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Proceedings Paper • Open Access

Comparative theoretical and experimental study of a Shack-Hartmann and a phase diversity sensor, for high-precision wavefront sensing dedicated to space active optics
Author(s): A. Montmerle Bonnefois; T. Fusco; S. Meimon; V. Michau; L. Mugnier; J.-F. Sauvage; C. Engel; C. Escolle; M. Ferrari; E. Hugot; A. Liotard; M. Bernot; M. Carlavan; F. Falzon; T. Bret-Dibat; D. Laubier

Paper Abstract

Earth-imaging or Universe Science satellites are always in need of higher spatial resolutions, in order to discern finer and finer details in images. This means that every new generation of satellites must have a larger main mirror than the previous one, because of the diffraction. Since it allows the use of larger mirrors, active optics is presently studied for the next generation of satellites. To measure the aberrations of such an active telescope, the Shack-Hartmann (SH), and the phase-diversity (PD) are the two wavefront sensors (WFS) considered preferentially because they are able to work with an extended source like the Earth's surface, as well as point sources like stars.

The RASCASSE project was commissioned by the French spatial agency (CNES) to study the SH and PD sensors for high-performance wavefront sensing. It involved ONERA and Thales Alenia Space (TAS), and LAM. Papers by TAS and LAM on the same project are available in this conference, too [1,2].

The purpose of our work at ONERA was to explore what the best performance both wavefront sensors can achieve in a space optics context. So we first performed a theoretical study in order to identify the main sources of errors and quantify them — then we validated those results experimentally.

The outline of this paper follows this approach: we first discuss phase diversity theoretical results, then Shack-Hartmann’s, then experimental results — to finally conclude on each sensor’s performance, and compare their weak and strong points.

Paper Details

Date Published: 17 November 2017
PDF: 9 pages
Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105634B (17 November 2017); doi: 10.1117/12.2304263
Show Author Affiliations
A. Montmerle Bonnefois, ONERA (France)
T. Fusco, ONERA (France)
Lab. d’Astrophysique de Marseille (France)
S. Meimon, ONERA (France)
V. Michau, ONERA (France)
L. Mugnier, ONERA (France)
J.-F. Sauvage, ONERA (France)
C. Engel, Lab. d’Astrophysique de Marseille (France)
C. Escolle, Lab. d’Astrophysique de Marseille (France)
M. Ferrari, Lab. d’Astrophysique de Marseille (France)
E. Hugot, Lab. d’Astrophysique de Marseille (France)
A. Liotard, Thalès Alenia Space (France)
M. Bernot, Thalès Alenia Space (France)
M. Carlavan, Thalès Alenia Space (France)
F. Falzon, Thalès Alenia Space (France)
T. Bret-Dibat, CNES (France)
D. Laubier, CNES (France)

Published in SPIE Proceedings Vol. 10563:
International Conference on Space Optics — ICSO 2014
Zoran Sodnik; Bruno Cugny; Nikos Karafolas, Editor(s)

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