Fiber optic sensors with reduced noise

G - Physics – 01 – D

Patent

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Details

G01D 5/26 (2006.01) G01B 9/02 (2006.01) G01C 19/72 (2006.01) G01L 11/02 (2006.01) G02B 6/26 (2006.01)

Patent

CA 2437841

Hollow-core photonic-bandgap fiber is used in fiber optic Sagnac interferometers, including but not limited to fiber optic gyroscopes. Use of the hollow-core photonic-bandgap fiber reduces Rayleigh backscattering and Kerr effects, which otherwise would introduce phase shift into light propagating through the optical fiber and result in errors in the output of the interferometer. Narrowband light sources, such as semiconductor lasers currently employed for telecommunication applications, which provide increased wavelength stability, as well as broadband light sources, can be used to drive the fiber optic interferometers. Modulation can also be employed to improve the accuracy of the output of these sensors.

On utilise la fibre de structure de bande photonique à âme alvéolée dans les interféromètres de Sagnac à fibres optiques, notamment les gyroscopes à fibres optiques. L'utilisation de la fibre de structure de bande photonique à âme alvéolée réduit la rétrodiffusion de Rayleigh et les effets de Kerr, qui autrement introduiraient un décalage dans la lumière qui se propage à travers la fibre optique et entraîneraient des erreurs dans la sortie de l'interféromètre. Les sources de lumière à bande étroite, comme les lasers à semi-conducteur actuellement utilisés pour les applications de télécommunication, qui assurent une stabilité de longueur d'onde accrue, ainsi que les sources de lumière à large bande, peuvent servir à entraîner les interféromètres à fibres optiques. Il est également possible d'utiliser la modulation pour améliorer l'exactitude de la sortie de ces capteurs.

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