Distributed and spatially averaged fiber optic temperature senso

Details Distributed and spatially averaged fiber optic temperature senso Distributed and spatially averaged fiber optic temperature senso

1994-09-13

1996-03-12

Healy, Brian

Optical waveguides

Optical fiber waveguide with cladding

385 12, 385 13, 385126, 385127, 359115, 359124, 356319, 356320, 356432, 356445, 25022711, 25022714, 25022718, 25022723, 25022722, G02B 602, H04J 1400, G01J 342, H01J 516

Patent

active

054993130

ABSTRACT:
Methods and devices for sensing temperature changes at a plurality of locations use a light-transmitting optical fiber system along a path including said locations, said optical fiber system having a first end and a second end and a sensing element of said locations, each sensing element being so characterized that, when exposed to the temperature changes to be sensed and transmitting interrogating light of suitable wavelength or wavelengths .lambda..sub.v and an intensity P.sub.o, it converts a fraction .alpha.P.sub.o of the intensity of said interrogating light into a light separable from the interrogating light, at least part of the intensity of which is emitted from at least one of said two ends of the probe at wavelengths .lambda..sub.f different from .lambda..sub.v, where .alpha. is a temperature-dependent fraction smaller than unity, the value of which increases with increasing temperature within a temperature range, the intensity of said light of wavelengths .lambda..sub.f being substantially proportional to the value of .alpha.. The system can be used to sense the temperature distribution among the different locations, or to provide the spatially averaged temperature along the optical fiber system.

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