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Proceedings Paper

Adaptive secondary mirrors for the large binocular telescope
Author(s): Armando Riccardi; Guido Brusa; Piero Salinari; Simone Busoni; Oliver Lardiere; Piero Ranfagni; Daniele Gallieni; Roberto Biasi; Mario Andrighettoni; Steve Miller; Paolo Mantegazza
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Paper Abstract

The two 911mm-diameter adaptive secondary (AS) mirrors for the Large Binocular telescope (LBT) are currently under construction. The design of the units has been based on the extensive experience made on the MMT adaptive secondary mirror during laboratory tests and telescope runs. Mechanics, electronics and control logic have been revised to improve performances and reliability. Each unit has 672 electro-magnetic force actuators. They control the figure of the Gregorian secondary 1.6mm-thick mirrors with an internal loop using the signal of co-located capacitive sensors. The improvement in the computational power of the on-board control electronics allows to use it as real-time computer for wavefront reconstruction. We present the progress of the final unit construction and the preliminary laboratory results obtained with a 45-actuator sub-system used to test the new features introduced in the electronics and mechanics of LBT adaptive secondary mirrors.

Paper Details

Date Published: 24 December 2003
PDF: 10 pages
Proc. SPIE 5169, Astronomical Adaptive Optics Systems and Applications, (24 December 2003); doi: 10.1117/12.511374
Show Author Affiliations
Armando Riccardi, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Guido Brusa, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Stewart Observatory/Univ. of Arizona (United States)
Piero Salinari, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Simone Busoni, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Oliver Lardiere, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Piero Ranfagni, Osservatorio Astrofisico di Arcetri/INAF (Italy)
Daniele Gallieni, ADS International Srl (Italy)
Roberto Biasi, MicroGate Srl (Italy)
Mario Andrighettoni, MicroGate Srl (Italy)
Steve Miller, Steward Observatory/Univ. of Arizona (United States)
Paolo Mantegazza, Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 5169:
Astronomical Adaptive Optics Systems and Applications
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

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