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The calibration procedure of the LINC-NIRVANA ground and high layer WFS
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Paper Abstract

LINC–NIRVANA (LN) is a MCAO module currently mounted on the Rear Bent Gregorian focus of the Large Binocular Telescope (LBT). It mounts a camera originally design to realize the interferometric imaging focal station of the LBT. LN follows the LBT strategy having two twin channels: a double Layer Oriented multi-conjugate adaptive optics system assists the two arms, supplying high order wave-front correction. In order to counterbalance the field rotation a mechanical derotation is applied for the two ground wave-front sensors, and an optical (K-mirror) one for the two high layers sensors, fixing the positions of the focal planes with respect to the pyramids aboard the wavefront sensors. The derotation introduces a pupil images rotation on the wavefront sensors changing the projection of the deformable mirrors on the sensor consequently. The soft real-time computer load the matrix corresponding to the needed at one degree step. Calibrations were performed in daytime only and using optical fibers.

Paper Details

Date Published: 17 July 2018
PDF: 9 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107034R (17 July 2018); doi: 10.1117/12.2313152
Show Author Affiliations
Carmelo Arcidiacono, INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Kalyan Kumar Radhakrishnan Santhakumari, Max-Planck-Institut für Astronomie (Germany)
Valentina Viotto, INAF - Osservatorio Astronomico di Padova (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Maria Bergomi, INAF - Osservatorio Astronomico di Padova (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Florian Briegel, Max-Planck-Institut für Astronomie (Germany)
Thomas Bertram, Max-Planck-Institut für Astronomie (Germany)
Luca Marafatto, INAF - Osservatorio Astronomico di Padova (Germany)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Tom Herbst, Max-Planck-Institut für Astronomie (Germany)
Jacopo Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Roberto Ragazzoni, INAF - Osservatorio Astronomico di Padova (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
Ralph Hofferbert, Max-Planck-Institut für Astronomie (Germany)
Martin Kürster, Max-Planck-Institut für Astronomie (Germany)
Frank Kittmann, Max-Planck-Institut für Astronomie (Germany)
Jürgen Berwein, Max-Planck-Institut für Astronomie (Germany)
Harald Baumeister, Max-Planck-Institut für Astronomie (Germany)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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