Optical measurements of the mirrors and of the interferential filter of the Metis coronagraph on Solar Orbiter

0485005 - ASÚ 2018 RIV US eng C - Conference Paper (international conference)
Sandri, P. - Sarra, P. - Radaelli, P. - Morea, D. - Melich, Radek - Berlicki, Arkadiusz - Antonucci, E. - Castronuovo, M.M. - Fineschi, S. - Naletto, G. - Nicolini, G. - Romoli, M.
Optical measurements of the mirrors and of the interferential filter of the Metis coronagraph on Solar Orbiter.
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX. Bellingham: SPIE, 2017, 1039716/1-1039716/12. Proceedings of SPIE, 10397. ISBN 9781510612518. ISSN 0277-786X.
[Conference on UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy /20./. San Diego (US), 06.08.2017-08.08.2017]
Institutional support: RVO:67985815 ; RVO:61389021
Keywords : wavefront error * mirrors * interferential filter
OECD category: Astronomy (including astrophysics,space science); Electrical and electronic engineering (UFP-V)

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 alpha (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.
Permanent Link: http://hdl.handle.net/11104/0280130