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Machine translation
1. (WO1981003070) METHOD OF OBSERVING THE CORE REGION OF OPTICAL FIBERS AND PREFORMS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003070    International Application No.:    PCT/US1981/000294
Publication Date: 29.10.1981 International Filing Date: 10.03.1981
IPC:
C03B 37/025 (2006.01), C03B 37/03 (2006.01), G01B 11/10 (2006.01)
Applicants:
Inventors:
Priority Data:
140313 14.04.1980 US
Title (EN) METHOD OF OBSERVING THE CORE REGION OF OPTICAL FIBERS AND PREFORMS
(FR) PROCEDE D'OBSERVATION DE LA REGION DU NOYAU DES FIBRES OPTIQUES ET DES EBAUCHES
Abstract: front page image
(EN)Method of observing the core region (11) of-optical fibers (10) and fiber preforms 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.
(FR)Procede d'observation de la region du noyau (11) des fibres optiques (10) et des ebauches de fibres consistant a induire la fluorescence dans au moins un des dopants modifiant l'indice presents dans le noyau, a observer en eclairant la fibre/ebauche avec une radiation a la longueur d'onde de crete d'absorption pour ce dopant, et a observer la region comprise entre les bords fluorescents de la fibre/ ebauche. Le diametre du noyau peut etre determine en mesurant la distance entre ces bords. Cette technique peut etre utilisee pour commander la vitesse de traction de fibres pendant la fabrication.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)