| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a temperature measuring apparatus by a method wherein a surface temperature in a first region is calculated by using a heat capacity, by using a flow rate of a fluid coming into contact with a second region per unit time and a heat capacity and by using the difference in a surface temperature, between the first region and the second region, which is found by the function of the temperature of the fluid. SOLUTION: An infrared sensor 2 whose visual field is a first region and an infrared sensor 3 whose visual field is a second region are installed at the upper part of a steel sheet 1. Air which flows in a pipe 5 from a blower 4 is blown from a blowoff port 8. The air is set at a preset temperature by an air heater 6 and an air cooler 7, and the air is blown at a prescribed flow rate. Its temperature is detected by a temperature sensor 9, it is fed back to a surface-temperature computing unit 10a, and the temperature of the air in the pipe 5 is controlled. A quantity of radiation infrared light detected by the sensors 2, 3 and the temperature of the air are input sequentially to the computing unit 10a. The black-body radiance, the emissivity and the stray noise influence coefficient of the steel sheet 1 as well as the emissivity and the environmental temperature of a peripheral object are given to the computing unit 10a in advance. Then, the influence of a stray noise is removed on the basis of the difference in a surface temperature between the first region and the second region.
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