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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24293
Title: Stray-light analyses of the METIS coronagraph on Solar Orbiter
Authors: FINESCHI, Silvano 
Sandri, Paolo
LANDINI, Federico 
ROMOLI, MARCO
DaDeppo, Vania
FRASSETTO, FABIO
Verroi, Enrico
Naletto, Giampiero
Morea, Danilo
Antonucci, Ester
SPADARO, Daniele 
ANDRETTA, Vincenzo 
Issue Date: 2015
Volume: Solar Physics and Space Weather Instrumentation VI
Editors: Fineschi, Silvano; Fennelly, Judy
Series: PROCEEDINGS OF SPIE 
Number: 9604
First Page: 96040K-1
Abstract: The METIS coronagraph on board the Solar Orbiter mission will have the unique opportunity of observing the solar outer atmosphere as close to the Sun as 0.28 A.U., and from up to 35° out-of-ecliptic. The telescope design of the METIS coronagraph includes two optical paths: i) broad-band imaging of the full corona in linearly polarized visible-light (VL: 580-640 nm), ii) narrow-band imaging of the full corona in the ultraviolet (UV) Lyman α (121.6 nm). This paper describes the stray-light analyses performed on the UV and VL channels of the METIS Telescope with the nonsequential modality of Zemax OpticStudio. A detailed opto-mechanical model of the METIS Telescope is simulated by placing the CAD parts of all the sub-assemblies at the nominal position. Each surface, mechanical and optical, is provided with a modelled coating and BSDF reproducing the optical and the diffusing properties. The geometric model allows for the verification of the correct functioning of the blocking elements inside the telescope and for an evaluation of the stray-light level due to surface roughness. The diffraction off the inner edge of the IEO on the plane of the IO is modelled separately from the contributor of the surface micro-roughness. The contributors due to particle contamination and cosmetic defects are also analysed. The results obtained are merged together and compared to the requirements of stray-light. The results of this analysis together with those from two different analyses based on a Montecarlo ray-trace and a semi-analytical model are consistent with each other and indicate that the METIS design meets the stray-light level requirements
Conference Name: Solar Physics and Space Weather Instrumentation VI
Conference Place: San Diego, CA, USA
Conference Date: 9-13 August, 2015
URI: http://hdl.handle.net/20.500.12386/24293
URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9604/1/Stray-light-analyses-of-the-METIS-coronagraph-on-Solar-Orbiter/10.1117/12.2203629.short?SSO=1
ISSN: 0277-786X
ISBN: 9781628417708
DOI: 10.1117/12.2203629
Bibcode ADS: 2015SPIE.9604E..0KF
Fulltext: open
Appears in Collections:3.01 Contributi in Atti di convegno

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