Preliminary results on the EUCLID NISP stray-light and ghost analysis

Norbert Geis; Frank Grupp; Eric Prieto; Ralf Bender

doi:10.1117/12.2187948

22 September 2015 Preliminary results on the EUCLID NISP stray-light and ghost analysis

Norbert Geis, Frank Grupp, Eric Prieto, Ralf Bender

Proceedings Volume 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII; 96020H (2015) https://doi.org/10.1117/12.2187948
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The EUCLID mission within the European Space Agencies 2015 - 2025 Cosmic Vision framework addresses cosmological questions related to dark matter and dark energy. EUCLID is equipped with two instruments that are simultaneously observing patches of > 0:5 square degree on the sky. The VIS visual light high spacial resolution imager and the NISP near infrared spectrometer and photometer are separated by a di-chroic beam splitter. With its large FoV (larger than the full moon disk), together with high demands on the optical performance and strong requirements on in flight stability lead to very challenging demands on alignment and post launch { post cool-down optical element position. In addition the demanding requirements from spectroscopy and galaxy photometry lead to a highly demanding stray light and ghost control need. With this paper we present a preliminary - PDR level - analysis of ghosting and stray light levels in the EUCLID NISP near infrared spectrometer and photometer. The analysis presented focuses on the photometric channel, as this, together with the wide field of the instrument, shows most of the challenges and features of the instrument. As one requirement is to have a non vignetting design, extensive baffling is not possible, and only secondary and higher order light can be actively baffled. A comprehensive ZEMAX based analysis is being presented, showing in summary that baffles are only necessary due to the EUCLID fine guiding sensors auxiliary fields of view. The total level of contaminating light is thereafter dominated by stray light from dust on the lenses. Ghosts play a minor role.

Citation Download Citation

Norbert Geis, Frank Grupp, Eric Prieto, and Ralf Bender "Preliminary results on the EUCLID NISP stray-light and ghost analysis", Proc. SPIE 9602, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII, 96020H (22 September 2015); https://doi.org/10.1117/12.2187948

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KEYWORDS

Sensors

Stray light

Spectroscopy

Photometry

Galactic astronomy

Image sensors

Lenses

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