Metrology systems for active alignment control of the Hobby-Eberly Telescope wide field corrector

Hanshin Lee; Gary J. Hill; Michael Hart; Mark E. Cornell; Richard Savage; Brian Vattiat; Dave Perry; William M. Moller; Tom Rafferty; Trey Taylor; Marc D. Rafal

doi:10.1117/12.857163

19 July 2010 Metrology systems for active alignment control of the Hobby-Eberly Telescope wide field corrector

Hanshin Lee, Gary J. Hill, Michael Hart, Mark E. Cornell, Richard Savage, Brian Vattiat, Dave Perry, William M. Moller, Tom Rafferty, Trey Taylor, Marc D. Rafal

Author Affiliations +

Proceedings Volume 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation; 77390U (2010) https://doi.org/10.1117/12.857163
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU) will be equipped with new metrology systems to actively control the optical alignment of the new four-mirror Wide-Field Corrector (WFC) as it tracks sidereal motion with respect to the fixed primary mirror. These systems include a tip/tilt sensor (TTS), distance measuring interferometers (DMI), guide probes (GP), and wavefront sensors (WFS). While the TTS and DMIs are to monitor the mechanical alignment of the WFC, the WFSs and GPs will produce direct measurement of the optical alignment of the WFC with respect to the HET primary mirror. Together, these systems provide fully redundant alignment and pointing information for the telescope, thereby keeping the WFC in focus and suppressing alignment-driven field aberrations. We describe the current snapshot of these systems and discuss their roles, expected performance, and operation plans.

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Hanshin Lee, Gary J. Hill, Michael Hart, Mark E. Cornell, Richard Savage, Brian Vattiat, Dave Perry, William M. Moller, Tom Rafferty, Trey Taylor, and Marc D. Rafal "Metrology systems for active alignment control of the Hobby-Eberly Telescope wide field corrector", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390U (19 July 2010); https://doi.org/10.1117/12.857163

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