| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of determining the distribution of refractive indexes of a glass preform by which the quality is reliably guaranteed only with a few points of measurement. SOLUTION: A glass preform is obtained by vitrifying a glass particulate deposit by heat to obtain transparent glass. The method of determining the distribution of refractive indexes of a glass preform is characterized in that the distribution of the refractive indexes is determined on the glass preform after the vitrification step at the positions corresponding to the maximum and minimum points of the temperature distribution in the central axis direction of the glass particulate deposit. COPYRIGHT: (C)2009,JPO&INPIT
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