Scanning pentaprism measurements of off-axis aspherics II

Peng Su; James H. Burge; Brian Cuerden; Richard Allen; Hubert M. Martin

doi:10.1117/12.828497

21 August 2009 Scanning pentaprism measurements of off-axis aspherics II

Peng Su, James H. Burge, Brian Cuerden, Richard Allen, Hubert M. Martin

Proceedings Volume 7426, Optical Manufacturing and Testing VIII; 74260Y (2009) https://doi.org/10.1117/12.828497
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

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.

Citation Download Citation

Peng Su, James H. Burge, Brian Cuerden, Richard Allen, and Hubert M. Martin "Scanning pentaprism measurements of off-axis aspherics II", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260Y (21 August 2009); https://doi.org/10.1117/12.828497

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