The Novel Heating Method For The Sample Of Speetral Emissivity Measurement

Emissivity as a major thermal parameter is a physical quantities which reflects the thermal radiation ability of the surface. From the definition of the emissivity we know, the accurate measurement of the sample's surface temperature is one of the key for the emissivity measurement. The heat flow between the contact thermometry of the measuring point and the sample surface is the key factor affecting the level of the measurement temperature. In order to eliminate the temperature difference between center measurement points and surface temperature of the material samples with low thermal conductivity, based on the device which has been established by China Institute of Metrology, this paper improves the heating system and introduces a new hot airflow double-sided heating method for sample, The heating methods used were oxidation of higher thermal conductivity and low thermal conductivity of stainless steel materials, insulation materials tentative spectral emissivity measurements. Described using the original system and new hot air heating heating measurements of spectral emissivity effects, and in both the heating mode of the two samples were, respectively, the results of comparative analysis. Rapid heating and cooling the new method, not the characteristics of the sample shape restrictions, and describes its principle, application, and the impact of the existing and novel methods on the measurement results of spectral emissivity. Also, we analyse and compare the results of two different samples obtained with these two heating methods. The new method for material samples with low thermal conductivity has outstanding advantages and potential applications.