| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing an optical fiber preform in which one can accurately know the weight, the volume and the density of deposited soot at any time in the production process, and can take measures against the inferior deposition state or the like by knowing the state or the like at early time of the process progress. SOLUTION: The method and the apparatus for producing an optical fiber preform, which is an outside vapor phase deposition method and which is characterized in that one can know the weight of the deposited soot for optional number of layers of soot deposited on the optical fiber preform 1 during the optional number of one-way strokes of the traverse of the burner 5, by the change amount of measured value of the weight detector 6 at starting point and ending point of elapsed time during the optional number of one-way strokes, in that one can calculate the volume of the deposited soot using the moved distance of the optical fiber preform 1 in the direction to get apart from the burner 5 during the elapsed time, and in that one can calculate the density of the deposited soot for the optional number of layers from the weight value and the volume value of the deposited soot. COPYRIGHT: (C)2006,JPO&NCIPI
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