Title
Wavefront sensor for the ESA-GAIA mission
Author
TNO Industrie en Techniek
Vosteen, L.L.A.
Draaisma, F.
Werkhoven, W.P.
Riel, L.J.M.
Mol, M.H.
Den, O.G.
Contributor
Warren, P.G. (editor)
Marshall, C.J. (editor)
Tyson, R.K. (editor)
Lloyd-Hart, M. (editor)
Heaney, J.B. (editor)
Kvamme, E.T. (editor)
Publication year
2009
Abstract
TNO developed a Wave Front Sensor (WFS) instrument for the GAIA mission. This Wave Front Sensor will be used to monitor the wave front errors of the two main telescopes mounted on the GAIA satellite, which may be corrected by a 5- degree of freedom (DOF) mechanism 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. Furthermore we give details on its alignment and commissioning. The WFS can measure wave front distortions in the order of lambda/1000, and determines the focal plane with an accuracy of 50 μm. © 2009 SPIE.
Subject
Cryogenic
Exoplanets
INVAR
Opto mechanical
Shack hartmann
Wave front sensor
To reference this document use:
http://resolver.tudelft.nl/uuid:d95f1a24-8281-4142-8d3d-f082ec1ece34
DOI
https://doi.org/10.1117/12.825240
TNO identifier
248221
ISSN
0277-786X
Source
Astronomical and Space Optical Systems, 2 August 2009 through 3 August 2009, San Diego, CA, 7439 (7439)
Series
Proceedings of SPIE - The International Society for Optical Engineering
Document type
conference paper