Total hemispherical emissivities of copper, aluminum, and silver

Ramanathan, K. G. ; Yen, S. H. ; Estalote, E. A. (1977) Total hemispherical emissivities of copper, aluminum, and silver Applied Optics, 16 (11). pp. 2810-2817. ISSN 0003-6935

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The temperature variation of the total hemispherical emissivities of Cu, Al, and Ag has been studied by using a temperature decay method in the 150-1000-K range. The results obtained are found to support, for the first time, a classical relaxation theory developed by Parker and Abbott. The experimental emissivity data are used to calculate the emissive relaxation times t for Cu, Al, and Ag at various temperatures in this range. These t values are found to be practically insensitive to temperature, a behavior contrary to that shown by the electrical relaxation times calculated from the resistivity vs temperature data of these metals.

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