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.
Atomic, Molecular and Optical Physics | Engineering | Manufacturing | Other Engineering Science and Materials
Song, C., Walker, D. and Yu, G. (2011) "Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments", Optical Engineer Issue 50, 073401
Digital Commons Citation
Song, Ci; Walker, David; and Yu, Guoyu, "Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments" (2011). Holography, Optics and Photonics. Paper 3.