Abstract
When measuring the normal emissivity of materials, it is assumed that the radiation flux density on the surface of the test material and in the blackbody model for the corresponding surface is uniformly distributed. However, because of the design features of the heaters of the test material and blackbody model, this assumption is not always valid. This article proposes a methodology for measuring the radiation power of the surface of a test material and the corresponding blackbody model, exhibiting a uniform radiation flux density in the surface central region. The feasibility of measuring the radiation power of a surface with a uniform radiation flux density was experimentally confirmed on an alumina sample at a temperature of 1195 K.
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