Dimensional metrology of mirror segments for extremely large telescopes

Graham N. Peggs; Richard May-Miller; David D. Walker; Eli Atad-Ettedgui; Paul R. Shore; David J. Smith

doi:10.1117/12.566231

7 July 2004 Dimensional metrology of mirror segments for extremely large telescopes

Graham N. Peggs, Richard May-Miller, David D. Walker, Eli Atad-Ettedgui, Paul R. Shore, David J. Smith

Proceedings Volume 5382, Second Backaskog Workshop on Extremely Large Telescopes; (2004) https://doi.org/10.1117/12.566231
Event: Second Backaskog Workshop on Extremely Large Telescopes, 2003, Backaskog, Sweden

Abstract

Metrology is critical amongst the challenges associated with the production of mirror segments on the scale required by proposed extremely-large telescopes. To achieve the optical specification in a reasonable time requires measurements with an unprecedented combination of accuracy, stability and speed. This study suggests combining several promising methods for use at different stages of production. Pallet mounting is proposed to permit the segments to be handled without significant distortion and to provide fiducials for precise location of the segment. Final qualification of a segment would include comparison with a master reference that had been certified by consensus among a number of independent experts.

Citation Download Citation

Graham N. Peggs, Richard May-Miller, David D. Walker, Eli Atad-Ettedgui, Paul R. Shore, and David J. Smith "Dimensional metrology of mirror segments for extremely large telescopes", Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); https://doi.org/10.1117/12.566231

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