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Proceedings Paper

Low-light-level adaptive optics for a two-telescope interferometer scheme
Author(s): David W. Tyler; Gerard Rousset; Sergio R. Restaino; Gary C. Loos
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Paper Abstract

We study the use of a cross-correlation algorithm as a sub-aperture slope estimator in a low light-level adaptive optics scheme for a two-telescope interferometer. Using a computer simulation of a Hartmann-Shack wavefront sensor to compare the algorithm against a conventional intensity-centroid estimator, we find that the cross-correlation algorithm marginally reduces the mean-square slope-measurement error under shot-noise limited conditions and significantly reduces the error in the presence of additive noise. We compare the performance of the two estimators in a two-telescope interferometer scheme by introducing wavefront sensor noise with appropriate variance in a full adaptive optics simulation, calculating measures-of-merit appropriate to interferometric imaging such as fringe visibility and coherent energy.

Paper Details

Date Published: 9 November 1993
PDF: 10 pages
Proc. SPIE 2029, Digital Image Recovery and Synthesis II, (9 November 1993); doi: 10.1117/12.162016
Show Author Affiliations
David W. Tyler, Rockwell Power Systems (United States)
Gerard Rousset, ONERA (France)
Sergio R. Restaino, Air Force Phillips Lab. (United States)
Gary C. Loos, Air Force Phillips Lab. (United States)

Published in SPIE Proceedings Vol. 2029:
Digital Image Recovery and Synthesis II
Paul S. Idell, Editor(s)

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