21 August 2009 Scanning pentaprism measurements of off-axis aspherics II
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The scanning pentaprism test has provided an important absolute test method for flat mirrors, parabolic mirrors and also collimation systems. We have developed a scanning pentaprism system to measure off-axis paraboloidal mirrors such as those for the Giant Magellan Telescope (GMT) primary mirror. Special characteristics of the pentaprism testing of an off-axis mirror are discussed in the paper. We provide performance results for the final measurement of a 1.7 m off-axis parabolic mirror and present a technique used to determine the radius of the parent, off-axis distance and the clocking of the mirror from the data from the scanning pentaprism system.
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Peng Su, Peng Su, James H. Burge, James H. Burge, Brian Cuerden, Brian Cuerden, Richard Allen, Richard Allen, Hubert M. Martin, Hubert M. Martin, } "Scanning pentaprism measurements of off-axis aspherics II", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260Y (21 August 2009); doi: 10.1117/12.828497; https://doi.org/10.1117/12.828497

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