18 July 2014 Design of an E-ELT M1 segment measurement machine with nanometer accuracy
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The baseline design of the European Extremely Large Telescope features a telescope with a 39-meter-class primary mirror (M1), consisting of 798 hexagonal segments. A measurement machine design is presented based on a non-contact single-point scanning technique, capable of measuring the form error of each segment with nanometer uncertainty, fast, and with low operational costs. The implementation of a tactile precision probe eliminates the need for the CMM in the earlier segment manufacturing process. Preliminary assessment show nanometer-level uncertainty after calibration.
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A. Bos, A. Bos, R. Henselmans, R. Henselmans, P. C. J. N. Rosielle, P. C. J. N. Rosielle, M. Steinbuch, M. Steinbuch, M. J. A. te Voert, M. J. A. te Voert, "Design of an E-ELT M1 segment measurement machine with nanometer accuracy", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510X (18 July 2014); doi: 10.1117/12.2055143; https://doi.org/10.1117/12.2055143

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