Simultaneous Measurement of Specitic Heat and Total Hemispherical Emissivity of Metals by the Transient Calorimetric Technique

Abstract

A new principle for performing a simultaneous measurement of the specific heat, c, and the total hemispherical emissivity, ε_h, of metals is proposed. The measuring technique used is not the resistive self-heating method by electric current, but essentially the transient calorimetric method which is usually used only for measuring the ε_h. On this principle, two kinds of specimens need to be prepared; one is a specimen made of the material to be measured, and another is a compound specimen made of the above-mentioned material and a standard one. From the experimental results for these two specimens, the c and the ε_h values can be determined simultaneously. Constantan and copper were selected, respectively, as the test material and the standard, and measurements were performed in the range of 380-720K. The method appears suitable for performing a simultaneous measurement of c and ε_h of metals, particularly for measuring ε_h of alloys of which the specific heat data are lacking.