| Zugriffsnummer | 45606 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | FORUM payload study for phase A/B1 by a consortium led by OHB System AG and TAS-UK |
| Autor(in); Institution |
Fray, S.; OHB System AG, Weßling, GERMANY
Lippa, M.; OHB System AG, Weßling, GERMANY
Semmler, E.; OHB System AG, Weßling, GERMANY
Posselt, W.; OHB System AG, Weßling, GERMANY
Giaccari, Ph.; Micos Engineering GmbH, Dübendorf, SWITZERLAND
Mastrandrea, C.; LEONARDO, Campi Bisenzio (FI), ITALY
Zeitner, U. W.; Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF, Jena, GERMANY
Fluegel-Paul, Th.; Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF, Jena, GERMANY
Sadlowski, S.; Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF, Jena, GERMANY
Kaesebier, Th.; Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF, Jena, GERMANY
Monte, Christian; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin
Kehrt, Mathias; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin
|
| Quelle/Jahr | International Conference on Space Optics - ICSO 2020:(2021), 1185225-1 - 1185225-19 |
| Schriftenreihe | Proceedings of SPIE: 11852 |
| Availability | [online only] |
| Herausgeber(in) |
Cugny, Bruno
Sodnik, Zoran
Karafolas, Nikos
|
| ISSN | 0277-786X (PRINT) ; 1996-756X (ONLINE) |
| DOI | |
| Verlag | Bellingham, Wash.: SPIE |
| Konferenzangaben | International Conference on Space Optics (ICSO), Virtual Conference, 30 March - 02 April 2021 |
| Freie Schlagworte | interferometer |
| Zusammenfassung | In 2019, the FORUM mission (Far-infrared Outgoing Radiation Understanding and Monitoring) has been selected by ESA as Earth Explorer 9 mission. FORUM aims to record the emission spectrum of the Earth’s stratosphere and troposphere in the spectral range of 100 to 1600 cm-1 (i.e. 6.25μm to 100 μm). It will measure the spectral features of the far-infrared contribution to the Earth radiation budget with the focus on the water vapour contribution, the cirrus cloud properties, and the ice/snow surface emissivity. FORUM’s primary optical instrument is a non-imaging Fourier Transform Spectrometer (FTS) scanning the Earth atmosphere in a step-and-stare acquisition mode sounding a 15 km ground sampling with a ground sampling distance of 100 km. Key requirements are the spectral resolution (0.5 cm-1), the absolute radiometric accuracy (0.1 K for 300-1100 cm-1 at 3sigma confidence level) and the noise equivalent spectral radiance (0.4 mW/(m2 sr cm-1) for 200-800 cm-1). To ensure the feasibility for the FORUM mission dedicated pre-development activities have been initiated in phase A preparatory study to provide sufficient maturity of the required technologies. The following items have been identified as critical pre-developments: beam splitter, detector chain, on-board calibration black body and the interferometer mechanism. A consortium led by TAS-UK as mission and platform prime and OHB as instrument prime are currently developing the satellite and payload together with Leonardo Italy and MICOS during an ESA paid phase A / B1 study. This consortium is one of the 2 independent consortia selected for FORUM’s phase A/B1. The paper will describe the design concept of the FORUM FTS instrument with main focus on the optical design. The key optical subsystems are the pointing unit and a double pendulum interferometer with an entrance three-mirror-anastigmatic telescope. The prediction of the performance with respect to threshold and goal requirements will be presented. Furthermore, the status of the beam splitter pre-development will be reported, in particular the development of an optical element based on a CVD-diamond substrate and a technology to manufacture broad band anti-reflective microstructures on a diamond surface. The microstructures are designed to suppress parasitic reflections in the spectral range between 6.25μm and 100μm. The highest efficiency occurs between 13 and 30μm, where the Fresnel reflection is reduced from 17% down to below 3.5%. |
| Themenbereich der Metrologie | Photometrie und Radiometrie |
| Forschungsprojekt | ESA funded through the Earth Explorer 9 program |
| Förderinformationen (1) |
Förderername: European Space Agency (ESA)
Förderer ID: 0000 0004 0623 6946 Förderer ID Typ: ISNI Förderprogramm: Earth Explorer 9 program Titel der Förderung: FORUM Payload Study |
Zitierung
Fray, S., Lippa, M., Semmler, E., Posselt, W., Giaccari, P., Mastrandrea, C., Zeitner, U. W., Fluegel-Paul, T., Sadlowski, S., Kaesebier, T., Monte, C., & Kehrt, M. (2021). FORUM payload study for phase A/B1 by a consortium led by OHB System AG and TAS-UK. International Conference on Space Optics (ICSO), Virtual Conference, 30 March - 02 April 2021. https://doi.org/10.1117/12.2599356