High spatial resolution distributed temperature sensing system

G - Physics – 01 – D

Patent

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G01D 5/353 (2006.01) G01K 11/32 (2006.01) G01L 1/24 (2006.01)

Patent

CA 2696782

A system and a method that are useful for making temperature measurements that are distributed over a distance. In one aspect, the system comprises a plurality of Bragg grating measurement points disposed in an optical fiber with a predetermined spacing between adjacent Bragg grating measurement points. The system also comprises a substrate with the optical fiber disposed thereon, the optical fiber wrapped around the substrate with at least one predetermined wrap angle. The predetermined wrap angle and the predetermined spacing may be selected to allow a temperature measurement signal to be distinguished from a bending measurement signal. The substrate may have a first coefficient of thermal expansion greater than a second coefficient of thermal expansion of the optical fiber and may comprise alternating sections of hollow tube and solid rod.

L'invention concerne un système et un procédé permettant de réaliser des mesures de température réparties sur une distance. Dans un aspect, le système comprend plusieurs points de mesure à réseau de Bragg disposés dans une fibre optique et séparés les uns des autres par une distance prédéterminée. Le système comprend également un substrat sur lequel la fibre optique est disposée, la fibre optique étant enroulée autour du substrat avec au moins un angle d'enroulement prédéterminé. L'angle d'enroulement prédéterminé et la distance prédéterminée peuvent être choisis de manière à faire la distinction entre un signal de mesure de température et un signal de mesure d'inclinaison. Le coefficient de dilatation thermique du substrat peut être supérieur au coefficient de dilatation thermique de la fibre optique, et le substrat peut comprendre des sections de tube creux et de tige solide en alternance.

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