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Robust image-based wavefront sensing

URL to cite or link to: http://hdl.handle.net/1802/16800

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PDF of dissertation
Thesis (Ph. D.)--University of Rochester. Institute of Optics, 2011.
Several planned future optical systems, such as the James Webb Space Telescope (JWST), rely on image-based wavefront sensing for alignment, testing, and control of optical surfaces during operation. The focus of this work is on characterizing the effects of various non-idealities on the performance of image-based wavefront sensing algorithms, developing techniques to mitigate those effects, and demonstrating these techniques in computer simulations and in the lab. Two new techniques for algorithmically determining the proper sampling factor for optical propagation are presented and tested against experimental data collected in the lab and during JWST ground-based testing. A new method for mitigating against the effects of vibration on phase retrieval is discussed, implemented, and tested in simulation. The use of an alternative type of diversity, called transverse translation, is explored for use in the JWST and shown to be a promising technique through simulation. A method for extending the capture range of phase retrieval algorithms is presented and tested both in simulation and with experimental data collected in the lab. A benchmark of a phase retrieval algorithm running on a graphics card is presented and the practical implications for JWST testing are discussed. Finally, phase retrieval results from a MEMS deformable mirror testbed are presented and compared against interferometry. The improved robustness resulting from this research will not only help to mitigate the risks associated with wavefront sensing for the JWST, but also serve as an enabling technology for future NASA missions.
Contributor(s):
Thomas P. Zielinski (1982 - ) - Author

James R. Fienup - Thesis Advisor

Primary Item Type:
Thesis
Identifiers:
Local Call No. AS38.6635
Language:
English
Subject Keywords:
Aberrations; James Webb Space Telescope; JWST; Metrology; Phase retrieval; Wavefront sensing
Sponsor - Description:
NASA (National Aeronautics and Space Administration) - NNG05GK63A; NNX08AU12A; NNX10AT03A
First presented to the public:
10/11/2011
Originally created:
2011
Original Publication Date:
2011
Previously Published By:
University of Rochester
Place Of Publication:
Rochester, N.Y.
Citation:
Extents:
Number of Pages - xxii, 171 leaves
Illustrations - ill. (some col.)
License Grantor / Date Granted:
Marcy Strong / 2011-10-11 16:26:39.803 ( View License )
Date Deposited
2011-10-11 16:26:39.803
Date Last Updated
2012-09-26 16:35:14.586719
Submitter:
Marcy Strong

Copyright © This item is protected by copyright, with all rights reserved.

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