Wavefront sensing for active alignment control of a telescope with dynamically varying pupil geometry: theory, implementation, on-sky performance

Hanshin Lee; Gary J. Hill; Niv Drory; Jason Ramsey; Randy Bryant; Matthew Shetrone

doi:10.1117/12.2314101

10 July 2018 Wavefront sensing for active alignment control of a telescope with dynamically varying pupil geometry: theory, implementation, on-sky performance

Hanshin Lee, Gary J. Hill, Niv Drory, Jason Ramsey, Randy Bryant, Matthew Shetrone

Author Affiliations +

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107064P (2018) https://doi.org/10.1117/12.2314101
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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Hanshin Lee, Gary J. Hill, Niv Drory, Jason Ramsey, Randy Bryant, and Matthew Shetrone "Wavefront sensing for active alignment control of a telescope with dynamically varying pupil geometry: theory, implementation, on-sky performance", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064P (10 July 2018); https://doi.org/10.1117/12.2314101

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KEYWORDS

Telescopes

Mirrors

Optical alignment

Wavefront sensors

Cameras

Metrology

Shape analysis

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