Metrology systems of the Hobby-Eberly Telescope Wide Field Upgrade

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Scopus citations

Abstract

The Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU) will be equipped with new closed-loop 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 camera (TTCam), distance measuring interferometers (DMI), guide probes (GP), and wavefront sensors (WFS). While the TTCam 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 alignmentdriven field aberrations. In addition to these closed-loop metrology systems, we will have a pupil viewing camera (PVCam) and a calibration wavefront sensor (CWFS). The PVCam will be used for occasional reflectance measurement of the HET primary mirror segments in the standard R,G,B colors. The CWFS will provide the reference wavefront signal against which the other two WFS are calibrated. We describe the current snapshot of these systems and discuss lab/on-sky performance test results of the systems.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Telescopes IV
DOIs
Publication statusPublished - Dec 1 2012
Externally publishedYes
EventGround-Based and Airborne Telescopes IV - Amsterdam, Netherlands
Duration: Jul 1 2012Jul 6 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8444
ISSN (Print)0277-786X

Other

OtherGround-Based and Airborne Telescopes IV
CountryNetherlands
CityAmsterdam
Period7/1/127/6/12

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Keywords

  • HETDEX
  • Hobby-Eberly Telescope
  • Metrology systems

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Lee, H., Hill, G. J., Cornell, M. E., Vattiat, B., Perry, D., Rafferty, T., ... Savage, R. (2012). Metrology systems of the Hobby-Eberly Telescope Wide Field Upgrade. In Ground-Based and Airborne Telescopes IV [84444S] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8444). https://doi.org/10.1117/12.926732