可见-近红外波段太阳光谱辐照度仪的辐射定标方法研究

Calibration method of VNIR solar irradiance spectroradiometer

为了满足可见-近红外波段太阳光谱的高精度观测需求,对使用细分光谱技术进行太阳直射辐射观测的新型太阳光谱辐照度仪,开展了辐射定标方法的研究。使用光谱辐照度标准灯在400nm^1 050nm光谱范围内对仪器进行相对定标,对满足比尔-朗伯定理的波段采用Langley法进行绝对定标,在整个光谱范围内将辐射基准溯源到大气层顶的太阳光谱辐照度。在甘肃敦煌和安徽合肥两地进行了室外比对实验,仪器观测结果和MODTRAN4.0模型的理论模拟结果一致,和CE318的4个气溶胶观测通道的结果偏差在5%以内,验证了该定标方法的合理性。

To meet the requirements of visible-near infrared（VNIR） high-precision observation of solar spectrum, a calibration method for a novel solar irradiance spectroradiometer based on spectrally-resolving technology was developed. The relative calibration based on standard lamp was carried out in 400 nm -1 050 nm, and the Langley method was carried out in the band sat isfying Beer-Lambert theorem, where after the solar irradiance spectroradiometer was traced to the solar spectral irradiance on the top of atmosphere （TOA） in the whole bands. The experi ments carried out in Dunhuang and Hefei showed, the observation results were consistent with the MODTRAN4.0 theoretical model, and the deviations with CE318 were less than 5% in the four aerosol observation bands, which validated the rationality of the calibration method.