Research on Absolute Calibration of Sun Channel of Sun Photometer Using Laser Raster Scanning Method
XU Wen-bin, LI Jian-jun, ZHENG Xiao-bing
Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
Abstract：In the present paper, a new calibration method of absolute spectral irradiance responsivity of sun channel of sun photometer was developed. A tunable laser was used as source and a standard tranfer detector, calibrated against cryogenic absolute radiometer, was used to measure laser beam power. By raster scanning of a single collimated laser beam to generate the uniform irradiance field at the plane of effective aperture stop of sun photometer, the absolute irradiance responsivity of center wavelength of the 870 nm unpolarized sun channels of sun photometer was obtained accurately. The relative spectral irradiance responsivity of corresponding channel was obtained by using lamp-monochromator system and then used to acquire the absolute spectral irradiance responsivity in the laboratory. On the basis of the above results, the top-of-the-atmosphere responsive constant V0 was obtained by integration with extraterrestrial solar spectral irradiance data. Comparing the calibration result with that from GSFC, NASA in 2009, the difference is only 3.75%. In the last, the uncertainties of calibration were evaluated and reached to 2.06%. The principle feasibility of the new method was validated.
徐文斌，李健军，郑小兵 . 激光点阵扫描法绝对定标太阳辐射计直射通道研究 [J]. 光谱学与光谱分析, 2013, 33(01): 255-260.
XU Wen-bin, LI Jian-jun, ZHENG Xiao-bing . Research on Absolute Calibration of Sun Channel of Sun Photometer Using Laser Raster Scanning Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(01): 255-260.
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