Multiple-point temperature sensor using optic fibers

Details Multiple-point temperature sensor using optic fibers Multiple-point temperature sensor using optic fibers

G - Physics

01

K

73/52

G01K 11/00 (2006.01) G01D 5/34 (2006.01) G01K 11/32 (2006.01)

Patent

CA 1323504

ABSTRACT OF THE DISCLOSURE A multiple-point temperature sensor, with optic fibers, uses the effect of variation in the birefringence in a birefringent optic fiber as a function of temperature. This sensor has a plane polarized, wide spectrum source coupled to a monomode optic fiber for preservation of polarization, along one of the neutral axes, with weak coupling points distributed along this fiber. A polarizer at 45° to the neutral axes of the fiber is placed at the output of this sensing fiber. The output radiation is analyzed by spectroscopy, for example in a Michelson interferometer, capable of being swept, associated with a detector. The interferometer shifts needed to detect the extreme values of the transmission function are measurements of temperature deviations.

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