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Proceedings Paper

Simple techniques for modeling wavefront error in imaging systems
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Paper Abstract

The performance of an optical system depends on the characteristics manufacturing errors of the mirrors, including aberrations on the primary mirror. When designing a system and evaluating its expected performance, the exact nature of the aberrations is not known beforehand, so approximations and simplifying assumptions need to be made. A common assumption is that aberrations of the primary mirror take the form of correlated Gaussian peaks and valleys about the ideal (perfectly spherical) primary mirror. The effect of such correlated Gaussian imperfections can be calculated in an average sense, using the optical quality factor (OQF) to modify the diffraction-limited modulation transfer function (MTF). Alternatively, a single instantiation of the aberrations can be added as phase variations to the pupil function, followed by calculation of the MTF. In this paper we compare these two methods of modeling the effects of correlated Gaussian aberrations on the MTF and point spread function (PSF). We explore the parameter space within which the OQF approximation is valid and the range of possible MTFs resulting from individual instantiations of the aberrations.

Paper Details

Date Published: 8 September 2015
PDF: 12 pages
Proc. SPIE 9607, Earth Observing Systems XX, 96071B (8 September 2015); doi: 10.1117/12.2191325
Show Author Affiliations
Scott Schnee, The Aerospace Corp. (United States)
Stephen Cota, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 9607:
Earth Observing Systems XX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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