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Proceedings Paper

Noniterative methodology for obtaining a wavefront directly from phase diversity measurements
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Paper Abstract

Large segmented and distributed aperture telescopes increasingly rely on innovative imaging techniques such as phase diversity and phase retrieval. These algorithms obtain the phase aberration in a dynamic system by different estimation techniques using the information from in-focus and out-of-focus images of extended objects and point objects, respectively. These estimation techniques are generally iterative and suffer from the usual pitfalls of CPU demands and failure modes. An alternative method would be to obtain an expression for the wavefront directly from the phase diversity measurements. The optimal wavefront expression would be expressed as a polynomial times the unaberrated OTF derived from the aberrated PSF. In this paper, we first obtain the expansion of the aberrated PSF with an explicit dependence on the amount of diversity and explore the implications of varying amounts of diversity as well as different numbers of diversity planes. Finally, we discuss solutions for the wavefront expression.

Paper Details

Date Published: 5 March 2003
PDF: 8 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461560
Show Author Affiliations
Barbara Tehan Landesman, Lockheed Martin Space Systems Co. (United States)
Gopal Vasudevan, Lockheed Martin Space Systems Co. (United States)
Eric H. Smith, Lockheed Martin Space Ststems Co. (United States)

Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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