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Validating the phase diversity approach for sensing NCPA in SHARK-NIR, the second-generation high-contrast imager for the Large Binocular Telescope
Author(s): D. Vassallo; J. Farinato; J.-F. Sauvage; T. Fusco; D. Greggio; E. Carolo; V. Viotto; M. Bergomi; L. Marafatto; A. Baruffolo; M. De Pascale
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Paper Abstract

Phase diversity is a focal plane wavefront sensing technique that allows to retrieve the phase aberration introduced by a camera starting from two images of whatever object, one of which (the diverse image) is intentionally corrupted by a known aberration. We present here the results of a simulation campaign aimed at assessing the validity of this approach for sensing non-common path aberrations (NCPA) in SHARK-NIR, the new-generation high-contrast imager for the Large Binocular Telescope (LBT). The aberrations to be retrieved has been modeled on a realistic error budget of the instrument, while images are generated with an end-to-end Fresnel simulator which makes use of atmospheric phase screens to simulate realistic closed-loop observations. A wide parameter space is explored in order to identify the critical parameters and to estimate the expected level of correction.

Paper Details

Date Published: 10 July 2018
PDF: 9 pages
Proc. SPIE 10705, Modeling, Systems Engineering, and Project Management for Astronomy VIII, 1070516 (10 July 2018); doi: 10.1117/12.2313301
Show Author Affiliations
D. Vassallo, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
J. Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Otticed Adattive (Italy)
J.-F. Sauvage, ONERA (France)
T. Fusco, ONERA (France)
D. Greggio, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
E. Carolo, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
V. Viotto, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
M. Bergomi, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
L. Marafatto, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
A. Baruffolo, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)
M. De Pascale, INAF - Osservatorio Astronomico di Padova (Italy)
Adoni-Lab. Nazionale di Ottiche Adattive (Italy)


Published in SPIE Proceedings Vol. 10705:
Modeling, Systems Engineering, and Project Management for Astronomy VIII
George Z. Angeli; Philippe Dierickx, Editor(s)

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