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Active optics challenges of a thirty-meter segmented mirror telescopy

Angeli, George Z. and Upton, Robert and Segurson, Anna and Ellerbroek, Brent (2004) Active optics challenges of a thirty-meter segmented mirror telescopy. In: Second Bäckaskog Workshop on Extremely Large Telescopes. Proceedings of SPIE. No.5382. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 337-345. https://resolver.caltech.edu/CaltechAUTHORS:20190116-085217908

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.566326DOIArticle
Additional Information:© 2004 Society of Photo-optical Instrumentation Engineers (SPIE). The New Initiatives Office is a partnership between two divisions of the Association of Universities for Research in Astronomy (AURA), Inc.: the National Optical Astronomy Observatory (NOAO) and the Gemini Observatory. NOAO is operated by AURA under cooperative agreement with the National Science Foundation (NSF). The Gemini Observatory is operated by AURA under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil) and CONICET (Argentina).
Funders:
Funding AgencyGrant Number
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
Gemini ObservatoryUNSPECIFIED
NSFUNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Subject Keywords:active optics, telescope control, segmented mirror control, wind buffeting
Series Name:Proceedings of SPIE
Issue or Number:5382
Record Number:CaltechAUTHORS:20190116-085217908
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190116-085217908
Official Citation:George Z. Angeli, Robert S. Upton, Anna Segurson, 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); doi: 10.1117/12.566326
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92311
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Jan 2019 03:46
Last Modified:03 Oct 2019 20:43

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