21 July 2014 A software based de-rotation algorithm concept for the new adaptive optics module (NAOMI) for the auxiliary telescopes of the VLTI
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Abstract
The New Adaptive Optics Module for Interferometry (NAOMI) is the future low order Adaptive optics system to be developed for and installed at the ESO 1.8 m Auxiliary Telescopes (ATs). The four ATs are designed for interferometry which they are essentially dedicated for. The project goal is to equip the telescopes with a low-order Shack-Hartmann system operating in the visible in place of the current tip-tilt correction. The deformable mirror (DM) for NAOMI is rotating with the AT azimuth axis whereas the wavefront sensor (WFS), which signals are used to control the DM, has a fixed position in the telescope basement. It is not co-rotating with the DM. The result is that the projection of the actuator pattern is rotating with respect to the WFS when the telescope is tracking an object on sky. In order to avoid the use of an optical de-rotator we developed an algorithm to de-rotate the commands to the DM in software. This paper outlines the concept of the software de-rotation as well as the performance obtained from end-to-end simulations.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emmanuel Aller-Carpentier, Emmanuel Aller-Carpentier, Enrico Marchetti, Enrico Marchetti, Reinhold Dorn, Reinhold Dorn, Françoise Delplancke-Stroebele, Françoise Delplancke-Stroebele, Enrico Fedrigo, Enrico Fedrigo, Miska Le Louarn, Miska Le Louarn, Norbert Hubin, Norbert Hubin, Jérome Paufique, Jérome Paufique, Julien Woillez, Julien Woillez, } "A software based de-rotation algorithm concept for the new adaptive optics module (NAOMI) for the auxiliary telescopes of the VLTI", Proc. SPIE 9148, Adaptive Optics Systems IV, 91484A (21 July 2014); doi: 10.1117/12.2055072; https://doi.org/10.1117/12.2055072
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