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Proceedings Paper

LBT adaptive secondary unit final design and construction
Author(s): Daniele Gallieni; Enzo Anaclerio; Paolo G. Lazzarini; Angelo Ripamonti; Roberto Spairani; Ciro Del Vecchio; Piero Salinari; Armando Riccardi; Paolo Stefanini; Roberto Biasi
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Paper Abstract

The Large Binocular Telescope will perform its first level AO correction at visual wavelengths by the two Gregorian secondary mirrors. Each unit is made by a 911 mm diameter and 1.6 mm thick Zerodur shell which shape is controlled by 672 electromagnetic actuators at 1 kHz rate. The shape of each mirror is referred to a Zerodur 50 mm thick backplate through a set of capacitive sensors co-located with the actuators. Each adaptive secondary unit embeds its real time computer for actuator control and communication. Each unit is aligned into the secondary hub by a 6 d.o.f. hexapod system. The construction of the AO units started this year, while the hexapods have been completed in 2001. We present in this paper the final design of the adaptive secondary systems with particular emphasis on the modifications that we made based on the MMT adaptive secondary experience. We will also report the first results of the subsystems development tests.

Paper Details

Date Published: 7 February 2003
PDF: 7 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.458851
Show Author Affiliations
Daniele Gallieni, ADS International S.r.l. (Italy)
Enzo Anaclerio, ADS International S.r.l. (Italy)
Paolo G. Lazzarini, ADS International S.r.l. (Italy)
Angelo Ripamonti, ADS International S.r.l. (Italy)
Roberto Spairani, SOLARIA Engineering (Italy)
Ciro Del Vecchio, Osservatorio Astrofisico di Arcetri (Italy)
Piero Salinari, Osservatorio Astrofisico di Arcetri (Italy)
Armando Riccardi, Osservatorio Astrofisico di Arcetri (Italy)
Paolo Stefanini, Osservatorio Astrofisico di Arcetri (Italy)
Roberto Biasi, Microgate S.r.l. (Italy)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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