Method and apparatus for measuring acceleration using a...

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G01P 15/08 (2006.01) G01H 9/00 (2006.01) G01P 15/093 (2006.01) G01V 1/18 (2006.01)

Patent

CA 2501699

A system and method for measuing acceleration using a fiber optic accelerometer having a pair of fiber optic coils positioned around a deformable support structure. The support structure possesses a nominally cylindrical shape with the fiber optic coils being wound around opposite ends of the cylindrical support structure from each other. The support structure deforms from its nominally cyclindrical shape to a conical shape in response to acceleration along a sensing axis. The changing shape of the support structure causes one of the fiber optic coils to expand while the other of the fiber optic coils contracts. The fiber optic coils are included in an interferometer such that acceleration along the sensing axis produces a phase difference between light signals propagating in the fiber optic coils resulting from their expansion and contraction.

L'invention concerne un système et un procédé de mesure de l'accélération au moyen d'un accéléromètre à fibres optiques ayant une paire de bobines de fibres optiques positionnées autour d'une structure support déformable. La structure support présente une forme générale cylindrique, les bobines de fibres optiques étant enroulées autour des extrémités opposées de la structure support cylindrique. La structure support cylindrique se déforme pour prendre une forme conique, en réponse à une accélération le long d'un axe de détection. Le changement de forme de la structure support a pour effet que l'une des bobines de fibres optiques se déploie, tandis que l'autre se contracte. Les bobines de fibres optiques sont montées dans un interféromètre, de telle façon que l'accélération le long de l'axe de détection produise une différence de phase entre des signaux lumineux se propageant dans les bobines de fibres optiques, consécutivement à leur déploiement et à leur contraction.

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