Active optics challenges of a thirty-meter segmented mirror telescopy

George Z. Angeli; Robert S. Upton; Anna Segurson; Brent L. Ellerbroek

doi:10.1117/12.566326

7 July 2004 Active optics challenges of a thirty-meter segmented mirror telescopy

George Z. Angeli, Robert S. Upton, Anna Segurson, Brent L. Ellerbroek

Proceedings Volume 5382, Second Backaskog Workshop on Extremely Large Telescopes; (2004) https://doi.org/10.1117/12.566326
Event: Second Backaskog Workshop on Extremely Large Telescopes, 2003, Backaskog, Sweden

Abstract

Ground-based telescopes operate in a turbulent atmosphere that affects the optical path across the aperture by changing both the mirror positions (wind seeing) and the air refraction index in the light path (atmospheric seeing). In wide field observations, when adaptive optics is not feasible, active optics are the only means of minimizing the effects of wind buffeting. An integrated, dynamic model of wind buffeting, telescope structure, and optical performance was devleoped to investigate wind energy propagation into primary mirror modes and secondary mirror rigid body motion.Although the rsults showed that the current level of wind modeling was not appropriate to decisively settle the need for optical feedback loops in active optics, the simulations strongly indicated the capability of a limited bandwidth edge sensor loop to maintain the continuity of the primary mirror inside the preliminary error budget. It was also found that the largest contributor to the wind seeing is image jitter, i.e. OPD tip/tilt.

Citation Download Citation

George Z. Angeli, Robert S. Upton, Anna Segurson, and Brent L. Ellerbroek "Active optics challenges of a thirty-meter segmented mirror telescopy", Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); https://doi.org/10.1117/12.566326

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