iXBlue celebrating the 40th anniversary of the Fiber Optic Gyroscope!

April 18th, 2016

From 17 to 21 April, iXBlue is participating in the world conference dedicated to Fiber Optic sensors and applications. On this occasion, Hervé Lefèvre, iXBlue’s Chief Scientific Officer, will chair a session about the FOG technology and how fascinating it is!




Baltimore Convention Center

Baltimore, Maryland, United States


Hervé Lefèvre, iXBlue’s Chief Scientific Officer : "This 40th anniversary is the opportunity to share my fascination for the fiber optic gyro ant its potential perfection. The term serendipity was used very early to describe it. The first example was the proper frequency which allows one to get a perfect biasing with imperfect components.

Second one on the list, and may be the main one, is the non linear Kerr effect that ‘’vanishes away’’ with a broadband source. You can add technological serendipity : a proton-exchanged lithium niobate waveguide is a quasi-ideal polarizer, and erbium-doped fiber amplification technology yields a quasi-ideal source. The result is a device that can get a continuously decreasing Allan deviation over many days of integration time, which is absolutely unique compared to all the other kinds of inertial sensors. It makes possible the dream of an inertial navigation system with an accuracy of a nautical mile over a month !

This presentation will be also the opportunity to present a ‘’pot pourri’' of comments about various important points which should be outlined :

- the contribution of Max von Laue to an effect which should be renamed Sagnac-Laue effect ;

- how amazing is the digital phase ramp simply because ''the mean of a difference is the difference of the means’’ ;

- how powerful is the test of path-matched white light interferometry which could be renamed channelled spectrum analysis ;

- and to conclude, some comments about the Shupe effect and the fact that thermal stress in the sensing coil can be simply understood, and in any case, better understood than with the numerous papers using finite element analysis that you can find in the literature."

Read more about the conferences on SPIE website