Interferometry at the pillars of Hercules: or measurements in high holes density, low reflectivity, low modulation regime

Runa Briguglio; Nicolò Azzaroli; Giorgio Pariani; Luca Oggioni; Chiara Selmi; Marco Xompero; Armando Riccardi; Matteo Tintori; Daniele Gallieni

doi:10.1117/12.2628725

29 August 2022 Interferometry at the pillars of Hercules: or measurements in high holes density, low reflectivity, low modulation regime

Runa Briguglio, Nicolò Azzaroli, Giorgio Pariani, Luca Oggioni, Chiara Selmi, Marco Xompero, Armando Riccardi, Matteo Tintori, Daniele Gallieni

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121856Y (2022) https://doi.org/10.1117/12.2628725
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We investigate the interferometric measure-ability of the silicon carbide Reference Body of the ELT adaptive mirror M4. The sampling is technically challenging, because of the low fringes modulation due to poor surface finish and to the extremely large number of holes in the aperture. We describe our approach to face and solve such criticalities, based on laboratory experimentations with a Twyman Green interferometer on a dedicated optical setup; we comment the feasibility of such measurement in a real environment and present in the end a checklist to enable interferometer measurements in such unfavourable conditions.

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Runa Briguglio, Nicolò Azzaroli, Giorgio Pariani, Luca Oggioni, Chiara Selmi, Marco Xompero, Armando Riccardi, Matteo Tintori, and Daniele Gallieni "Interferometry at the pillars of Hercules: or measurements in high holes density, low reflectivity, low modulation regime", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121856Y (29 August 2022); https://doi.org/10.1117/12.2628725

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