| 摘要 |
PURPOSE:To realize the axial symmetry and to apply the enumeration formula of the thermal diffusivity in which an axial symmetry is presumed by rotating a sample in the infrared rays image furnace. CONSTITUTION:A sample 8 is cylindrical, and provided with the sheath type alumel chromel thermocouples 13-15, two pieces in the interior, one piece on the side surface and three pieces in total. The sample is place on a sample stand 12, the stand is fixed at a rotary shaft 22 held vertically by a bearing 18, and therefore, by the belt bridged between belt pulleys 19 and 20 which are not shown in the figure, the sample can be rotated by a motor 21. An infrared rays image furnace 9 corrects the edge surface in the upward and downward directions with thermal reflecting plates 11 and 16. By the output of the thermocouple 13, the infrared rays image furnace 9 is PID-controlled, a sample side surface is made into the prescribed temperature, and the output of the temperature difference of the thermocouples 14 and 15 at that time is recorded, thereby the thermal diffusivity is obtained. |
