28 September 1999 Durable coating for suppressing stray infrared radiation inside optical instruments
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Abstract
Rugged coatings, originally developed for thermographic purposes in the 8-14 (mu) IR band, have been found to be useful as stray-light suppressants in optical instrumentation. Data on the hemispherical diffuse and goniophotometric reflectances of one formulation of this coating are presented. Diffuse reflectance in the 8-14(mu) wavelength region is below 5 percent, and even lower at 3 (mu) . Normal incidence specular reflectance is below 1 percent in the IR, and increases with angle in accordance with theory for physically rough surfaces. The coatings are moderately electrically conducting. They adhere readily to aluminum, silicon, glass, and other substrates; can be handled routinely with no loss of optical properties; have survived 500 degrees F temperatures at Mach 14; and may be modified to give high absorptivity also in the visible region.
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John N. Pike, John N. Pike, Yogesh Mehrotra, Yogesh Mehrotra, } "Durable coating for suppressing stray infrared radiation inside optical instruments", Proc. SPIE 3786, Optomechanical Engineering and Vibration Control, (28 September 1999); doi: 10.1117/12.363803; https://doi.org/10.1117/12.363803
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