Evaluation Of Spectral Hemispherical Reflection Measurements In The Infrared And Their Application To Rough Surfaces

K Gindele; M Kohl; M Mast

doi:10.1117/12.938339

24 September 1986 Evaluation Of Spectral Hemispherical Reflection Measurements In The Infrared And Their Application To Rough Surfaces

K Gindele, M Kohl, M Mast

Author Affiliations +

Proceedings Volume 0653, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion V; (1986) https://doi.org/10.1117/12.938339
Event: 1986 International Symposium/Innsbruck, 1986, Innsbruck, Austria

Abstract

Measurements of the near-normal/hemispherical reflectance in the infrared spectral range can be taken by using integrating spheres as photometric integrators. In the infrared region, where the reflectance of the sphere coating significantly differs from one, the specular component of the reflected flux causes problems due to the different weighting of the specularly and diffusely reflected part by the sphere wall. An evaluation method for circumventing these difficulties is presented. It is shown that the influence of the sample indicatrix can be eliminated with a good accurracy if the specular reflectance factor is known. The considerations are based on investigations in the spectral range from 1 μm to 15 μm performed with a Fourierspectrometer and a gold coated integrating sphere. Examples demonstrate the application of this method for the investigation of samples whose specular reflectance factors change with wavelength. That especially occurs if the selective properties of solar absorber coatings is caused by surface roughness. The described method can be applied to estimate the surface roughness parameters and to characterize the optical properties of selective solar absorber layers.

Citation Download Citation

K Gindele, M Kohl, and M Mast "Evaluation Of Spectral Hemispherical Reflection Measurements In The Infrared And Their Application To Rough Surfaces", Proc. SPIE 0653, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion V, (24 September 1986); https://doi.org/10.1117/12.938339

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