22 July 2016 Smart warping harnesses for active mirrors and stress polishing
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Abstract
We present two ways to generate or compensate for first order optical aberrations using smart warping harnesses. In these cases, we used the same methodology leading to replace a previous actuation system currently on-sky and to get a freeform mirror intended to a demonstrator. Starting from specifications, a warping harness is designed, followed by a meshing model in the finite elements software. For the two projects, two different ways of astigmatism generation are presented. The first one, on the VLT-SPHERE instrument, with a single actuator, is able to generate a nearly pure astigmatism via a rotating motorization. Two actuators are sufficient to produce the same aberration for the active freeform mirror, main part of the OPTICON-FAME project, in order to use stress-polishing method.
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Sabri Lemared, Emmanuel Hugot, Zalpha Challita, Hermine Schnetler, Gabby Kroes, Michel Marcos, Anne Costille, Kjetil Dohlen, Jean-Luc Beuzit, Jean-Gabriel Cuby, "Smart warping harnesses for active mirrors and stress polishing", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991267 (22 July 2016); doi: 10.1117/12.2232388; https://doi.org/10.1117/12.2232388
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