Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7738e..50l&link_type=abstract
Modeling, Systems Engineering, and Project Management for Astronomy IV. Edited by Angeli, George Z.; Dierickx, Philippe. Proce
Astronomy and Astrophysics
Astronomy
Scientific paper
Primary mirror segment figure error is potentially deleterious to the wavefront sensing in the new Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU). Previous measurements indicated the presence of figure errors including prominent surface astigmatism on the segments, but need a systematic analysis to quantify the amounts. We developed a Phase Retrieval procedure that estimates the surface figure map by applying the iterative transform method to a set of focus-diversed images of a point source formed by the 91 segments of the 11m HET primary mirror. In this paper, we discuss this analysis and the implication of the analysis results for wavefront sensing on the upgraded HET.
Hart Michael
Hill Gary J.
Lee Hanshin
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