Method and apparatus for determining peak temperature along an o

Details Method and apparatus for determining peak temperature along an o Method and apparatus for determining peak temperature along an o

1982-07-29

1985-05-07

McGraw, Vincent P.

Optics: measuring and testing

Optical pyrometers

With sample engaging rod or tube

374161, G01J 508, G01J 528

Patent

active

045154740

ABSTRACT:
The invention relates to a new method and new apparatus for determining the hottest temperature or the coldest temperature prevailing along the length of an optical-fiber light guide. The invention is conducted with an optical fiber capable of supporting multidiode propagation of light and comprising a core, a cladding, and a jacket. The core is selected to have (1) a higher refractive index than the core and the cladding and (2) a relatively high negative temperature coefficient of refractive index. A light beam capable of establishing substantially single-mode propagation in the core is launched into an end thereof at an angle to the axis. The angle is increased to effect the onset of light refraction from the core into the cladding. The value of the launch angle corresponding to the onset is determined and then used to establish the refractive index of the core corresponding to the onset angle. The maximum temperature prevailing along the fiber then is determined from the (1) refractive index so determined and (2) the temperature coefficient of refractive index for the core. The invention is based on the finding that the launch angle corresponding to the onset of refraction into the cladding is uniquely determined by the maximum value of the ratio of the core refractive index to the cladding refractive index, which maximum occurs at the hottest point along the fiber.

REFERENCES:
patent: 4295739 (1981-10-01), Meltz et al.
patent: 4316388 (1982-02-01), Miller et al.
patent: 4354735 (1982-10-01), Stowe et al.
patent: 4417782 (1983-11-01), Clarke et al.
Gottlieb et al., "Measurement of Temperature with Optical Fibers", ISA Transactions, vol. 19, No. 4, pp. 55-63 (1980).

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