The adaptive secondary mirror for the Large Binocular Telescope: results of acceptance laboratory test

A. Riccardi; M. Xompero; D. Zanotti; L. Busoni; C. Del Vecchio; P. Salinari; P. Ranfagni; G. Brusa Zappellini; R. Biasi; M. Andrighettoni; D. Gallieni; E. Anaclerio; H. M. Martin; S. M. Miller

doi:10.1117/12.790527

11 July 2008 The adaptive secondary mirror for the Large Binocular Telescope: results of acceptance laboratory test

A. Riccardi, M. Xompero, D. Zanotti, L. Busoni, C. Del Vecchio, P. Salinari, P. Ranfagni, G. Brusa Zappellini, R. Biasi, M. Andrighettoni, D. Gallieni, E. Anaclerio, H. M. Martin, S. M. Miller

Author Affiliations +

Proceedings Volume 7015, Adaptive Optics Systems; 701512 (2008) https://doi.org/10.1117/12.790527
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The first of the two Gregorian Adaptive Secondary Mirror (ASM) units for the Large Binocular Telescope (LBT) has been fully integrated and tested for laboratory acceptance. The LBT unit represents the most advanced ASM device existing in hardware. The unit has 672 electro-magnetic force actuators to change the shape of the 1.6mm-thick and 911mm-diameter Zerodur shell. The actuators control the mirror figure using the position feedback from the internal metrology provided by co-located capacitive sensors. The on-board real-time control electronics has a parallel computational power of 163Gflop/s providing not only the internal control of the unit with a 72kHz loop but also the wavefront reconstruction for the 1kHz Adaptive Optics loop. The paper describes the final configuration of the system and reports the results of the characterization and optimization process together with the results of the laboratory acceptance tests.

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A. Riccardi, M. Xompero, D. Zanotti, L. Busoni, C. Del Vecchio, P. Salinari, P. Ranfagni, G. Brusa Zappellini, R. Biasi, M. Andrighettoni, D. Gallieni, E. Anaclerio, H. M. Martin, and S. M. Miller "The adaptive secondary mirror for the Large Binocular Telescope: results of acceptance laboratory test", Proc. SPIE 7015, Adaptive Optics Systems, 701512 (11 July 2008); https://doi.org/10.1117/12.790527

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