13 September 2012 The opto-mechanical performance prediction of thin mirror segments for E-ELT
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Abstract
The mirror segments for the E-ELT and TLT are nearly equal in size and shape (hexagonal, 1.2 m over flat sides). They are very thin (about 50 mm) compared to their size. Supporting these mirrors and obtaining high optical performance is a challenge from design and manufacturing point of view. TNO has designed and build (together with VDL-ETG) three identical prototypes for supporting the mirror segments of the E-ELT. These mirror segments vary in size. Hence the gravity induced deformation of the mirror segments will vary from mirror to mirror segment when no measures are taken. The paper will concentrate on the design and analysis of the design features within the support structure to minimize the mirror deformation due to gravity. These features concern passive and active means to influence the mirror segment shape and to compensate for deformation differences.
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Jan Nijenhuis, Roger Hamelinck, Ben Braam, "The opto-mechanical performance prediction of thin mirror segments for E-ELT", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500A (13 September 2012); doi: 10.1117/12.926263; https://doi.org/10.1117/12.926263
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