Fiber optic temperature sensing

Details Fiber optic temperature sensing Fiber optic temperature sensing

G - Physics

05

D

342/14, 341/31,

G05D 23/00 (2006.01) G01J 5/00 (2006.01) G01K 3/00 (2006.01) G01K 11/32 (2006.01) G01M 3/00 (2006.01) G01M 3/04 (2006.01)

Patent

CA 1171502

RAYCHEM CORPORATION MP0722/723 ABSTRACT CONTROLLING TEMPERATURE WITH FIBER OPTICS Method and apparatus for controlling temperature of a material by means of an optical waveguide having a core and cladding, the refractive index. of the core becoming lower than that of the cladding to induce blackout of light transmission at pre-selected temperatures. The material is heated or cooled as indicated by the change in light trans- mission at or near the blackout temperature, which pheno- menon can also be used to detect the presence or level of a material. New waveguides comprising several sections having different blackout temperatures are provided. (Fig. 12)

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