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Providing traceability for ESA’s FORUM Mission with PTB’s Reduced Background Calibration Facility 2

Authors

Monte,  Christian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Adibekyan,  Albert
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fehse,  Dirk
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gieseler,  Julian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Narezo Guzmán,  Daniela
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Reiniger,  Max
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Schumacher,  Jamy
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Vanin,  Felice
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Serlenga,  Damiano
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Laberinti,  Paolo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Monte, C., Adibekyan, A., Fehse, D., Gieseler, J., Narezo Guzmán, D., Reiniger, M., Schumacher, J., Vanin, F., Serlenga, D., Laberinti, P. (2023): Providing traceability for ESA’s FORUM Mission with PTB’s Reduced Background Calibration Facility 2, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4420


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021850
Abstract
ESA’s 9th earth explorer mission Far-Infrared Outgoing Radiation Understanding and Monitoring (FORUM) aims to perform for the first time spectrally resolved, traceable measurements of Earth’s OLR in the wavelength range from 6 µm to 100 µm over extended time periods. These measurements will provide precise information about the outgoing energy and further data which are relevant for climate research, modeling, and prediction. So far, spectral measurements up to 17 µm have been realized. However, about half of Earth’s outgoing total energy is found at wavelengths beyond 15 µm, making the FIR range of critical importance for Earth’s energy budget and thus for climate evolution. FORUM aims to close the data gap with a targeted absolute uncertainty of 30 mK (k = 1) in spectral radiation temperature equivalent. PTB will support FORUM with the traceable calibration of its on-board reference source under vacuum via its Reduced Background Calibration Facility 2 (RBCF2). An absolute radiometric uncertainty of 30 mK in radiation temperature requires an FIR laboratory reference source with an absolute uncertainty of 15 mK or less, which is beyond currently available reference sources, not only for the FIR, but also for the MIR and NIR. Additionally, to reach the challenging radiometric target uncertainty background radiation must be accounted for and actively controlled. Consequently, the development of a new reference blackbody for FIR calibrations under vacuum in combination with a precisely temperature controlled, and uniform scenery are necessary. Both the new Variable Reference Blackbody (VRBB) and the so-called Cold screen are presented.