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Développement d’un accéléromètre atomique compact pour la gravimétrie de terrain et la navigation inertielle

Abstract : We present the development of a compact atomic gravimeter, relying on atom interferometry using stimulated Raman transitions. We demonstrate a significant improvement in terms of compactness and simplicity for each element of the device (sensor head, laser source, micro-wave frequency reference, vibration rejection system). This work relies on the use of a hollow-pyramid in place of the usual retro-reflecting mirror. This component allows realizing each step of measurement (trapping and cooling of the atoms, interferometer, detection) with a single laser beam. We developed a very compact sensor head, for which we have simplified every key element. The laser source features only one single laser diode, emitting at 1560 nm to interrogate Rubidium 87 atoms. It benefits from the use of fibered optical telecom components, which have already demonstrated to be performing and robust to environmental conditions. All the elements of the accelerometer prototype are now gathered to allow for the operation of the interferometer. On-field gravimetry will greatly benefit from such compact absolute gravimeter. In parallel, we have developed a novel vibration rejection method, based on digital electronics. The atomic phase shift induced by vibrations is pre-compensated before the recombination of the wave-packets, directly on the optical phase on the Raman lasers. This ensures that each measurement point stays at maximum sensitivity, even in the presence of great acceleration noise. As a result, for a gravimeter operating directly on the ground in an urban environment, we have reached sensitivity to acceleration at a level of at 1 s, which improves down to after 300 s. Finally, our method lead us to fully hybridize the atom gravimeter with a classical accelerometer, which results in an accurate very large-band accelerometer [DC , 430 Hz]. This demonstration is very promising for applications in inertial navigation.
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https://tel.archives-ouvertes.fr/tel-01068005
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Submitted on : Wednesday, September 24, 2014 - 3:22:16 PM
Last modification on : Saturday, September 19, 2020 - 4:52:53 AM
Long-term archiving on: : Thursday, December 25, 2014 - 11:00:28 AM

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  • HAL Id : tel-01068005, version 1

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Jean Lautier-Blisson. Développement d’un accéléromètre atomique compact pour la gravimétrie de terrain et la navigation inertielle. Autre [cond-mat.other]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066121⟩. ⟨tel-01068005⟩

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