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Proceedings Paper

The Euclid near-infrared calibration source
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Paper Abstract

The Euclid dark energy mission is currently competing in ESA's Cosmic Vision program. Its imaging instrument, which has one visible and one infrared channel, will survey the entire extragalactic sky during the 5 year mission. The near-infrared imaging photometer (NIP) channel, operating in the ~0.92 - 2.0 μm spectral range, will be used in conjunction with the visible imaging channel (VIS) to constrain the nature of dark energy and dark matter. To meet the stringent overall photometric requirement, the NIP channel requires a dedicated on-board flat-field source to calibrate the large, 18 detector focal plane. In the baseline concept a 170 mm Spectralon diffuser plate, mounted to a pre-existing shutter mechanism outside the channel, is used as a flat-field calibration target, negating the need for an additional single-point-failure mechanism. The 117 × 230 mm focal plane will therefore be illuminated through all of the channel's optical elements and will allow flat-field measurements to be taken in all wavelength bands. A ring of low power tungsten lamps, with custom reflecting elements optimized for optical performance, will be used to illuminate the diffuser plate. This paper details the end-to-end optical simulations of this concept, a potential mechanical implementation and the initial tests of the proposed key components.

Paper Details

Date Published: 10 August 2010
PDF: 11 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77312V (10 August 2010); doi: 10.1117/12.857038
Show Author Affiliations
Rory Holmes, Max-Planck-Institut für Astronomie (Germany)
Peter Bizenberger, Max-Planck-Institut für Astronomie (Germany)
Oliver Krause, Max-Planck-Institut für Astronomie (Germany)
Mario Schweitzer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Adrian M. Glauser, ETH Zurich (Switzerland)
UK Astronomy Technology Ctr. (United Kingdom)

Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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