A METHOD FOR SPECTRAL-ANALYSIS OF CONCENTRATED SOLAR-RADIATION

In the year 1994 the DLR in Cologne inaugurated a 20 kW solar furnace for technological and scientific experiments. One of the main applicat ions of the solar furnace is the research on photochemical reactions u sing concentrated sunlight. For this purpose exact knowledge of the sp ectral composition and its local distribution is essential. The evalua tion of experiments and the validation of computer codes rely on these informations. The solar radiation that is concentrated to high flux d ensities (up to 4 MW/m(2)) shows short-time fluctuations and therefore a special measurement technique is required. It is shown how to use t he imaging properties of a Czerney-Turner monochromator in combination with video camera detection to achieve a fast spectral analysis. This measurement is actually done along an intersection line through the f ocus. Moreover the calibration is described and first test pictures ar e analysed. Copyright (C) 1996 Published by Elsevier Science Ltd.