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Proceedings Paper

Metrology systems for active alignment control of the Hobby-Eberly Telescope wide field corrector
Author(s): 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
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Paper 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.

Paper Details

Date Published: 19 July 2010
PDF: 9 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390U (19 July 2010); doi: 10.1117/12.857163
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)
Michael Hart, Hart Scientific Consulting International L.L.C. (United States)
Mark E. Cornell, McDonald Observatory, The Univ. of Texas at Austin (United States)
Richard Savage, McDonald Observatory, The Univ. of Texas at Austin (United States)
Brian Vattiat, McDonald Observatory, The Univ. of Texas at Austin (United States)
Dave Perry, McDonald Observatory, The Univ. of Texas at Austin (United States)
William M. Moller, McDonald Observatory, The Univ. of Texas at Austin (United States)
Tom Rafferty, McDonald Observatory, The Univ. of Texas at Austin (United States)
Trey Taylor, McDonald Observatory, The Univ. of Texas at Austin (United States)
Marc D. Rafal, McDonald Observatory, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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