Ultroviolet (UV)- and thermal-stability of absorbing coatings for space instrumentation

Peter Weissbrodt; L. Raupach; Erich J. Hacker; Sigrid Wagner; Heiner Kappel

doi:10.1117/12.188129

30 September 1994 Ultroviolet (UV)- and thermal-stability of absorbing coatings for space instrumentation

Peter Weissbrodt, L. Raupach, Erich J. Hacker, Sigrid Wagner, Heiner Kappel

Proceedings Volume 2210, Space Optics 1994: Space Instrumentation and Spacecraft Optics; (1994) https://doi.org/10.1117/12.188129
Event: Space Optics '94, 1994, Garmisch, Germany

Abstract

Absorbing coatings for space-borne optical instruments must accept - besides optical requirements - unusual challenges regarding their chemical stability and their emission of gaseous and condensable materials under space conditions. Consideration of mass balances according to ANSI/ASTM E 595 do not provide enough information for proper choice of the coatings in the vicinity of sensitive optical elements. By in-situ mass spectrometric and XPS measurements we have investigated chemical changes of different black paints and inorganic coatings, their outgassing and the contamination of the surfaces near the coatings. In general, organic black paints are threatened by UV- irradiation and by thermal loads. Changes of their chemical composition under energetic UV-irradiation and the intense emission of contaminating materials were proved. The inorganic coatings investigated do not change their chemical composition and cause only comparatively small contamination on surfaces in their vicinity. For reducing the problem of contamination in optical systems it is still necessary to make available appropriate inorganic coatings with improved absorbing characteristics. However, if lower absorption can be tolerated, the use of inorganic coatings in sensible optical equipment should be considered already now.

Citation Download Citation

Peter Weissbrodt, L. Raupach, Erich J. Hacker, Sigrid Wagner, and Heiner Kappel "Ultroviolet (UV)- and thermal-stability of absorbing coatings for space instrumentation", Proc. SPIE 2210, Space Optics 1994: Space Instrumentation and Spacecraft Optics, (30 September 1994); https://doi.org/10.1117/12.188129

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KEYWORDS

Contamination

Optical coatings

Silicon

Aerospace engineering

Natural surfaces

Optical components

Carbon

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