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A detailed experimental study has been carried out to examine the influence of surface roughness conditions on the reflection characteristics of metal surfaces for monochromatic thermal radiation. Surfaces used were prepared by standard optical grinding techniques using a range of sizes of grit of the grinding compounds. Various definitions of reflectances are presented to facilitate in the discussion of the results. Biangular, specular, and hemispherical-angular reflectance measurements are discussed in terms of the optical root-mean-square surface roughness, wavelength of reflected radiation, and surface material. The experimental results are compared with the available predictions from theoretical analysis.
Birkebak et al. (Mon,) studied this question.