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Étude d'un gyromètre à atomes froids

Abstract : We present the study of an inertial sensor based on matter-wave interferences. This device gives high precision measurement for both rotation rate and acceleration. In contrast with previous analog setups we emphasize on the long term stability and the compactness of the device by the use of laser cooled atoms. Two cold atomic sources of Cesium are launched on counter-propagating parabolic trajectories.
At the top of the trajectory, the atoms interact with light pulses inducing stimulated Raman transitions (pi/2-pi-pi/2 pulse sequence). These pulses split, deflect and recombine the wave-packets to realize the interferometer. The phase difference measured at the output of the interferometer is linked to the acceleration and the rotation rate of the device. This signal is also sensitive to some imperfections of the experimental setup which can impact the stability (laser phase noise, magnetic field fluctuation, vibration noise) or the accuracy (magnetic field gradients, trajectories imperfections, light shifts) of the measurement. The influence of these effects is analyzed. We also study the improvements of the setup (mainly concerning the atomic trajectories) and the stability obtained in configurations using horizontal and vertical Raman lasers. In this case, the sensitivity reached is respectively 3,5 10^-7 rad.s^-1 and 8 10^-7 m.s^-2 in 1 s for rotation and acceleration measurement. We present a first study of the accuracy of the measurement by using the Earth rotation.
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https://tel.archives-ouvertes.fr/tel-00193288
Contributor : Benjamin Canuel <>
Submitted on : Monday, December 3, 2007 - 11:23:47 AM
Last modification on : Tuesday, December 8, 2020 - 3:39:57 AM
Long-term archiving on: : Monday, April 12, 2010 - 5:49:58 AM

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  • HAL Id : tel-00193288, version 1

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Benjamin Canuel. Étude d'un gyromètre à atomes froids. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00193288⟩

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