As an example, we describe the results obtained measuring the primary mirror segments of the Cherenkov prototypal telescope manufactured by the Italian National Institute for Astrophysics in the context of the ASTRI Project. This specific case is challenging because the segmentation of the polynomial primary mirror lead to individual mirrors with deviations from the spherical optical design up to a few millimeters.
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Giorgia Sironi, Rodolfo Canestrari, Giovanni Pareschi, Carlo Pelliciari, "Deflectometry for optics evaluation: free form segments of polynomial mirror," Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510T (28 July 2014);