昼光和夜天空光的测量方法

Study on the Measurement Method of the Light of Day and Night

探讨了天空光度与色度测量方法与测量仪器的选用,提出了根据晨昏蒙影确定天空光测量时间基点的方法。用符合CIE1931xy的标准色源对一种彩色亮度计进行校准后,证明由于白昼和夜晚天空光色度不同,用一种标准光源对彩色亮度计进行校准,不能完全适用和伸延到各个色域。依照国际标准,使用与不同色域对应的标准光源和标准色源对彩色亮度计进行校准,使彩色亮度计的测量误差减到了最小限度。应用经过校准的彩色亮度计,实测了特定地区的24 h白昼和夜晚天空光的亮度与色度。通过数据分析,研究了天空光随时间的变化规律和测量夜天空光的改进方法。

The paper discusses the method and the selection of the measurement and the instrument of the sky luminosity and chroma. Based on twilight time, a method is presented to determine the starting and ending time of the sky light measurement. A color luminance meter has been calibrated based on CIE1931xy standard color source. It cannot be fully applicable and extended to each color gamut, when a color brightness is calibrated by using only a standard light source, because daylight and night sky light color is different. According to the international standard, the standard source and color source for different color gamuts are calibrated, and the measurement error of the color luminance meter is reduced to a minimum. The brightness and color of the sky light in 24 hours of day and night in a given area are measured. The changes of the sky light and the methods of measuring the night sky light are studied.