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Proceedings Paper

Methods For The Comparison Of Accelerated And Natural Ageing Tests
Author(s): Michael Kohl; Ulrich Frei; Karlhanns Gindele
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Paper Abstract

The performance ofmaterials used for solar energy conversion should be maintained for some decades of years. During the development of new products their durability must be investigated in short-term tests, in which the applied loads should be as similar as possible to the natural stresses under working conditions, but the tests should accelerate the degradation considerably. For these purposes the validation of accelerated indoor tests by a comparison with the results of natural ageing is essential. The naturally aged selective solar absorber coatings were only exposed to a part of the required lifetime. Therefore the observed degradations often are very small and a reliable comparison with the degradation achieved in accelerated temperature and moisture tests demands very sensitive analytical methods. Optical spectroscopy (0,3 - 15 μm) has also been used for the investigation of specific absorption bands as well as for the evaluation of differential spectra. Depending on the sample type, the analysis of the spectra has yielded optical thicknesses and refractive indices, or surface roughness parameters. The methods used for lifetime estimation can also be helpful for the comparison of the degradation of indoor and outdoor ageing.

Paper Details

Date Published: 6 March 1989
PDF: 11 pages
Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); doi: 10.1117/12.949941
Show Author Affiliations
Michael Kohl, University of Stuttoart (Switzerland)
Ulrich Frei, University of Stuttoart (Switzerland)
Karlhanns Gindele, University of Stuttoart (Switzerland)

Published in SPIE Proceedings Vol. 1016:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII
Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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