Scatter from particulate-contaminated mirrors. part 4: properties of   scatter from dust for visible to far-infrared wavelengths

Paul R. Spyak; William L. Wolfe

doi:10.1117/12.58711

1 August 1992 Scatter from particulate-contaminated mirrors. part 4: properties of scatter from dust for visible to far-infrared wavelengths

Paul R. Spyak, William L. Wolfe

Author Affiliations +

Optical Engineering, Vol. 31, Issue 8, (August 1992). https://doi.org/10.1117/12.58711

Abstract

It is shown that the far-infrared scatter from smooth mirrors can be dominated by the scatter from just a few very small particles or defects. This emphasizes the necessity for good cleaning techniques and good clean-room procedures. Several effects of this finding are discussed, as well as several other related topics: the cleanliness required for the scatter to be dominated by a mirror's surface microroughness; a proposed specification for low-scatter infrared mirrors; incident angle invariance of clean and contaminated mirrors; the shape ofthe bidirectional reflectance distribution function (BRDF) curves; and the relation between surface cleanliness level, clean-room cleanliness class, and BRDF.

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Paul R. Spyak and William L. Wolfe "Scatter from particulate-contaminated mirrors. part 4: properties of scatter from dust for visible to far-infrared wavelengths," Optical Engineering 31(8), (1 August 1992). https://doi.org/10.1117/12.58711

Published: 1 August 1992

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