Translator Disclaimer
23 July 2008 Image motion correction using accelerometers at the MMT Observatory
Author Affiliations +
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Stalcup and K. Powell "Image motion correction using accelerometers at the MMT Observatory", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181H (23 July 2008); doi: 10.1117/12.790113;


The ARGOS laser system green light for ground layer...
Proceedings of SPIE (July 20 2014)
ShaneAO an enhanced adaptive optics and IR imaging system...
Proceedings of SPIE (September 12 2012)
NAOMI: adaptive optics at the WHT
Proceedings of SPIE (October 24 2004)
Making instruments work on the European ELT
Proceedings of SPIE (July 13 2008)
UnlSlS adaptive optics system at the Mt. Wilson 2.5 m...
Proceedings of SPIE (February 06 2003)

Back to Top