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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-343
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-343
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Sep 2020

09 Sep 2020

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This preprint is currently under review for the journal AMT.

Prediction Model for Diffuser Induced Spectral Features in Imaging Spectrometers

Florian Richter1,2, Corneli Keim2, Jérôme Carona, Jasper Krauser2, Dennis Weise2, and Mark Wenig1 Florian Richter et al.
  • 1Meteorological Institute LMU Munich, Theresienstr. 37, Munich, Germany
  • 2Airbus Defence and Space GmbH, Willy-Messerschmitt-Str. 1, 82024 Taufkirchen, Germany
  • anow at: TNO, Optics Department, Stieltjesweg 1, 2628 CK Delft, the Netherlands

Abstract. Wide-field spectrometers for Earth Observation missions require inflight radiometric calibration, for which the sun can be used as a known reference. Therefor a diffuser is placed in front of the spectrometer in order to scatter the incoming light into the entrance slit and provide homogeneous illumination. The diffuser however, introduces interference patterns known as speckles into the system, yielding potentially significant intensity variations at the detector plane, called Spectral Features.

There have been several approaches implemented to characterize the Spectral Features of a spectrometer, e.g. end-to-end measurements with representative instruments. Additionally, in previous publications a measurement technique was proposed, which is based on the acquisition of monochromatic speckles in the entrance slit following a numerical propagation through the disperser to the detection plane. Based on this measurement technique we present a standalone prediction model for the magnitude of Spectral Features in imaging spectrometers, requiring only few input parameters and therefor mitigating the need for expensive measurement campaigns.

Florian Richter et al.

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Latest update: 27 Nov 2020
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Short summary
Much effort has been put into obtaining crucial information about the progress of climate change and its main contributors such as tracegases like CO2, Methane or aerosols. Satelitte-based spectrometer instruments, that analyze the light spectrum reflected by the earth are frequently sent into orbit to achieve this task. This work contributes a solution to a long known calibration problem and could significantly reduce overhead in future planning phases of such instruments and their performance.
Much effort has been put into obtaining crucial information about the progress of climate change...
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