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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021850 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021850_1
Genre: Conference Paper

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 Creators:
Monte, Christian1, Author
Adibekyan, Albert1, Author
Fehse, Dirk1, Author
Gieseler, Julian1, Author
Narezo Guzmán, Daniela1, Author
Reiniger, Max1, Author
Schumacher, Jamy1, Author
Vanin, Felice1, Author
Serlenga, Damiano1, Author
Laberinti, Paolo1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
 Publishing info: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4420
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -