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

Date Issued
2018
Author(s)
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Briegel, Florian
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Bertram, Thomas
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Herbst, Tom
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Hofferbert, Ralph
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Kürster, Martin
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Kittmann, Frank
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Berwein, Jürgen
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Baumeister, Harald
DOI
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.
Coverage
Adaptive Optics Systems VI
All editors
Close, Laird M.; Schreiber, Laura; Schmidt, Dirk
Series
Volume
10703
Start page
107034R
Conferenece
Adaptive Optics Systems VI
Conferenece place
Austin, Texas, United States
Conferenece date
10 - 15 June, 2018
Uri
Url
Issn Identifier
0277-786X
Ads BibCode
2018SPIE10703E..4RA
Rights
open.access
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