Dynamically enhanced fiber optic accelerometer

G - Physics – 01 – P

Patent

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Details

G01P 15/03 (2006.01) G01P 15/00 (2006.01) G01P 15/093 (2006.01)

Patent

CA 2415445

A fiber optic particle motion accelerometer has a housing with a mid-section mounted therein such that the mid-section flexes in response to acceleration along a sensing axis. A proof mass is mounted to an outer edge of the mid- section. A first spiral-wound optical fiber coil is mounted to a first side of the mid-section and a second spiral-wound optical fiber coil is mounted to a second side of the mid-section. A first hinge is formed in the mid-section adjacent the mounting of the mid-section in the housing, and a second hinge is formed in the mid-section between the proof mass and the first and second fiber optic coils. The optical fiber coils are included in an outerferometer such that acceleration along the sensing axis produces a phase difference between optical signals propagating in the optical fiber coils.

L'invention concerne un accéléromètre à mouvement particulaire dynamiquement amélioré par fibre optique, comprenant un logement présentant une section centrale montée dans le logement de telle sorte que ladite section centrale fléchisse en réaction à une accélération le long d'un axe de détection. Un premier enroulement de fibre optique spiralé est monté sur un premier côté de la section centrale et un second enroulement de fibre optique spiralé est monté sur un second côté de la section centrale. Une première articulation est ménagée dans la section centrale adjacente au montage de la section centrale dans le logement, et une seconde articulation est formée dans la section centrale entre la masse étalon et les premier et second enroulements de fibre optique. Les enroulements de fibre optique sont contenus dans un interféromètre, de telle sorte que l'accélération le long de l'axe de détection produise une différence de phase entre les signaux optiques se propageant dans les enroulements de fibre optique.

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