天空光の色分布に関する研究

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For the source of daylighting, the light from sky has been mainly utilized. Concerning the light from sky, its luminance distribution has been considerably investigated, but its colour has been scarcely discussed; however, the characteristics of spectral distribution of light from sky seems to be essential for visual environmental design. The colour of light from overcast skies varies with the altitude of sky elements, but its variation is estimated to be less than that of clear skies. On the contrary, the colour of clear sky light varies mainly depending on the following factors: altitude of sky element(h), angular distance from the sun(r), solar altitude (h_s), density of aerosol and quantity of water vapor in the atmosphere. The aim of this paper is to express the colour temperature distribution of the clear sky with three variables h, r, and h_s, under the condition when the aerosol is weak and the water vapor is little. Consequently,' the measurements were intended to be carried out in the clear day when the above conditions were satisfied. The measured points were simply arranged on each azimuth through the sun and zenith. The measured points were arranged at 2 degree intervals on the azimuth abovementioned. Colours of light from sky were measured in x-y chromaticity using colour luminance photometer, with aperture of 0.2 degree or 0.1 degree. It took over 10 minutes for each measurement. All the measured data were converted into correlated colour temperature in mired. Consequently, the colour temperature distribution on the azimuth could be estimated by three factors with considerabe accuracy, under the condition that the sky is very clear. It is very important to see if the above equation should be applicable for the whole sky. The regression equation has to be adjusted if necessary. The more accurate equation will be valuable data for advanced visual environment.
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天空光の色分布に関する研究

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