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Proceedings Paper • Open Access

Wavefront sensor for the GAIA Mission
Author(s): Amir Vosteen; Folkert Draaisma; Willem van Werkhoven; Luud van Riel; Margreet Mol; Wim Gielesen

Paper Abstract

TNO has developed, built and tested the Wave Front Sensor (WFS) for ESA’s Gaia mission. The WFS will help Gaia create an extraordinarily precise three-dimensional map of more than one billion stars in our Galaxy. Part of ESA's Cosmic Vision programme, Gaia’s build is led by EADS Astrium and is scheduled for launch in 2012. The Wave Front Sensor will be used to monitor the wave front errors of the two main telescopes mounted on the GAIA satellite. These mirrors include a 5-degree of freedom (DOF) mechanism that can be used to minimize the wave front errors during operation. The GAIA-WFS will operate over a broad wavelength (450 to 900 nm) and under cryogenic conditions (130 to 200 K operation temperature). The WFS uses an all reflective, a-thermal design and is of the type of Shack-Hartmann. The boundary condition for the design is that the focal plane of the WFS is the same plane as the focal plane of the GAIA telescopes. The spot pattern generated after a micro lens array ( MLA) by a star is compared to the pattern of one of the three calibration sources that is included in the WFS, allowing in flight calibration. We show the robust and lightweight opto mechanical design that is optimised for launch and cryogenic operation. Details are given on its alignment and commissioning. The WFS is able to measure relative wave front distortions in the order of lambda/1000, and can determine the optimum position of the focal plane with an accuracy of 50 μm

Paper Details

Date Published: 20 November 2017
PDF: 7 pages
Proc. SPIE 10565, International Conference on Space Optics — ICSO 2010, 105650L (20 November 2017); doi: 10.1117/12.2309234
Show Author Affiliations
Amir Vosteen, TNO Science and Industry (Netherlands)
Folkert Draaisma, TNO Science and Industry (Netherlands)
Willem van Werkhoven, TNO Science and Industry (Netherlands)
Luud van Riel, TNO Science and Industry (Netherlands)
Margreet Mol, TNO Science and Industry (Netherlands)
Wim Gielesen, TNO Science and Industry (Netherlands)

Published in SPIE Proceedings Vol. 10565:
International Conference on Space Optics — ICSO 2010
Errico Armandillo; Bruno Cugny; Nikos Karafolas, Editor(s)

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