Fiber optic sensor system and method

G - Physics – 02 – F

Patent

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Details

G02F 1/01 (2006.01) G01D 5/353 (2006.01) G01H 9/00 (2006.01) G02F 1/21 (2006.01)

Patent

CA 2305437

A system for converting an electrical signal to an optical signal for a fiber optic system sensor includes a sensor that produces an electrical signal based upon a parameter being measured. A material that changes dimensions is responsive to an applied electrical signal. The electrical signal is produced by the sensor connected across the material. An optical fiber is coupled to the material such that dimension changes of the material produce strain in the optical fiber. The produced strain is operable to affect light traveling through the optical fiber to produce an optical signal for a fiber optic system. The optical fiber is part of an optical interferometer and strain produced in the optical fiber creates a phase change in the interferometer.

La présente invention concerne un système et un procédé permettant de convertir en signal optique pour système à fibres optiques un signal électrique. Le signal électrique produit par un capteur (10) en fonction d'un paramètre mesuré est connecté sur un matériau (12, 34, 40) dont les dimensions varient sous l'effet d'un signal électrique appliqué. Une fibre optique (14, 30, 38) est couplée au matériau (12, 34, 40), la variation de dimensions du matériau (12, 34, 40) produisant une contrainte sur la fibre optique (14, 30, 38). Cette contrainte permet de modifier la lumière circulant dans la fibre optique (14, 30, 38) de façon à produire un signal optique convenant au système à fibres optiques. Ce capteur (10) peut être un géophone ou un hydrophone. Le matériau (12, 34, 40) à variation de dimensions peut être un cylindre de céramique piézo-électrique, un film PVDF (fluorure de polyvinylidène), ou tout autre matériau piézo-polymère.

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