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Proceedings Paper

Optical measurements of the mirrors and of the interferential filter of the Metis coronagraph on Solar Orbiter
Author(s): P. Sandri; P. Sarra; P. Radaelli; D. Morea; R. Melich; A. Berlicki ; E. Antonucci; M. M. Castronuovo; S. Fineschi; G. Naletto; G. Nicolini; M. Romoli
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Paper Abstract

The paper describes the wavefront error measurements of the concave ellipsoidal mirrors M1 and M2, of the concave spherical mirror M0 and of the flat interferential filter IF of the Metis coronagraph. Metis is an inverted occultation coronagraph on board of the ESA Solar Orbiter mission providing a broad-band imaging of the full corona in linearly polarized visible-light (580 - 640 nm) and a narrow-band imaging of the full corona in the ultraviolet Lyman α (121.6 nm). Metis will observe the solar outer atmosphere from a close distance to the Sun as 0.28 A.U. and from up to 35deg out-of-ecliptic. The measurements of wavefront error of the mirrors and of the interferential filter of Metis have been performed in a ISO5 clean room both at component level and at assembly level minimizing, during the integration, the stress introduced by the mechanical hardware. The wavefront error measurements have been performed with a digital interferometer for mirrors M0, M1 and M2 and with a Shack-Hartmann wavefront sensor for the interferential filter.

Paper Details

Date Published: 29 August 2017
PDF: 12 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 1039716 (29 August 2017); doi: 10.1117/12.2275416
Show Author Affiliations
P. Sandri, OHB Italia (Italy)
P. Sarra, OHB Italia (Italy)
P. Radaelli, OHB Italia (Italy)
D. Morea, OHB Italia (Italy)
R. Melich, Institute of Plasma Physics (Czech Republic)
A. Berlicki , Astronomical Institute (Czech Republic)
E. Antonucci, INAF - Astrophysical Observatory of Torino (Italy)
M. M. Castronuovo, Agenzia Spaziale Italiana (Italy)
S. Fineschi, INAF - Astrophysical Observatory of Torino (Italy)
G. Naletto, Univ. of Padova (Italy)
CNR-IFN UOS Padova LUXOR (Italy)
G. Nicolini, INAF - Astrophysical Observatory of Torino (Italy)
M. Romoli, Univ. of Florence (Italy)


Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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