@inproceedings{00a0a6213f6d4b25be29c1e3b7002b9d,
title = "Metrology systems for active alignment control of the Hobby-Eberly Telescope Wide Field Corrector",
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.",
keywords = "Active alignment, HETDEX, Hobby-Eberly Telescope, Metrology",
author = "Hanshin Lee and Hill, {Gary J.} and Michael Hart and Cornell, {Mark E.} and Richard Savage and Brian Vattiat and Dave Perry and Moller, {William M.} and Tom Rafferty and Trey Taylor and Rafal, {Marc D.}",
year = "2010",
doi = "10.1117/12.857163",
language = "English (US)",
isbn = "9780819482297",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Modern Technologies in Space- and Ground-Based Telescopes and Instrumentation",
note = "Modern Technologies in Space- and Ground-Based Telescopes and Instrumentation ; Conference date: 27-06-2010 Through 02-07-2010",
}