A fabry-perot sensing element based on a large-diameter...

G - Physics – 01 – L

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G01L 1/04 (2006.01) G01D 5/26 (2006.01) G01K 5/58 (2006.01) G01L 1/24 (2006.01) G01L 7/02 (2006.01) G01L 11/02 (2006.01) G02B 5/18 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2451100

An optical sensing device including a force-applying assembly for providing a force and a Fabry-Perot (FP) element including a large-diameter waveguide having a core and having a cavity in line with the core, the cavity having reflective surfaces and having an optical path length related to the distance between the reflective surfaces, the FP element being coupled to the force so that the optical path length changes according to the force, the FP element for providing an output optical signal containing information about a parameter that relates to the force. Sometimes the large-diameter waveguide is formed by collapsing a glass tube, having a bore and having an outer diameter of about one millimeter, onto a pair of optical fibers arranged in tandem in the bore and separated by a predetermined distance, and respective end faces of the optical fibers form the cavity and are coated with a wholly or partially reflective material.

L'invention concerne un dispositif de détection optique comprenant un ensemble d'application de force et un élément de Fabry-Pérot à guide d'ondes de diamètre important. Le guide d'ondes comprend une partie centrale et une cavité alignée sur cette partie. La cavité présente des surfaces réfléchissantes et une longueur de trajet optique liée à la distance entre les surfaces réfléchissantes. L'élément de Fabry-Pérot est couplé à la force engendrée par l'ensemble d'application de force, si bien que la longueur de trajet optique varie en fonction de la force. Ledit élément fournit un signal optique de sortie contenant des informations relatives à un paramètre correspondant à la force. On peut éventuellement former le guide d'ondes en renversant un tube de verre creux (de diamètre extérieur mesurant environ un millimètre) sur une paire de fibres optiques disposées en tandem à l'intérieur du tube et espacées selon une distance préétablie. Les faces terminales respectives des fibres optiques constituent la cavité et sont revêtues de matériau entièrement ou partiellement réfléchissant.

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