Improved reversible, low cost, distributed optical fiber...

G - Physics – 01 – N

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G01N 21/77 (2006.01) G02B 6/25 (2006.01) G02B 6/26 (2006.01) G02B 6/30 (2006.01) G02B 6/34 (2006.01) G02B 6/42 (2006.01)

Patent

CA 2611795

A spectroscopic based optical fiber sensor includes a sensitive optical fiber, a probing light source, a power supply, a detector means, a signal processing means, and a display means. The sensitive optical fiber has a core and a cladding - said cladding has at least one sensitive region which is optically affected by the presence of at least one measurand. The probing light source, adjacent to the sensitive fiber, transversely illuminates the fiber at said sensitive region from the outside. The probing light is modified by the sensitive fiber, coupled into the optical fiber core, either as bound modes or leaky modes, as a light signal and guided to a detector means located at the terminus of the optical fiber. The detector means correlates the intensity of the light signal with an electric signal and transmits the electric signal to the signal processing means, wherein the electric signal is correlated to the quantity being measured. The correlated quantity being transmitted and displayed on the display means.

L~invention concerne un capteur à fibre optique de type spectroscopique comprenant une fibre optique sensible, une source lumineuse d~exploration, une unité d~alimentation, un détecteur, un moyen de traitement de signal et un moyen d~affichage. La fibre optique sensible possède un cAEur et une gaine, ladite gaine présentant au moins une zone sensible qui subit un effet optique par la présence d~au moins une mesurande. La source lumineuse d~exploration, adjacente à la fibre sensible, éclaire de manière transversale la fibre sur la zone sensible par l~extérieur. La lumière d~exploration est modifiée par la fibre sensible, couplée dans le cAEur, en mode guidé ou en mode tunnel, sous forme de signal lumineux et guidée vers un détecteur situé à l~extrémité de la fibre optique. Le détecteur met en corrélation l~intensité du signal lumineux avec un signal électrique et transmet ce dernier au moyen de traitement de signal, qui met en corrélation le signal électrique à la quantité mesurée. La quantité corrélée est transmise au moyen d~affichage et affichée.

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