Modeling of a large deformable mirror for future E-ELT

Details Modeling of a large deformable mirror for future E-ELT Modeling of a large deformable mirror for future E-ELT

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7017e..59g&link_type=abstract

Modeling, Systems Engineering, and Project Management for Astronomy III. Edited by Angeli, George Z.; Cullum, Martin J. Proc

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Increasing dimensions of ground based telescopes while implementing Adaptive Optics systems to cancel both structural deformations and atmospheric effects require very large diameters deformable mirrors (DM) and a high number of actuators with large strokes. This has led for the future E-ELT to a 2.5 m diameter DM getting about 8000 actuators. This paper presents a local and a global model of the DM in order to both study its influence function and its dynamical behavior. In the first part, influence function of the mirror is calculated. Results obtained by an analytical way are compared to those obtained numerically. In the second part, modal analysis of the mirror is presented. Results are limited to the first modes. Modal analysis is also only made for the base plate to derive the specific influence of DM's components on the global dynamic behavior. In the last part, optimization methods are used to help designing a 1 m prototype of the DM.

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