A comparison of gravity sag measurement methods

Stephen Cheney

doi:10.1117/12.3028599

1 October 2024 A comparison of gravity sag measurement methods

Stephen Cheney

Proceedings Volume PC13134, Optical Manufacturing and Testing 2024; PC1313404 (2024) https://doi.org/10.1117/12.3028599
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Optics manufactured in a gravitational field are made with inherent internal stresses. When these optics are removed from the gravitational field (I.E., put into space) these stresses release. This is referred to as G-release. Theory offers methods of predicting the resulting 0-G shape of these optics. The intent of this paper is to compare results of real data measured on the same mirror from two separate methods; the ‘N-1 rotation test’ and the ‘face up/face down test’.

Conference Presentation

Citation Download Citation

Stephen Cheney "A comparison of gravity sag measurement methods", Proc. SPIE PC13134, Optical Manufacturing and Testing 2024, PC1313404 (1 October 2024); https://doi.org/10.1117/12.3028599

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