Smart warping harnesses for active mirrors and stress polishing

Sabri Lemared; Emmanuel Hugot; Zalpha Challita; Hermine Schnetler; Gabby Kroes; Michel Marcos; Anne Costille; Kjetil Dohlen; Jean-Luc Beuzit; Jean-Gabriel Cuby

doi:10.1117/12.2232388

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22 July 2016 Smart warping harnesses for active mirrors and stress polishing

Sabri Lemared, Emmanuel Hugot, Zalpha Challita, Hermine Schnetler, Gabby Kroes, Michel Marcos, Anne Costille, Kjetil Dohlen, Jean-Luc Beuzit, Jean-Gabriel Cuby

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Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991267 (2016) https://doi.org/10.1117/12.2232388
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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, and 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); https://doi.org/10.1117/12.2232388

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