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- W2041777008 abstract "Graphite fiber-reinforced glass matrix composites are being developed for a variety of structural applications requiring excellent thermomechanical stability. These materials are ideally suited for lightweight, high strength, thermally stable infrared mirrors because of their low density, low thermal expansion, high strength and stiffness, and their ability to be machined, replicated and figured using standard polishing techniques. These properties are particularly promising for applications such as a 3-meter balloon-borne far-infrared and submillimeter telescope mirror which must be both very lightweight and able to retain its figure accuracy when cycled between room temperature and its operating temperature of -50 C. This paper presents the results of a set of low temperature optical tests conducted to determine the figure stability of a 30-cm diameter, frit-bonded graphite/glass mirror in the +20 to -60 C temperature range using a 10.6 micron laser interferometer. The results indicate that the residual change in figure was less than 0.3 microns, rms." @default.
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- W2041777008 date "1986-02-21" @default.
- W2041777008 modified "2023-09-23" @default.
- W2041777008 title "Thermal Stability of Lightweight Graphite Glass Sandwich Reflectors for Far Infrared Astronomy" @default.
- W2041777008 doi "https://doi.org/10.1117/12.950415" @default.
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