Dr. Joerg Reichardt Profile

Dr. Joerg Reichardt

at Univ Würzburg

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Proceedings Article | 5 September 2017 Presentation + Paper

The Sentinel-4 UVN focal plane assemblies

Jürgen Hinger, Rüdiger Hohn, Eyk Gebhardt, Jörg Reichardt

Proceedings Volume 10402, 1040217 (2017) https://doi.org/10.1117/12.2274344

KEYWORDS: Staring arrays, Gases, Mirrors, Reflector telescopes, Telescopes

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The Sentinel-4 UVN Instrument is a dispersive imaging spectrometer covering the UV-VIS and the NIR wavelength. It is developed and built under an ESA contract by an industrial consortium led by Airbus Defence and Space. It will be accommodated on board of the MTG-S (Meteosat Third Generation - Sounder) satellite that will be placed in a geostationary orbit over Europe sampling data for generating two-dimensional maps of a number of atmospheric trace gases. The incoming light is dispersed by reflective gratings and detected by the two (UVVIS and NIR) CCDs mounted inside the focal plane assemblies. Both CCD detectors acquire spectral channels and spatial sampling in two orthogonal directions and will be operated at about 215 K mainly to minimize random telegraph signal effects and to reduce dark current. Stringent detector temperature as well as alignment stability requirements of less than ±0.1 K per day respectively of less than 2 micrometers/2 arcseconds from ground to orbit are driving the FPA thermo-mechanical design. A specific FPA design feature is the redundant LED-calibration system for bad pixel detection as well as pixel gain and linearity monitoring. This paper reports on the design and qualification of the Focal Plane Assemblies with emphasis on thermo-mechanical as well as alignment stability verification.

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