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- W2003165748 abstract "High-performance space-based optical systems typically require structures that exhibit high levels of dimensionalstability over their lifetimes. To better understand the mechanisms for dimensional instability, a novel series of testswere carried out at Rutherford Appleton Laboratory on a breadboard high-stability optical bench structure. Goalsof the testing were to assess the relative stability of a pair of reference surfaces and to determine the contributions ofvarious structural elements and joints to dimensional instability. The breadboard was subject to an intensiveenvironmental test campaign that included thermal cycling under vacuum and random vibration testing. Metrologywas performed throughout the campaign to assess the dimensional stability response to the various environmentalloads. The metrology requirement was challenging, with measurements of micron-level displacement and arcsecond-level tilt over 1-meter distances being necessary in situ during environmental testing. This issue was resolvedusing a combination of techniques: a contacting coordinate measurement machine, laser interferometry, and opticalautocollimation. The greatest levels of instability were produced by random vibration testing, though evidence of abedding-in process implies that vibratory conditioning could be used to improve stability." @default.
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- W2003165748 date "2009-01-01" @default.
- W2003165748 modified "2023-09-26" @default.
- W2003165748 title "Dimensional Stability Testing on a Space Optical Bench Structure" @default.
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- W2003165748 doi "https://doi.org/10.2514/1.38228" @default.
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