Abstract
This paper reviews the current techniques for carrying out spectral measurements of sun and sky radiation by means of colored glass filters. The results are discussed of an original investigation into the occurrence of what are believed to be systematic errors in enclosed hemispherical-filter thermopile systems, employed in pyranometer design. As a result of an analysis of a large mass of solar spectral measurement material, attention was first directed to an apparent change in instrument sensitivity, when operating conditions are continuous over long periods.
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More From: Archiv für Meteorologie, Geophysik und Bioklimatologie Serie B
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