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Proceedings Paper

WIYN tip-tilt module performance
Author(s): Charles F. Claver; Charles Corson; R. Richard Gomez; Philip N. Daly; David M. Dryden; Behzod Abareshi
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Paper Abstract

The WIYN Tip-Tilt Module (WTTM) is an addition to the existing Instrument Adapter System (IAS) providing a high performance optical-NIR image stabilized port on the WIYN 3.5m telescope. The WTTM optical system uses a 3-mirror off-axis design along with a high bandwidth tilt mirror. The WTTM is a reimaging system with 15% magnification producing a 4x4 arcminute field of view and near diffraction limited imagery from 400-2000nm. The optics are diamond turned in electroless Nickel over an Aluminum substrate. The WTTM opto-mechanical assembly was designed and built using the principals of the "build-to-print" technique, where the entire system is fabricated and assembled to tolerance with no adjustments. A unique high performance error sensor, using an internal mirrorlette array that feeds 4 fiber coupled avalanche photodiode photon counters, provides the tilt signal. The system runs under the Real-Time Linux operating system providing a maximum closed loop rate of 3khz. In this paper we report on the successful lab testing, verification of the "build-to-print" technique and on telescope performance of the WTTM.

Paper Details

Date Published: 4 February 2003
PDF: 10 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.458676
Show Author Affiliations
Charles F. Claver, National Optical Astronomy Observatories (United States)
Charles Corson, National Optical Astronomy Observatories (United States)
R. Richard Gomez, National Optical Astronomy Observatories (United States)
Philip N. Daly, National Optical Astronomy Observatories (United States)
David M. Dryden, National Optical Astronomy Observatories (United States)
Behzod Abareshi, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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