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Proceedings Paper

Metrology calibration and very high accuracy centroiding with the NEAT testbed
Author(s): A. Crouzier; F. Malbet; O. Preis; F. Henault; P. Kern; G. Martin; P. Feautrier; E. Stadler; S. Lafrasse; A. Delboulbe; E. Behar; M. Saint-Pe; J. Dupont; S. Potin; C. Cara; M. Donati; E. Doumayrou; P. O. Lagage; A. Léger; J. M. Le Duigou; M. Shao; R. Goullioud
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Paper Abstract

NEAT is an astrometric mission proposed to ESA with the objectives of detecting Earth-like exoplanets in the habitable zone of nearby solar-type stars. NEAT requires the capability to measure stellar centroids at the precision of 5 x 10-6 pixel. Current state-of-the-art methods for centroid estimation have reached a precision of about 2 x 10-5 pixel at two times Nyquist sampling, this was shown at the JPL by the VESTA experiment. A metrology system was used to calibrate intra and inter pixel quantum efficiency variations in order to correct pixelation errors. The European part of the NEAT consortium is building a testbed in vacuum in order to achieve 5 x 10-6 pixel precision for the centroid estimation. The goal is to provide a proof of concept for the precision requirement of the NEAT spacecraft. The testbed consists of two main sub-systems. The first one produces pseudo stars: a blackbody source is fed into a large core fiber and lights-up a pinhole mask in the object plane, which is imaged by a mirror on the CCD. The second sub-system is the metrology, it projects young fringes on the CCD. The fringes are created by two single mode fibers facing the CCD and fixed on the mirror. In this paper we present the experiments conducted and the results obtained since July 2013 when we had the first light on both the metrology and pseudo stars. We explain the data reduction procedures we used.

Paper Details

Date Published: 2 August 2014
PDF: 16 pages
Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91434S (2 August 2014); doi: 10.1117/12.2056956
Show Author Affiliations
A. Crouzier, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Malbet, Institut de Planétologie et d’Astrophysique de Grenoble (France)
O. Preis, Institut de Planétologie et d’Astrophysique de Grenoble (France)
F. Henault, Institut de Planétologie et d’Astrophysique de Grenoble (France)
P. Kern, Institut de Planétologie et d’Astrophysique de Grenoble (France)
G. Martin, Institut de Planétologie et d’Astrophysique de Grenoble (France)
P. Feautrier, Institut de Planétologie et d’Astrophysique de Grenoble (France)
E. Stadler, Institut de Planétologie et d’Astrophysique de Grenoble (France)
S. Lafrasse, Institut de Planétologie et d’Astrophysique de Grenoble (France)
A. Delboulbe, Institut de Planétologie et d’Astrophysique de Grenoble (France)
E. Behar, Institut de Planétologie et d’Astrophysique de Grenoble (France)
M. Saint-Pe, Institut de Planétologie et d’Astrophysique de Grenoble (France)
J. Dupont, Institut de Planétologie et d’Astrophysique de Grenoble (France)
S. Potin, Institut de Planétologie et d’Astrophysique de Grenoble (France)
C. Cara, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
M. Donati, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
E. Doumayrou, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
P. O. Lagage, Commissariat à l'Énergie Atomique et aux Energies Alternatives (France)
A. Léger, Institut d'Astrophysique Spatiale, Ctr. Univ. d'Orsay (France)
J. M. Le Duigou, Ctr. National d'Études Spatiales (France)
M. Shao, Jet Propulsion Lab. (United States)
R. Goullioud, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 9143:
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark Clampin; Giovanni G. Fazio; Howard A. MacEwen, Editor(s)

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