An Investigation of Infrared Diffuser Surfaces
Final rept. 1 Jan 1972-30 Jun 1973
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A study of several possible infrared diffuser surfaces has been carried out for near-normal psi 10 deg incident radiation. Gold-coated grit surfaces, chemically etched aluminum, powdered sodium chloride, sulfur, magnesium oxide, and beaded surfaces were investigated using infrared bandpass filters. Angular distribution measurements of reflected radiation were made for the following infrared wavelength intervals lambda 1.4, 7.5 to 14.5, 11.8 to 15.5, 14.0 to 23, and 19.1 to 22.5 micrometers. Of all the surfaces investigated, it appears that powdered salt coatings are the most uniform and come closest to being a Lambert surface for infrared radiation. The gold-coated grit surfaces and the chemically etched aluminum also diffuse the infrared radiation somewhat but are nonuniform when viewed on a small scale.