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Comptes Rendus Physique
Volume 15, n° 10
pages 851-858 (décembre 2014)
Doi : 10.1016/j.crhy.2014.10.007
The fiber-optic gyroscope, a century after Sagnac's experiment: The ultimate rotation-sensing technology?
Le gyromètre à fibre optique, cent ans après l'expérience de Sagnac : la technologie ultime de mesure inertielle de rotation ?

Hervé C. Lefèvre
 iXBlue SAS, 52, avenue de l'Europe, 78160 Marly-le-Roi, France 

Tel.: +33 1 30 08 88 88; fax: +33 1 30 08 88 00.

Taking advantage of the development of optical-fiber communication technologies, the fiber-optic gyroscope (often abbreviated FOG) started to be investigated in the mid-1970s, opening the way for a fully solid-state rotation sensor. It was firstly seen as dedicated to medium-grade applications (  range), but today, it reaches strategic-grade performance (  range) and surpasses its well-established competitor, the ring-laser gyroscope, in terms of bias noise and long-term stability. Further progresses remain possible, the challenge being the ultimate inertial navigation performance of one nautical mile per month corresponding to a long-term bias stability of  . This paper is also the opportunity to recall the historical context of Sagnac's experiment, the origin of all optical gyros.

The full text of this article is available in PDF format.

Profitant du développement des technologies de télécommunication à fibre optique, le gyromètre à fibre optique a commencé à être étudié au milieu des années 1970, ouvrant la voie à un gyromètre entièrement à état solide. Il a d'abord été considéré comme seulement adapté aux applications de moyenne performance (de l'ordre de  ), mais atteint aujourd'hui des performances de classe stratégique (de l'ordre de  ) et surpasse, en termes de bruit et de dérive à long terme du biais, son concurrent établi, le gyromètre laser. Des progrès supplémentaires restent possibles, le défi étant la performance ultime de navigation inertielle au nautique par mois, qui correspond à une stabilité de dérive de  . Cet article offre aussi l'opportunité de rappeler le contexte historique de l'expérience de Sagnac, qui est à l'origine de tous les gyros optiques.

The full text of this article is available in PDF format.

Keywords : Fiber-optic gyroscope, Ring-laser gyroscope, Sagnac effect, Inertial navigation

Mots-clés : Gyromètre à fibre optique, Gyromètre laser, Effet Sagnac, Navigation inertielle

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