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- W2045986777 abstract "Interferometric texts were performed on a 1.8-m ULE lightweight mirror at different uniform temperature conditions to determine figure changes due to expansion coefficient inhomogeneity. The conclusions of the experiment were: (1) The rms value of surface figure changes due to material inhomogeneities were found to be 0.036λ over a 42°C soak range at 6328 Å. (2) Time variations of surface figure change were found to be insignificant over periods of up to 6 days. (3) No hysteresis remained after returning to figuring temperature (the measurement uncertainty was less than 0.023λ rms at λ = 6328 Å). (4) Analytical predictions of surface figure change based on α inhomogeneity data were in close agreement with measurements." @default.
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- W2045986777 date "1972-12-01" @default.
- W2045986777 modified "2023-09-23" @default.
- W2045986777 title "Test Results on Homogeneity of Expansion for a 18-m ULE Lightweight Mirror" @default.
- W2045986777 doi "https://doi.org/10.1364/ao.11.002768" @default.
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