title: Simulation and validation of a prototype swing arm profilometer for measuring extremely large telescope mirror-segments.
abstract: 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.
authors.affiliation: Institute of Optics and Electronics, Chinese Academy of Sciences, P.O .Box 350, Chengdu 610209, China. hwjing@ioe.ac.cn
authors.forename: Hongwei
authors.initials: H
authors.lastname: Jing
authors.forename: Christopher
authors.initials: C
authors.lastname: King
authors.forename: David
authors.initials: D
authors.lastname: Walker