A software based de-rotation algorithm concept for the new adaptive optics module (NAOMI) for the auxiliary telescopes of the VLTI

Emmanuel Aller-Carpentier; Enrico Marchetti; Reinhold Dorn; Françoise Delplancke-Stroebele; Enrico Fedrigo; Miska Le Louarn; Norbert Hubin; Jérome Paufique; Julien Woillez

doi:10.1117/12.2055072

21 July 2014 A software based de-rotation algorithm concept for the new adaptive optics module (NAOMI) for the auxiliary telescopes of the VLTI

Emmanuel Aller-Carpentier, Enrico Marchetti, Reinhold Dorn, Françoise Delplancke-Stroebele, Enrico Fedrigo, Miska Le Louarn, Norbert Hubin, Jérome Paufique, Julien Woillez

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 91484A (2014) https://doi.org/10.1117/12.2055072
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Emmanuel Aller-Carpentier, Enrico Marchetti, Reinhold Dorn, Françoise Delplancke-Stroebele, Enrico Fedrigo, Miska Le Louarn, Norbert Hubin, Jérome Paufique, and 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); https://doi.org/10.1117/12.2055072

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KEYWORDS

Calibration

Actuators

Adaptive optics

Telescopes

Monte Carlo methods

Zernike polynomials

Algorithm development

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