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Proceedings Paper

The optimization of the opto-mechanical performance of the mirror segments for the E-ELT
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Paper Abstract

ESO is preparing to build the E-ELT which will be the largest optical telescope in the world. Its primary mirror will be (see manuscript)39.3 m and will consist of nearly 1000 hexagonal segments of 1.2 meter width. Each segment is to be supported by the same structure although the segments vary in size and shape, hence this will cause variable surface deflection. Its support structure must guarantee a maximum surface form error of 30 nm rms independent of the segment orientation and environmental temperature. Measures, such as mass balancing and active surface form compensation are needed to compensate for these effects. To meet the main optical and mechanical performance requirements, numerous FEM analysis runs have been made. Dedicated software was used to calculate mirror deformations under mechanical loads and to express these in Zernike modes. Especially this tool proved to be very powerful in proving that the optical surface form requirements could be met for all different sized mirror segments.

Paper Details

Date Published: 10 November 2011
PDF: 10 pages
Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360H (10 November 2011); doi: 10.1117/12.916685
Show Author Affiliations
Jan Nijenhuis, TNO (Netherlands)
Roger Hamelinck, TNO (Netherlands)

Published in SPIE Proceedings Vol. 8336:
Integrated Modeling of Complex Optomechanical Systems
Torben Andersen; Anita Enmark, Editor(s)

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