公开(公告)号：US20170299390A1

公开(公告)日：2017-10-19

申请号：US15480129

申请日：2017-04-05

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

发明人： Sylvain SCHWARTZ ,  Gilles FEUGNET ,  Arnaud BRIGNON ,  Fabien BRETENAKER

IPC分类号： G01C19/72

CPC分类号： G01C19/727

摘要： 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：US20170268881A1

公开(公告)日：2017-09-21

申请号：US15453818

申请日：2017-03-08

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

发明人： Noad HAMZE EL BADOUI ,  Pierre ROUCHON ,  Gilles FEUGNET ,  Sylvain SCHWARTZ ,  Philippe MARTIN

IPC分类号： G01C19/66

CPC分类号： G01C19/661 ,  G01C19/664

摘要： 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：US20180356441A1

公开(公告)日：2018-12-13

申请号：US15778607

申请日：2016-11-07

申请人： THALES

发明人： Matthieu DUPONT-NIVET ,  Sylvain SCHWARTZ ,  Arnaud BRIGNON ,  Jérôme BOURDERIONNET

IPC分类号： G01P15/093 ,  G01C19/58 ,  H01S5/0687 ,  H01S5/40 ,  H01S5/50 ,  H01S5/026 ,  H01S5/068 ,  H01S5/02 ,  H01S5/12

CPC分类号： G01P15/093 ,  G01C19/58 ,  G01P15/08 ,  H01S3/0085 ,  H01S3/10084 ,  H01S3/1303 ,  H01S3/1307 ,  H01S5/021 ,  H01S5/026 ,  H01S5/06821 ,  H01S5/0687 ,  H01S5/12 ,  H01S5/4025 ,  H01S5/50

摘要： 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：US20180352642A1

公开(公告)日：2018-12-06

申请号：US15778605

申请日：2016-11-24

申请人： THALES

发明人： Matthieu DUPONT-NIVET ,  Sylvain SCHWARTZ

IPC分类号： H05H3/00 ,  G01C19/64

CPC分类号： H05H3/00 ,  G01C19/64

摘要： 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.