract: Precise measurements of a precessional rate of noble gas in a magnetic field is obtained by constraining the time averaged direction of the spins of a stimulating alkali gas to lie in a plane transverse to the magnetic field. In this way, the magnetic field of the alkali gas does not provide a net contribution to the precessional rate of the noble gas.
Abstract translation: 通过将刺激性碱性气体的自旋的时间平均方向约束在横向于磁场的平面中来获得磁场中稀有气体的进动速率的精确测量。 以这种方式，碱性气体的磁场不会对惰性气体的进动速率产生净贡献。
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