The warm calibration unit of METIS: optical design and principle of operation

Christian Straubmeier, Nicola Baccichet, Lucas Labadie, Steffen Rost, Michael Wiest, Andreas Eckart, Bernhard Brandl, Tibor Agócs, Ronald Roelfsema, Jeffrey Lynn, Felix Bettonvil

Research output: Contribution to conferencePaperScientific


METIS, a mid-infrared imager and spectrograph for the wavelength range 2.9-19μm (astronomical L-, M-, N- and Q-band), will be one of the first three science instruments at the European Extremely Large Telescope (E-ELT). It will provide diffraction limited imaging, coronagraphy, high resolution integral field spectroscopy and low and medium resolution slit spectroscopy. Within the international METIS consortium, the 1st Institute of Physics of the University of Cologne in Germany is responsible for the design, manufacturing, integration and qualification of the Warm Calibration Unit (WCU) of the instrument. The WCU will be a self-contained unit operating at ambient temperature outside of the voluminous METIS dewar, feeding a variety of optical calibration and alignment signals into the optical path of METIS. The functionalities of the WCU will be used for routine daily daytime calibrations after astronomical observing nights and verification of the internal alignment of METIS during assembly, integration and verification (AIV). In this contribution we present the preliminary optical design and principle of operation of the WCU in its current state of the preliminary design phase of METIS.
Original languageEnglish
Number of pages7
Publication statusPublished - 2018
Externally publishedYes
EventSPIE astronomical telescopes and instrumentation 2018 - Austin, United States
Duration: 10 Jun 201815 Jun 2018


ConferenceSPIE astronomical telescopes and instrumentation 2018
Country/TerritoryUnited States


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