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Black Paints for Far Infrared Cryogenic Use

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Abstract

A cryogenic paint which remains absorptive throughout the infrared has been developed. The paint exhibits excellent surface stability at liquid helium temperature and is resistant to abrasion and flaking. Measurements in a specially constructed cryogenic integrating sphere indicate that the paint is ~92–100% absorptive in the 70–130-μ range. Additional broadband measurements at 60 μ–130 μ, 18 μ–25 μ, and 400 μ–1 mm indicate that the paint is ~95% absorptive.

© 1971 Optical Society of America

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