Multiple-point temperature sensor using optic fibers
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United States of America Patent
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-
May 22, 1990
Grant Date -
N/A
app pub date -
Jan 24, 1989
filing date -
Jan 25, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.degree. 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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