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Proceedings Paper

Testing the near-infrared optical assembly of the space telescope Euclid
Author(s): Christof Bodendorf; Norbert Geis; Frank Grupp; Jennifer Kaminski; Reinhard Katterloher; Ralf Bender
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Paper Abstract

Euclid is a space telescope currently developed in the framework of the ESA Cosmic Vision 2015-2025 Program. It addresses fundamental cosmological questions related to dark matter and dark energy. The lens system of one of the two scientific key instruments [a combined near-infrared spectrometer and photometer (NISP)] was designed, built-up and tested at the Max Planck Institute for Extraterrestrial Physics (MPE). We present the final imaging quality of this diffraction-limited optical assembly with two complementary approaches, namely a point-spread function- and a Shack- Hartmann sensor-based wavefront measurement. The tests are performed under space operating conditions within a cryostat. The large field of view of Euclid’s wide-angle objective is sampled with a pivot arm, carrying a measurement telescope and the sensors. A sequence of highly accurate movements to several field positions is carried out by a large computer controlled hexapod. Both measurement approaches are compared among one another and with the corresponding simulations. They demonstrate in good agreement a solely diffraction limited optical performance over the entire field of view.

Paper Details

Date Published: 9 September 2019
PDF: 22 pages
Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160Y (9 September 2019); doi: 10.1117/12.2529114
Show Author Affiliations
Christof Bodendorf, Max-Planck-Institut für extraterrestrische Physik (Germany)
Norbert Geis, Max-Planck-Institut für extraterrestrische Physik (Germany)
Frank Grupp, Univ.-Sternwarte München (Germany)
Max-Planck-Institut für extraterrestrische Physik (Germany)
Jennifer Kaminski, Max-Planck-Institut für extraterrestrische Physik (Germany)
Reinhard Katterloher, Max-Planck-Institut für extraterrestrische Physik (Germany)
Ralf Bender, Max-Planck-Institut für extraterrestrische Physik (Germany)
Univ.-Sternwarte München (Germany)

Published in SPIE Proceedings Vol. 11116:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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