Radiant energy – Luminophor irradiation – Methods
Patent
1980-04-14
1981-12-22
Willis, Davis L.
Radiant energy
Luminophor irradiation
Methods
250461R, G01N 2164
Patent
active
043072968
ABSTRACT:
A method of observing the core region of optical fibers and fiber preforms is disclosed comprising the step of inducing fluorescence in at least one of the index-modifying dopants present in the core being observed by illuminating said fiber/preform with radiation at the peak absorption wavelength for said dopant, and observing the region between the fluorescing edges of said fiber/preform. The core diameter can be determined by measuring the distance between said edges. This technique can be utilized to control the fiber pulling rate during fabrication.
REFERENCES:
patent: 3879128 (1975-04-01), Presby
patent: 4161656 (1979-07-01), Marcuse et al.
Bell Telephone Laboratories Incorporated
Sherman Sylvan
Willis Davis L.
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