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An ideal coating for a radiometric detector should have a low reflectance which is independent of wavelength and of angle. These properties have been investigated using specially developed equipment. A diffuse reflectometer/transmissometer at NPL has been designed to determine the spectral variation of these quantities, irrespective of whether the sample has a regular component of transmittance. This facility has been used to measure the total, regular and diffuse reflectances of five types of coating for radiometers. A polar scattering facility at Sira using 10.6 mu m radiation has been used to investigate the angular reflection properties of the coatings. Results from both techniques show that coating thickness can be critical for adequate performance, and that some types of particulate metal coating are not very reproducible in their properties.
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Betts et al. (1985) studied this question.
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