| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring the surface temperature of a steel product for more accurately measuring the surface temperature than before even when its surface state substantially changes. SOLUTION: At measurement on the surface temperature of the steel product in a heating furnace through the use of a radiation thermometer via a through hole provided in a furnace wall, the surface of the steel product is simultaneously irradiated with light via another through hole to acquire its reflected image and measure the rate of change in the quantity of light. From the relation between the rate of change in the quantity of light and emissivity previously determined on the same type of steel product, a corresponding surface emissivity of the steel product at the temperature measurement is determined from a measurement value on the rate of change in the quantity of light. Temperature measured by the radiation thermometer is corrected by the determined emissivity. The steel product is preferably silicon steel containing silicon 3 mass% or more. COPYRIGHT: (C)2004,JPO
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