6 March 1989 Methods For The Comparison Of Accelerated And Natural Ageing Tests
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Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989); doi: 10.1117/12.949941
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
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.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Kohl, Ulrich Frei, Karlhanns Gindele, "Methods For The Comparison Of Accelerated And Natural Ageing Tests", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); doi: 10.1117/12.949941; https://doi.org/10.1117/12.949941
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KEYWORDS
Reflectivity

Optical coatings

Humidity

Solar energy

Nickel

Energy efficiency

Absorption

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