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Proceedings Paper

Optical throughput model
Author(s): Luke M. Elasky; Steven A. Smallwood; Roy P. Galvin
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Paper Abstract

ITT Exelis builds electro optical telescopes and uses an optical throughput model in spreadsheet form to determine the transmission degradation due to contamination. The model can also be used to determine allowable contamination given a transmission requirement. Molecular contamination affects the transmission due to the absorbance of the optical contaminant while the particulate contamination affects the optical transmission due to obstruction and absorption of light, the model does not currently consider diffraction effects. The optical throughput model uses wavelength dependant absorption coefficients to determine the impact of the molecular contaminant. Optical transmission due to particles is analyzed by using the obscuration of the particle distribution. All optical elements in the telescope are analyzed by using the maximum angle of incidence for each optic. An expression was developed for non normal light assuming spherical particles and included light that was blocked by reflected incident light.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8492, Optical System Contamination: Effects, Measurements, and Control 2012, 84920M (15 October 2012); doi: 10.1117/12.930612
Show Author Affiliations
Luke M. Elasky, ITT Exelis Inc. (United States)
Steven A. Smallwood, ITT Exelis Inc. (United States)
Roy P. Galvin, ITT Exelis Inc. (United States)

Published in SPIE Proceedings Vol. 8492:
Optical System Contamination: Effects, Measurements, and Control 2012
Sharon A. Straka; Nancy Carosso; Joanne Egges, Editor(s)

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