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

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

doi:10.1117/12.857163

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

Jul 19, 2010

9 pages

Part of Proceedings, SPIE Astronomical Telescopes + Instrumentation: High Energy, Optical, and Infrared Detectors for Astronomy IV : San Diego, California, June 27-July 2, 2010

Published in:

Proc.SPIE Int.Soc.Opt.Eng. 7739 (2010) 77390U

Contribution to:

SPIE Astronomical Telescopes + Instrumentation

Published: Jul 19, 2010

DOI:

10.1117/12.857163

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Abstract: (International Society for Optics and Photonics)

The Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU) will be equipped with new metrology systems toactively control the optical alignment of the new four-mirror Wide-Field Corrector (WFC) as it tracks sidereal motionwith respect to the fixed primary mirror. These systems include a tip/tilt sensor (TTS), distance measuringinterferometers (DMI), guide probes (GP), and wavefront sensors (WFS). While the TTS and DMIs are to monitor themechanical alignment of the WFC, the WFSs and GPs will produce direct measurement of the optical alignment of theWFC with respect to the HET primary mirror. Together, these systems provide fully redundant alignment and pointinginformation 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.

Metrology
Active alignment
Hobby-Eberly Telescope
HETDEX

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