19 July 2010 Metrology systems for active alignment control of the Hobby-Eberly Telescope wide field corrector
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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, Hanshin Lee, Gary J. Hill, Gary J. Hill, Michael Hart, Michael Hart, Mark E. Cornell, Mark E. Cornell, Richard Savage, Richard Savage, Brian Vattiat, Brian Vattiat, Dave Perry, Dave Perry, William M. Moller, William M. Moller, Tom Rafferty, Tom Rafferty, Trey Taylor, Trey Taylor, Marc D. Rafal, 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); doi: 10.1117/12.857163; https://doi.org/10.1117/12.857163
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