High-temperature emissivities of copper, aluminum, and silver

Ramanathan, K. G. ; Yen, S. H. (1977) High-temperature emissivities of copper, aluminum, and silver Journal of the Optical Society of America, 67 (1). pp. 32-38. ISSN 0030-3941

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Official URL: http://www.opticsinfobase.org/josa/abstract.cfm?UR...

Related URL: http://dx.doi.org/10.1364/JOSA.67.000032


Using a transient calorimetric technique, the total hemispherical emissivities εh of very pure copper, aluminum, and silver have been measured at various temperatures in the range 335-1100°K. By carrying out measurements on a sphere, a thin circular disk, and a thin square plate all made of the same copper sample, it is shown that the measured εh is practically independent of the shape of the specimen. Measured εh values of Cu, Al, and Ag show considerable departure from the theoretical predictions of Davisson and Weeks and the data of previous investigators. εh data are presented in tabular form at 20°K intervals for all three materials in the range 400-1000°K.

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