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Proceedings Paper

Image motion correction using accelerometers at the MMT Observatory
Author(s): T. Stalcup; K. Powell
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Paper Abstract

At the MMT Observatory, the adaptive secondary system is producing well corrected images using natural guide stars. Shortly after the system came online, however, it was found that vibrations in the telescope structure were limiting the Strehl of the corrected image. The worst of these vibrations are at 19 Hz, which puts them just outside of the system correction bandwidth. The laser guide star system at the MMT is also impacted by a different vibration mode at 14 Hz that affects the pointing of the laser beacon on the sky. To correct these errors, accelerometers were installed on the secondary mirror to measure its motion. The measured motion was then used to generate a feed-forward correction term which has already been proven in on-sky testing to work for the LGS case. The NGS case is more difficult and attempts to correct image motion have failed due to excessive feedback.

Paper Details

Date Published: 23 July 2008
PDF: 11 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181H (23 July 2008); doi: 10.1117/12.790113
Show Author Affiliations
T. Stalcup, MMT Observatory (United States)
K. Powell, Steward Observatory, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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