Simulation and validation of a prototype swing arm profilometer for measuring extremely large telescope mirror-segments

Hongwei Jing, Christopher King, David Walker

Research output: Contribution to journalArticle

28 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2036-2048
Number of pages13
JournalOptics Express
Issue number3
Publication statusPublished - 1 Feb 2010
Externally publishedYes


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