大气与环境光学学报, 2015, 10(4): 333, 网络出版: 2015-04-01

太阳辐射计实验室定标方法

Laboratory Calibration Method of Sunphotometer
作者单位

1中国科学院安徽光学精密机械研究所 中国科学院通用光学定标与表征技术重点实验室, 安徽 合肥 230031

2中国科学院遥感与数字地球研究所, 北京 100101

摘要
太阳辐射计是全球AERONET站点最重要的观测设备,为获取全球气溶胶时空分布提供了大量的观测数据。研究一种直接溯源于低温绝对辐射计的 高精度定标方法,可以在实验室环境条件下获得太阳辐射计的直射通道和天空漫射通道的定标系数,详细介绍了太阳辐射计实验室定标原理、实验装置, 在太阳辐射计的主要工作波段扫描获得绝对光谱响应度定标曲线,并对测量结果进行了不确定度分析。结果表明,天空漫射通道的定标不确定度低于0.8%, 太阳直射通道的定标不确定度低于2.06%。
Abstract
Sunphotometer is the most important observation instrument in global AERONET site, which supply a lot of observation data for obtaining time and space distributions of global aerosol. A kind of high accuracy calibration method against cryogenic radiometer is developed in laboratory, calibration coefficient of sun channel and sky diffuser channel can be obtained in the ambient condition of laboratory. The calibration principle and installation are introduced in detail, calibration curve of absolute spectral responsivity are obtained in major spectral channel, and measurement uncertainty is analysed. The result indicated that the uncertainty of calibration coefficient of sky diffuser channel is less than 0.8% and sun channel is less than 2.06%.
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