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Proceedings Paper

The calibration unit of the mid-infrared E-ELT instrument METIS
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Paper Abstract

We present the preliminary design of the calibration unit of the future E-ELT instrument METIS. This independent subunit is mounted externally to the main cryostat of METIS and will function both as calibration reference for science observations, as well as verification and alignment tool during the AIT phase. In this paper, we focus on describing its preliminary layout and foreseen functionalities, based on the performance requirements defined at system level and the constraints imposed by warm IR background. We discuss the advantage of employing an integrating sphere as common radiation emitter, leading to a novel and versatile design, where the source’s spatio-spectral properties can be varied with high fidelity and repeatability. By combining only few tuneable sources and mechanisms we show how a large instrument such as METIS can be calibrated and tested, without the need of a complex cold calibration unit.

Paper Details

Date Published: 11 July 2018
PDF: 11 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070291 (11 July 2018); doi: 10.1117/12.2312075
Show Author Affiliations
Nicola Baccichet, Univ. zu Köln (Germany)
Lucas Labadie, Univ. zu Köln (Germany)
Steffen Rost, Univ. zu Köln (Germany)
Christian Straubmeier, Univ. zu Köln (Germany)
Michael Wiest, Univ. zu Köln (Germany)
Leonard Burtscher, Leiden Observatory, Leiden Univ. (Netherlands)
NOVA Optical Infrared Instrumentation Group (Netherlands)
Tibor Agócs, NOVA Optical Infrared Instrumentation Group (Netherlands)
Willem Jellema, NOVA Optical Infrared Instrumentation Group (Netherlands)
Ronald Roelfsema, NOVA Optical Infrared Instrumentation Group (Netherlands)
Roy van Boekel, Max-Planck-Institut für Astronomie (Germany)
Adrian Glauser, ETH Zurich (Switzerland)
Bernhard Brandl, Leiden Observatory, Leiden Univ. (Netherlands)
Felix Bettonvil, Leiden Observatory, Leiden Univ. (Netherlands)
Jeff Lynn, NOVA Optical Infrared Instrumentation Group (Netherlands)
Andreas Eckart, Univ. zu Köln (Germany)
Max-Planck-Institut für Radioastronomie (Germany)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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