| 摘要 |
PURPOSE:To improve temperature measuring accuracy by dynamically setting the emissivity of a radiation thermometer in accordance with change in an operating condition with the overall heat transfer coefficient of a heat treating furnace obtained from a specific condition by using the temperature of a metal strip measured by the radiation thermometer as a reference. CONSTITUTION:The overall heat transfer coefficient phiCG of a furnace is obtained from a relationship represented by the accompanying expression I by using the temperature TSM of a metal strip 5 indicated by a radiation thermometer 6. When the overall heat transfer coefficient phiCG is equal to an empirically or experimentally determined one, an emissivity epsilon1 set in advance is correct and the temperature TSM of the metal strip 5 represents a correct value. The temperature TS1 of the metal strip 5 is calculated by using the set atmospheric temperature TGO and the overall heat transfer coefficient phiCG of the furnace and an LSD. At this time, the emissivity of the radiation thermometer is changed from epsilon1 to epsilon2 so that the temperature TS1 is made equal to the temperature TSM of the metal strip measured by the radiation thermometer. Thus, temperature measuring accuracy can be improved.
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