102 Measurement of Total Hemispherical Emittance of Glass Sheets by Transient Calorimetric Technique

Abstract

By an improved transient calorimetric technique, total hemispherical emittance ε_h of glass sheets of borosilicate and fused silica has been measured. The temperature inside the glass-sheet specimen by the technique is analyzed, and it is confirmed that the effect of the temperature distribution inside the specimen on the measured ε_h is very little. Local total emittance ε_h on the specimen surface is also analytically obtained, and the effect of ε_h on the measured ε_h is examined.