Assessment Of Condensable Molecular And Particulate Contamination Upon Optical Elements In Space Systems

Lawrence M. Scherr; William Lee

doi:10.1117/12.967072

1 January 1987 Assessment Of Condensable Molecular And Particulate Contamination Upon Optical Elements In Space Systems

Lawrence M. Scherr, William Lee

Proceedings Volume 0777, Optical Systems Contamination: Effects, Measurement, Control; (1987) https://doi.org/10.1117/12.967072
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

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.

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Lawrence M. Scherr and 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); https://doi.org/10.1117/12.967072

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