| 摘要 |
PURPOSE:To obtain an accurate emissivity measuring instruments by connecting the cooling layer of an airtight structure airtightly with the opening part of a blackbody furnace having airtight structure. CONSTITUTION:A front cover 25 is closed and the insides of the furnace body 11 and the cooling layer 20 are maintained airtightly and at the same time, a bar- shaped member 28 setting a sample 2 at an end is operated to locate the sample 2 at the bottom side A of the furnace. Then, after the insides of the furnace body 11 and the cooling layer 20 are evacuated of purged with a specified gas atmosphere via a pierced hole 23, a heater 5 is controlled to heat the furnace body 11 and heat the sample 2 to the prescribed temperature. On the other hand, the cooling layer 20 is usually water-cooled but water-cooling is unnecessary when the measuring temperature is high and the emissivity of the sample 2 is high. Further, when the temperature is low and water-cooling is not available, the temperature of the cooling layer 20 is measured and an amount contributed by the background radiation is corrected. Thus, the accurate radioactivitiy is measured. |
