Non-intrusive fiber optic pressure sensor for measuring...

G - Physics – 01 – L

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G01L 11/02 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2335469

Non-intrusive pressure sensors (14-18) for measuring unsteady pressures within a pipe (12) include an optical fiber (10) wrapped in coils (20-24) around the circumference of the pipe (12). The length or change in the length of the coils (20-24) is indicative of the unsteady pressure in the pipe. Bragg gratings (310-324) impressed in the fiber (10) may be used having reflection wavelength A that relate to the unsteady pressure in the pipe. One or more of sensors (14-18) may be axially distributed along the fiber (10) using wavelength division multiplexing and/or time division multiplexing.

La présente invention concerne des capteurs de pression (14-18) non intrusifs destinés à mesurer des pressions non stationnaires à l'intérieur d'une canalisation (12) qui comprennent une fibre optique (10) enroulée en spires (20-24) autour de la circonférence de la canalisation (12). La longueur ou le changement de longueur des spires (20-24) est indicative d'une pression non stationnaire dans la canalisation. On peut utiliser des réseaux de Braggs (310-324) imprimés dans la fibre (10) présentant des longueurs d'ondes de réflexion lambda qui se rapportent à la pression non stationnaire dans la canalisation. Un ou plusieurs capteurs (14-18) peuvent être axialement distribués le long de la fibre (10) au moyen de multiplexage à division de longueur d'onde et/ou de multiplexage à division temporelle.

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