不同地域的阳光光谱分布特性

目的研究阳光的光谱能量分布特性。方法对高原、西北沙漠、热带海洋等3个地域200~800 nm波段的阳光进行光谱测量,分析不同地区、不同天气状况、不同扫描速度下的阳光光谱能量分布特性。结果高原地区阳光光谱中的紫外-可见波段的辐照强度明显比西北沙漠和热带海洋地区高,多云时200~800 nm波段的辐射总量与晴天相比降低1/4,200~400 nm的紫外波段的辐射总量仅为晴天时的54%。光谱测量仪的扫描速度对光谱测定结果基本无影响。结论研究获得的阳光紫外截止点、340 nm处的辐照强度、不同波段的辐照量,可为实验室光源暴露试验中的光源选择、光谱能量控制提供参考。

Characteristics of Sunlight Spectral Power Distribution in Three Different Areas

Objective To study the distribution characteristics of sunlight spectral power. Methods Sunlight spectral irradiation curves within the range of 200 nm-800 nm in the plateau, northwest desert and tropic areas were measured. The distribution characteristics of sunlight spectral power in different areas, weather conditions and scanning speeds were analyzed respectively. Results The irradiance strength within the UV and VIS wavelength coverage in the plateau area was higher than in the northwest desert and tropic areas. The total irradiance within the range of 200 nm-800 nm on cloudy days was 1/4 lower than that on sunny days, while the irradiance within the range of 200 nm-400 nm on cloudy days was only 54% of that on sunny days. The effect of the scanning speed of spectrometer on the determination results was neglectable. Conclusion The cut-off point of sunlight wavelength, the spectral irradiation at 340 nm wavelength and the irradiance within different wavelength coverages could be used as reference for light source selection and spectral power control in laboratory exposure tests.