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High-resolution spectral reflection measurements on selected optical-black baffle coatings in the 5-20 μm region

The high-resolution (4 cm1) spectral characteristics of radiation specularly reflected and diffusely scattered from selected optical-black coatings in the infrared from 5 to 20 microns are reported. Various one-, two- and three-coat samples were measured for numerous combinations of incident and output angles. Many spectra show a surprising number of strong, sharp features, especially in the specular direction. The results for several commercially available and widely used black coatings are compared and interpreted.