Absolute characterization of gravity sag

H. Philip Stahl

doi:10.1117/12.2568795

20 August 2020 Absolute characterization of gravity sag

H. Philip Stahl

Proceedings Volume 11487, Optical Manufacturing and Testing XIII; 114871F (2020) https://doi.org/10.1117/12.2568795
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

G-release – defined as the knowledge uncertainty of a mirror’s gravity-sag or the residual error between the mirror’s predicted and actual on-orbit shape – is a critical error budget element for space telescopes. For a UV/Optical telescope, G-release needs to be less than 4 nm rms. Absolute metrology techniques developed for high-accuracy optical surface testing can be used for characterizing gravity-sag of space optics. This paper presents the importance of gravity sag for space optics and reviews methods for its compensation, characterization or correction.

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Citation Download Citation

H. Philip Stahl "Absolute characterization of gravity sag", Proc. SPIE 11487, Optical Manufacturing and Testing XIII, 114871F (20 August 2020); https://doi.org/10.1117/12.2568795

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