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1 July 2011 Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments
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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.
©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)
Ci Song, David Walker, and Guoyu Yu "Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments," Optical Engineering 50(7), 073401 (1 July 2011). https://doi.org/10.1117/1.3597328
Published: 1 July 2011
JOURNAL ARTICLE
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