A series of experiments have been conducted to document the effect of atomic oxygen impingement in low earth orbit(LEO) on potential solar dynamic concentrator materials. Designs currently under consideration involve both reflective and refractive concepts. Reflective surfaces must maintain high specular reflectivity over the wavelength range 200-2500 nanometers during the ten year mission lifetime in LEO: refractive lens materials on the other hand, must maintain high specular transmittance. To protect surfaces from the negative effects of atomic oxygen, micrometeoroid impacts, and condensible contaminants from the orbiter and space station, LEO durable will be required. Reflective surfaces investigated include silver, aluminum, copper, gold, platinum, and rhodium. The best results in terms of integrated solar specular reflectance were achieved with aluminum and silver. Several protective coatings were evaluated for atomic oxygen stability, including magnesium fluoride, silicon dioxide, aluminum oxide, indium tin oxide, RTV silicones teflon, and silicon dioxide co-deposited with a fluoro-polymer. Materials evaluated for Fresnel refractive lens applications were space qualified silicones, polycarbonate, acrylic and different fluoropolymers. Samples were exposed to atomic oxygen fluxes generated by RF dissociation of molecular oxygen at both NASA Lewis Research Center and the University of Toronto. Changes in sample mass, surface morphology, and optical properties due to atomic oxygen impingement were recorded. Experimental data indicate that dielectric materials provide excellent protection against atomic oxygen degradation.


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    Titel :

    Solar concentrator materials development


    Weitere Titelangaben:

    Entwicklung von Werkstoffen fuer Sonnenlichtkonzentratoren


    Beteiligte:
    Morel, D.E. (Autor:in) / Ayers, S.R. (Autor:in) / Bulino, D.A. (Autor:in) / Tennyson, R.C. (Autor:in) / Egger, R.A. (Autor:in)


    Erscheinungsdatum :

    1986


    Format / Umfang :

    7 Seiten, 19 Bilder, 4 Tabellen, 10 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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