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17 July 2018 The calibration procedure of the LINC-NIRVANA ground and high layer WFS
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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.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carmelo Arcidiacono, Kalyan Kumar Radhakrishnan Santhakumari, Valentina Viotto, Maria Bergomi, Florian Briegel, Thomas Bertram, Luca Marafatto, Tom Herbst, Jacopo Farinato, Roberto Ragazzoni, Ralph Hofferbert, Martin Kürster, Frank Kittmann, Jürgen Berwein, and Harald Baumeister "The calibration procedure of the LINC-NIRVANA ground and high layer WFS", Proc. SPIE 10703, Adaptive Optics Systems VI, 107034R (17 July 2018); doi: 10.1117/12.2313152; https://doi.org/10.1117/12.2313152
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