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Optical Engineering

Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments
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Paper Abstract

Rigid tools can confer advantages at certain stages of manufacturing off-axis mirror segments, but the misfit due to surface asphericity and asymmetry poses constraints on their application. Types of misfit are classified and, using least squares, the best-fit tool forms with different distances from the pole of the parent asphere are calculated. The outer mirror segment for the European extremely large telescope is taken as a case-study, assuming a rigid tool size of 150 mm. A simple independent approximation validates the calculation. A close parallel is wavefront misfit in subaperture interferometry, which is also considered.

Paper Details

Date Published: 1 July 2011
PDF: 7 pages
Opt. Eng. 50(7) 073401 doi: 10.1117/1.3597328
Published in: Optical Engineering Volume 50, Issue 7
Show Author Affiliations
Ci Song, National Univ. of Defense Technology (China)
David Walker, Univ. College London (United Kingdom)
Guoyu Yu, OpTIC (United Kingdom)

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