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

Jan Nijenhuis; Roger Hamelinck

doi:10.1117/12.916685

10 November 2011 The optimization of the opto-mechanical performance of the mirror segments for the E-ELT

Jan Nijenhuis, Roger Hamelinck

Proceedings Volume 8336, Integrated Modeling of Complex Optomechanical Systems; 83360H (2011) https://doi.org/10.1117/12.916685
Event: Integrated Modeling of Complex Optomechanical Systems, 2011, Kiruna, Sweden

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.

Citation Download Citation

Jan Nijenhuis and Roger Hamelinck "The optimization of the opto-mechanical performance of the mirror segments for the E-ELT", Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360H (10 November 2011); https://doi.org/10.1117/12.916685

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