1 January 1987 Assessment Of Condensable Molecular And Particulate Contamination Upon Optical Elements In Space Systems
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Abstract
Scattering by condensible molecular contamination on mirrors can be modeled by assuming the contaminant has not uniformly covered the surface, but has coalesced into spherical particles. BRDF values representing scatter from these particles can be calculated by Mie theory. The model suggests that particles formed from the equivalent of a 10Å layer of molecular contaminant could give BRDF (1°) of approximately 5 x 10-4, for 10.6μ light. Thicker layers of molecular contamination could give BRDFs that begin to degrade stray light rejection in space telescopes.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lawrence M. Scherr, William Lee, "Assessment Of Condensable Molecular And Particulate Contamination Upon Optical Elements In Space Systems", Proc. SPIE 0777, Optical Systems Contamination: Effects, Measurement, Control, (1 January 1987); doi: 10.1117/12.967072; https://doi.org/10.1117/12.967072
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KEYWORDS
Particles

Bidirectional reflectance transmission function

Contamination

Optical spheres

Scattering

Mirrors

Contamination control

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