Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-01-24
1990-05-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022724, 25022731, 356345, 356346, H01J 516, H01J 4014
Patent
active
049280058
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.
REFERENCES:
patent: 4699513 (1987-10-01), Brooks et al.
patent: 4861979 (1989-08-01), Tardy et al.
patent: 4867565 (1989-09-01), Legnime
Electronics Letters, vol. 21, No. 4, Feb. 14, 1985, pp. 148-149, Stevenage, Herts, GB; M. Courke et al.
Journal of Lightwave Technology, vol. LT-5, No. 7, Jul. 1987, pp. 932-940, IEEE, New York, N.Y., U.S.; I. Sakai et al.
Bettini Jean-Pierre
Botti Serge
Lefevre Herve
Turpin Marc
"Thomson-CSF"
Beck George C.
Nelms David C.
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