Title
The optimization of the opto-mechanical performance of the mirror segments for the E-ELT
Author
Nijenhuis, J.R.
Hamelinck, R.F.M.M.
Publication year
2011
Abstract
ESO is preparing to build the E-ELT which will be the largest optical telescope in the world. Its primary mirror will be Ø39.3 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. © 2011 SPIE.
Subject
Elt
M1 support structure
Opto-mechanics
Statically determined
Surface form deformations
Warping harness
Zernike
Built environment
Mechatronics, Mechanics & Materials
OM - Opto-Mechatronics
TS - Technical Sciences
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TNO identifier
445691
ISBN
9780819489937
ISSN
0277-786X
Source
Integrated Modeling of Complex Optomechanical Systems, 15 August 2011 through 17 August 2011, Kiruna, 8336 (8336)
Series
Proceedings of SPIE - The International Society for Optical Engineering
Document type
conference paper