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Wavefront sensing for active alignment control of a telescope with dynamically varying pupil geometry: theory, implementation, on-sky performance
Author(s): Hanshin Lee; Gary J. Hill; Niv Drory; Jason Ramsey; Randy Bryant; Matthew Shetrone
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Paper Abstract

Unlike conventional astronomical telescopes, there are telescope systems that have fixed altitude primary mirrors over which prime focus cameras track the sidereal motion. Examples include the Hobby Eberly Telescope (HET) in Texas and the South African Large Telescope (SALT) in Cape Town. These systems benefit from the economy of fixed primary mirrors but pose a unique challenge in active alignment control of such telescope systems using wavefront sensor feedbacks. To handle this situation, we developed a way of estimating orthonormal aberration coefficients over dynamically varying pupil geometries and implemented this as part of the multi-year upgrade of the HET. We detail the theory, implementation, and on-sky performance of this technique in the active alignment control of the HET based on the data collected during the HET upgrade commissioning and science operations since late 2015.

Paper Details

Date Published: 10 July 2018
PDF: 8 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064P (10 July 2018); doi: 10.1117/12.2314101
Show Author Affiliations
Hanshin Lee, McDonald Observatory, The Univ. of Texas at Austin (United States)
Gary J. Hill, McDonald Observatory, The Univ. of Texas at Austin (United States)
Niv Drory, McDonald Observatory, The Univ. of Texas at Austin (United States)
Jason Ramsey, McDonald Observatory, The Univ. of Texas at Austin (United States)
Randy Bryant, Hobby-Eberly Telescope (United States)
The Univ. of Texas at Austin (United States)
Matthew Shetrone, Hobby-Eberly Telescope (United States)
The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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