Design of an E-ELT M1 segment measurement machine with nanometer accuracy

A. Bos, R. Henselmans, P.C.J.N. Rosielle, M. Steinbuch, M.J.A. te Voert

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

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.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 22 June 2014, Montreal, Quebec
Place of PublicationBellingham
PublisherSPIE
Pages1-12
ISBN (Print)9780819496195
DOIs
Publication statusPublished - 2014
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation - Montreal, Canada
Duration: 23 Jun 201427 Jun 2014

Publication series

NameProceedings of SPIE
Volume9151

Conference

ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Country/TerritoryCanada
CityMontreal
Period23/06/1427/06/14

Keywords

  • European Extremely Large Telescope (E-ELT)
  • Giant telescopes
  • Ground-based astronomy
  • Measurement machine
  • NANOMEFOS
  • Non-contact
  • Segment metrology

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