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Proceedings Paper

A stitching method to test the segments of a large primary
Author(s): Enoch Gutierrez-Herrera; Marija Strojnik; Gonzalo Paez; Paul Shore; Paul Morantz
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Paper Abstract

The European Extremely Large Telescope will be a large optical/infrared telescope with a segmented primary mirror of 42-m diameter, and 84-m radius of curvature. Each segment, about 1.2-meters across, implies great manufacturing and measuring challenges. To determine the most adequate metrology technique for testing these segments, we report a brief comparative analysis of the four most important testing techniques used for large surfaces. The study shows that the stitching method is the most appropriate technique. We implement a proof of concept to demonstrate the viability of this technique for studying surfaces with a small curvature and estimate the challenges to overcome. The analysis confirms that the success of the stitching technique, in curved elements, ensues because the roughness does not contribute significantly to the surface tendency. Therefore, we propose the use of tendency information to solve Procrustes' problem and to improve the resultant shape of the unified map for surfaces with small curvature, as in the case of the segments of a large primary mirror.

Paper Details

Date Published: 1 September 2009
PDF: 10 pages
Proc. SPIE 7453, Infrared Spaceborne Remote Sensing and Instrumentation XVII, 74530U (1 September 2009); doi: 10.1117/12.826765
Show Author Affiliations
Enoch Gutierrez-Herrera, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Marija Strojnik, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Gonzalo Paez, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Paul Shore, Cranfield Univ. (United Kingdom)
Paul Morantz, Cranfield Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 7453:
Infrared Spaceborne Remote Sensing and Instrumentation XVII
Marija Strojnik, Editor(s)

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