Data in the literature on the spectral emissivity of carbon and graphite show a great divergence, ranging from 0.75 to 0.99 in the visible region. A new determination has been undertaken at a number of wavelengths using an integrating sphere and modulated light. Emissivities ranging from 0.99 in the visible to 0.96 at 0.28 μ and 1.7 μ have been found for several different graphite anodes; the values for lampblack anodes are about 0.005 lower. There is a good agreement with the highest values thus far published. Most of the literature data on the spectral radiance of the anode are consistent with the emissivities found by the present author.
© 1968 Optical Society of America
Original Manuscript: August 15, 1967
Published: March 1, 1968
K. Schurer, "The Spectral Emissivity of the Anode of a Carbon Arc," Appl. Opt. 7, 461-465 (1968)