TEMPERATURE MEASURING METHOD AND DEVICE FOR MOLTEN METAL AND METAL PIPE-COVERED OPTICAL FIBER USED FOR THIS METHOD AND DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately measure the temperature and level of a high-temperature molten metal at a low cost. SOLUTION: The tip section of an optical fiber 11 is inserted into a molten metal together with a metal pipe 12 covering the optical fiber 11. The light emitted from the tip section of the optical fiber 11 is guided to a radiation thermometer 3 through the optical fiber 11, and the temperature of the molten metal is detected. The level of the molten metal is judged, based on the feed quantity of the optical fiber 11 and the temperature change measured by the radiation thermometer 3.