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11 July 2008 The adaptive secondary mirror for the Large Binocular Telescope: results of acceptance laboratory test
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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); doi: 10.1117/12.790527; https://doi.org/10.1117/12.790527
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