@inproceedings{15c2e7a30df742188668871b0acea42b,
title = "Scanning pentaprism measurements of off-axis aspherics",
abstract = "The pentaprism test is based on the property of a paraboloidal surface where all rays parallel to the optical axis will go through its focal point. We have developed a scanning pentaprism system that exploits this geometry to measure off-axis paraboloidal mirrors such as those for the Giant Magellan Telescope primary mirror. Extension of the pentaprism test to off-axis mirrors requires special attention to field effects that can be ignored in the measurement of an axisymmetric mirror. The test was demonstrated on a 1. -m diameter off-axis mirror and proved to have about 50nm rms surface accuracy. This paper gives detailed performance results for the measurement of the 1.7 m mirror, and designs and analysis for the test of the GMT segments.",
keywords = "Aspherics, Optical testing, Telescope",
author = "Peng Su and Burge, {James H.} and Brian Cuerden and Jose Sasian and Martin, {Hubert M.}",
year = "2008",
doi = "10.1117/12.789588",
language = "English (US)",
isbn = "9780819472281",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation",
note = "Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation ; Conference date: 23-06-2008 Through 28-06-2008",
}