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

Song, Ci, Walker, David and Yu, Guoyu (2011) Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments.


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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.

Item Type: Article
Additional Information: Copyright © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. The published version is also available online at the SPIE website via the DOI at http://dx.doi.org/10.1117/1.3597328
Keywords: misfit, rigid tools, aspheric segment
Divisions: ?? GlyndwrUniversity ??
Depositing User: ULCC Admin
Date Deposited: 04 Aug 2012 00:12
Last Modified: 11 Dec 2017 20:07
URI: https://glyndwr.repository.guildhe.ac.uk/id/eprint/4003

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