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An in-flight calibration assembly for the earth observation instrument Sentinel-4 UVN
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Paper Abstract

An in-orbit calibration assembly is designed and tested to ensure the radiometric accuracy of Sentinel-4/UVN. One of the calibration method consists in measuring the Sun’s irradiance through a diffuser. A major challenge was the apparition of so-called spectral features, which come from speckle patterns due to the thin spectral bands of the instrument. A stack of diffuser was built to increase the average optical path difference above coherence length, thus decreasing the speckle contrast. A unique spectral feature test bench has been developed to validate the performance. A second calibration approach consists in illuminating the instrument with a white light source whose drift is characterized and limited. This paper discusses the design of the calibration assembly and the challenge which were encountered in the process. Also, on-ground tests results are presented, including the description of the test setup, in particular the spectral feature test bench.

Paper Details

Date Published: 9 September 2019
PDF: 8 pages
Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160I (9 September 2019); doi: 10.1117/12.2529572
Show Author Affiliations
L. Clermont, Ctr. Spatial de Liège (Belgium)
E. Mazy, Ctr. Spatial de Liège (Belgium)
B. Marquet, Ctr. Spatial de Liège (Belgium)
J. Y. Plesseria, Ctr. Spatial de Liège (Belgium)


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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