Calculation on asphericity of off-axial partial annular mirror

Details Calculation on asphericity of off-axial partial annular mirror Calculation on asphericity of off-axial partial annular mirror

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pnaoc...1..289x&link_type=abstract

Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 1, No.

Computer Science

Graphics

Partial Annular Mirror, Off-Axis Aspherical Surface, Asphericity

Scientific paper

A 30m giant telescope project, Chinese Future Giant Telescope (CFGT), has been proposed by Chinese astronomers. It primary mirror consists of 1095 off-axis partial annular aspherical sub-mirrors including 17 different types. In this paper, the method on calculating related technical parameters is considered for these sub-mirrors figuring. Their asphericities under several different constraint conditions are compared. The optimal radius of curvature of the best fitting spheres and the maximum asphericity of each type of aspherical sub-mirror are obtained. And the removals on the sub-mirror surface are plotted in 3D graphics. These calculations will be the basics of grinding and polishing these sub-mirrors in the future.

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