US 10,378,971 B2Granted

Temperature sensor

AssigneesUniversite de Mons, Emphase SPRL

InventorsFrédéric Musin, Marc Wuilpart, Patrice Megret

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Abstract

The present invention is related to a method for determining distributed temperature variation of a few mode optical fiber comprising the steps of:—providing a few mode optical fiber;—enlighting a first end of said few mode optical fiber by means of a coherent light source;—determining the interference pattern of coherent light at a second end of the optical fiber;—selecting one maximum of intensity at the second end of the optical fiber by spatially filtering the enlighting at the first end of the optical fiber;—determining the path length of the trajectory of the selected maximum of intensity;—based upon the determined path length of the trajectory of the selected maximum of intensity, determining the temperature variation of the few mode optical fiber.

Claims12

Dependent claims

Method for determining an average distributed temperature variation of a few mode optical fibre comprising the steps of:

providing a few mode optical fibre;
enlighting a first end of said few mode optical fibre by means of a coherent light source;
determining the intermodal interference pattern of coherent light at a second end of the optical fibre;
selecting one maximum of intensity of the intermodal interference pattern at the second end of the optical fibre by spatially mode filtering the enlighting at the first end of the optical fibre;
determining the path length of the trajectory of the selected maximum of intensity of the intermodal interference pattern;
based upon the determined path length of the trajectory of the selected maximum of intensity, determining the average distributed temperature variation of the few mode optical fibre.

3 more elements

Dependencies are inferred from the claim text.