| 摘要 |
PURPOSE:To measure internal temperature accurately over the entire length of a steel tube in a furnace by making a scan on the internal surface of the steel tube in the furnace and measuring the temperature by a scanning type radiation thermometer to its overall lengthwise length, and obtaining the lengthwise temperature distribution of the tube from measured values of temperature. CONSTITUTION:The radiation thermometer 10 is so installed as to scan the internal surface from the close tube end 1a of the steel tube 1 to the distant tube end 1b through an observation hole 4 made in the wall of the furnace 5. Then, a nonreflective, nonradiative member 19 is provided on the wall of the furnace 5 on the opposite side from the distant tube end 1b of the steel tube 1 to prevent radiant energy from inside the furnace 5 from reaching the thermometer 10 through the inside of the steel tube 1 from the distant tube end 1b of the steel tube 1. Thus, the thermometer 10 makes a scan between a nearly horizontal direction and a direction indicating the close tube end 1a of the steel tube 1. When the scanning position reaches the internal surface of the tube end 1b, an abrupt change point of incident energy to the thermometer 10 is detected by a tube end detecting circuit 17 to find the position of the tube end 1a of the steel tube 1 from the change point. This position is regarded as a reference position to obtain the lengthwise temperature measurement point of the tube and its temperature distribution.
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