EMISSIVITY MEASURING APPARATUS AND EMISSIVITY MEASURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an emissivity measuring apparatus to be applicable to a sample which undergoes a change of phase at an emissivity measurement temperature.;SOLUTION: An emissivity measuring apparatus 1 has a heat-up unit 5 in a vacuum case connected to a vacuum pump 3. The heat-up unit 5 has a sample placement board 6, a sample heat-up heater 7, a temperature gradient detection member 8 and a temperature gradient adjusting heater 9 in this order from the top. A sample 4 placed on the sample placement board 6 is heated up to an emissivity measurement temperature by the sample heat-up heater 7. In this moment, the temperature gradient adjusting heater 9 is controlled to cause heat generated by the sample heat-up heater 7 to move to the sample 4 so that the temperature gradient in the vertical direction of the temperature gradient detection member 8 becomes zero. A density of energy emitted by the sample 4 is obtained by dividing an output of the sample heat-up heater 7 by an a surface area of the sample 4 in this state, and an emissivity is calculated on the basis of the energy density, an emissivity of the sample 4 and a relation expression between the surface temperature and the container temperature.;COPYRIGHT: (C)2014,JPO&INPIT