To provide an apparatus for manufacturing an optical fiber preform, which has a simple structure and can obtain accurate positional information of a porous preform in a muffle and suppress damage of the muffle caused when the porous preform comes in contact with the muffle, and to provide a method for manufacturing the optical fiber preform.
In the apparatus, the optical fiber preform is manufactured by inserting the porus preform 1 into the muffle 2 of a sintering furnace, subsequently dehydrating and sintering the porous preform 1. The apparatus is equipped with a radiation thermometer 11 which detects the existence of the porous preform 1 at a prescribed area 9 by measuring the temperature of the prescribed area 9 in the muffle 2, as a means for detecting expansion of the porous preform 1.
HASEGAWA NORITO
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Tadashi Takahashi
Takashi Watanabe