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9 September 2019 An in-flight calibration assembly for the earth observation instrument Sentinel-4 UVN
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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.
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© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Clermont, E. Mazy, B. Marquet, and J. Y. Plesseria "An in-flight calibration assembly for the earth observation instrument Sentinel-4 UVN", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160I (9 September 2019); https://doi.org/10.1117/12.2529572
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