Simulation and validation of a prototype swing arm profilometer for measuring extremely large telescope mirror-segments.
The Extremely Large Telescope (ELT) projects presuppose segmented primary mirrors. The metrology of the off-axis aspherical segments is particularly challenging in terms of global form, mid spatial frequencies and matching of the base-radius and conic constant. We propose to use a swing arm profilometer (SAP) to provide verification independent of interferometry. In this paper we present results of a simulation of the swing arm profilometer as applied to mirror segments, and experimental verification of the simulation using a prototype instrument.
Jing
Hongwei
H
Institute of Optics and Electronics, Chinese Academy of Sciences, P.O .Box 350, Chengdu 610209, China. hwjing@ioe.ac.cn
King
Christopher
C
Walker
David
D