| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature-measuring part, a heating furnace using the part, and a furnace temperature control method capable of measuring the furnace temperature without fouling, a precursor for optical fiber manufacture to be subjected to heat treatment by metallic components. SOLUTION: This temperature-measuring parts 43, 45 is provided insertably and drawably in a furnace tube 13 of the heating furnace 11 for performing heat treatment of the precursor for optical fiber manufacture. The temperature measuring parts 43, 45 have a constitution, wherein the periphery of a thermocouple 53 is covered with a carbon protection tube 57, and a control means 27 for controlling the operations of heaters 15a, 15b, 15c encircling the furnace tube 13 corrects operation control of the heaters 15a, 15b, 15c based on the temperature in the furnace tube 13 detected by the temperature measuring parts 43, 45. COPYRIGHT: (C)2005,JPO&NCIPI |
