公开(公告)号：US20150331142A1

公开(公告)日：2015-11-19

申请号：US14704556

申请日：2015-05-05

Applicant: THALES

Inventor： Mahdi Ammar ,  Sylvain Schwartz ,  Landry Huet

IPC: G01V7/02

CPC classification number: G01V7/02 ,  G01V7/00

Abstract: The general field of the invention is that of matter-wave gravimeters. The gravimeter according to the invention comprises at least: means for generating, for capturing and for cooling a cloud of ultra-cold atoms; means of transferring the atoms into a superposition, with equal weights, of a first internal electronic state called state |1>) and of a second internal electronic state called state |2> comprising the application of at least a first microwave field and of a radiofrequency field; means for separating the atoms into two wave packets for a given period of time under the effect of at least a second microwave field, the said separation leading to a phase-shift associated with the local gravitational field; calibration means allowing a “magic” magnetostatic field to be determined for which the difference in energy between the first internal electronic state and the second internal electronic state is independent, to a first order, of the fluctuations of the magnetostatic field.

Abstract translation: 本发明的一般领域是物波重力仪。 根据本发明的重力计至少包括：用于产生用于捕获和冷却超冷原子云的装置; 将原子转移成称重状态的第一内部电子状态称为状态| 1>的叠加和称为状态| 2>的第二内部电子状态的装置，包括至少应用第一微波场和 射频场 用于在至少第二微波场的作用下将原子分离为两个波包达给定时间段的装置，所述分离导致与局部重力场相关联的相移; 校准装置允许确定第一内部电子状态和第二内部电子状态之间的能量差异与静磁场的波动的第一级独立的“魔术”静磁场。

公开(公告)号：US10859378B2

公开(公告)日：2020-12-08

申请号：US15453818

申请日：2017-03-08

Applicant: THALES ,  Association pour la Recherche et le Développement de Méthodes et Processus Industriels, ARMINES

Inventor： Noad Hamze El Badaoui ,  Pierre Rouchon ,  Gilles Feugnet ,  Sylvain Schwartz ,  Philippe Martin

IPC: G01C19/66

Abstract: An iterative method for determining scattering coefficients of the cavity of a laser gyro in operation supporting two counter-propagating modes, comprises steps of: determining a set of variables dependent on characteristic physical quantities of the laser gyro, one reference variable per dependency relationship being selected from the variables; measuring values of the characteristic physical quantities of the laser gyro in operation; determining measured values of the variables; estimating, via an iterative method, estimated values of the coefficients minimising a discrepancy between the measured values of the reference variables and estimated values of the reference variables, which are estimated from the values of the coefficients and the measured values of the variables other than the reference variables; and determining estimated values of the scattering coefficients from the estimated values of the coefficients.

公开(公告)号：US10371524B2

公开(公告)日：2019-08-06

申请号：US15480129

申请日：2017-04-05

Applicant: THALES ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  ECOLE NORMALE SUPERIEURE DE CACHAN

Inventor： Sylvain Schwartz ,  Gilles Feugnet ,  Arnaud Brignon ,  Fabien Bretenaker

IPC: G01C19/72

Abstract: A passive resonant optical gyroscope comprising a cavity and operating with three frequencies comprises: a first injecting laser to inject a first optical beam into the cavity in a first direction; a second injecting laser to inject a second optical beam into the cavity in an opposite direction; a third injecting laser to inject a third optical beam into the cavity in one of the aforementioned directions, one laser amongst the injecting lasers having a master frequency, the two other injecting lasers, called the first and second slave lasers, respectively having a first slave frequency and a second slave frequency; a master servocontrol device; a first servocontrol stage comprising first and second slave devices; and a second servocontrol stage comprising first and second optical phase-locking devices respectively comprising a first and second slave oscillator to generate a first radiofrequency offset signal and a second radiofrequency offset signal.

公开(公告)号：US09791593B2

公开(公告)日：2017-10-17

申请号：US14704556

申请日：2015-05-05

Applicant: THALES

Inventor： Mahdi Ammar ,  Sylvain Schwartz ,  Landry Huet

IPC: G01V7/02 ,  G01V7/00

CPC classification number: G01V7/02 ,  G01V7/00

Abstract: The general field of the invention is that of matter-wave gravimeters. The gravimeter according to the invention comprises at least: means for generating, for capturing and for cooling a cloud of ultra-cold atoms; means of transferring the atoms into a superposition, with equal weights, of a first internal electronic state called state |1>) and of a second internal electronic state called state |2> comprising the application of at least a first microwave field and of a radiofrequency field; means for separating the atoms into two wave packets for a given period of time under the effect of at least a second microwave field, the said separation leading to a phase-shift associated with the local gravitational field; calibration means allowing a “magic” magnetostatic field to be determined for which the difference in energy between the first internal electronic state and the second internal electronic state is independent, to a first order, of the fluctuations of the magnetostatic field.

公开(公告)号：US10375813B2

公开(公告)日：2019-08-06

申请号：US15778605

申请日：2016-11-24

Applicant: THALES

Inventor： Matthieu Dupont-Nivet ,  Sylvain Schwartz

IPC: G01C19/64 ,  H05H3/00

Abstract: Ultra-cold atom sensor for measuring a rotational velocity along a measurement axis comprises: means designed to generate a first and a second ultra-cold atom trap, one trap making it possible to immobilize a cloud of ultra-cold atoms in an internal state different from the other trap, at a predetermined distance from the measurement plane, the means comprising, at least one first and one second waveguide that are designed to propagate microwaves with angular frequencies ωa and ωb, the waveguides being non-secant and positioned symmetrically about an axis called the axis of symmetry, conductive wires integrated into the chip and designed to be flowed through by DC currents, the means being configured to modify the energy of the ultra-cold atoms in such a way as to create a potential minimum for the ultra-cold atoms in the internal state |a> and a potential minimum for the ultra-cold atoms in the internal state |b>, thus forming the first and second ultra-cold atom traps, and to move the traps along a closed path, traveled in one direction by the ultra-cold atoms of the first trap and in the opposite direction by the ultra-cold atoms of the second trap.

公开(公告)号：US10436811B2

公开(公告)日：2019-10-08

申请号：US15778607

申请日：2016-11-07

Applicant: THALES

Inventor： Matthieu Dupont-Nivet ,  Sylvain Schwartz ,  Arnaud Brignon ,  Jérôme Bourderionnet

IPC: G01C19/58 ,  G01C19/60 ,  G01C19/62 ,  G01C19/64 ,  G01P15/093 ,  G01P15/08 ,  H01S3/13 ,  H01S5/02 ,  H01S5/026 ,  H01S5/068 ,  H01S5/0687 ,  H01S5/12 ,  H01S5/40 ,  H01S5/50 ,  H01S3/10 ,  H01S3/00

Abstract: A laser-source assembly that is configured to illuminate a vacuum chamber containing atoms in the gaseous state so as to implement a cold-atom inertial sensor, the atoms having at least two fundamental levels that are separated by a fundamental frequency difference comprised between 1 and a few gigahertz, the assembly comprises: a master laser that emits a beam having a master frequency; a first control loop that is configured to stabilize the master frequency of the master laser on a frequency corresponding to half a set frequency of an atomic transition between a fundamental level and an excited level of the atoms; a slave laser that has a slave frequency; and a second control loop that is configured to stabilize the slave frequency of the slave laser with respect to the master frequency, the slave frequency being offset with respect to the master frequency successively, over time, by a first preset offset value, a second preset offset value, and a third preset offset value, the offset values being comprised in an interval equal to half the fundamental frequency difference plus or minus a few hundred MHz.

公开(公告)号：US09803981B2

公开(公告)日：2017-10-31

申请号：US14504322

申请日：2014-10-01

Applicant: THALES

Inventor： Sylvain Schwartz ,  Gilles Feugnet ,  Fabien Bretenaker

IPC: G01C19/66 ,  G01C19/72

CPC classification number: G01C19/667 ,  G01C19/726

Abstract: The general field of the invention is that of passive resonator gyros comprising an injection laser emitting an initial optical beam at a first frequency and a fiber optic cavity. The gyro according to the invention operates with three optical beams at three different optical frequencies. A first beam is injected in a first direction of rotation, the second and the third beam are injected in the contrary direction. The gyro includes three slaving devices maintaining each optical frequency at a specific mode of resonance of the cavity. The gyro includes means for measuring the frequency differences existing between the different frequencies. Combined together, these differences are representative of the length of the cavity and the angular rotational velocity of the cavity along an axis perpendicular to its plane.

公开(公告)号：US20150098089A1

公开(公告)日：2015-04-09

申请号：US14504322

申请日：2014-10-01

Applicant: THALES

Inventor： Sylvain Schwartz ,  Gilles Feugnet ,  Fabien Bretenaker

IPC: G01C19/66

CPC classification number: G01C19/667 ,  G01C19/726

Abstract: The general field of the invention is that of passive resonator gyros comprising an injection laser emitting an initial optical beam at a first frequency and a fibre optic cavity. The gyro according to the invention operates with three optical beams at three different optical frequencies. A first beam is injected in a first direction of rotation, the second and the third beam are injected in the contrary direction. The gyro includes three slaving devices maintaining each optical frequency at a specific mode of resonance of the cavity. The gyro includes means for measuring the frequency differences existing between the different frequencies. Combined together, these differences are representative of the length of the cavity and the angular rotational velocity of the cavity along an axis perpendicular to its plane.

Abstract translation: 本发明的一般领域是包括在第一频率处发射初始光束的注入激光器和光纤腔的无源谐振器陀螺仪。 根据本发明的陀螺仪以三个不同光频率的三个光束操作。 第一光束以第一旋转方向注入，第二光束和第三光束以相反的方向注入。 陀螺仪包括保持每个光学频率处于空腔的特定谐振模式的三个从动装置。 陀螺仪包括用于测量不同频率之间存在的频率差的装置。 结合在一起，这些差异代表腔的长度和空腔沿着垂直于其平面的轴的角旋转速度。