宽波段太阳辐照度仪光谱定标方法研究

宽波段太阳辐照度仪采用fèry棱镜分光，利用线阵CCD反馈控制光谱扫描，波长覆盖范围为400~2 500 nm.为实现该仪器的高准确度光谱定标，在实验室内利用单波长激光器和OPO激光器分别作为光源.通过光谱扫描，得出定标波长与CCD像元的对应关系.根据棱镜参量和光路设计参量推导出全波段内光谱定标方程，实现全波段光谱定标.通过与其他特征波长比较，分析得出光谱定标合成不确定度优于0.5 nm.用定标好的仪器进行室外测量，将测量结果与大气辐射传输软件modtran4模拟结果相比对，可得实际测量的大气吸收峰与模拟结果一致.将该方法在红外波长区域定标结果与传统的多项式拟合光谱定标方法对比，显示该定标结果优于传统多项式拟合方法.证明该定标方法的正确性和仪器设计的合理性.

Abstract

Wide band solar irradiance spectrometer that the wavelength coverage is from 400 nm to 2 500 nm uses fèry prism to disperse composite light, with linear array CCD controlling scan of spectrum. To achieve the high-precision spectral calibration of the instrument, asingle-wavelength laser and an OPO laser are used as light sources in the laboratory. Through thespectral scanning, the correspondence between the calibration wavelength and the CCD pixel is obtained.According to the prism and optical design parameters, the spectral calibration equations that achieve full-band spectral calibration are derived. It is verified that the spectral calibration uncertainty is better than 0.5 nm by comparing with other characteristic wavelengths. Comparing measured results with the simulation of atmospheric radiation transmission software that is named as modtran4, the measured atmospheric absorption peaks are in agreement with the simulation results. The results of calibration in the infrared wavelength region are compared with the traditional polynomial fitting method, which shows that the calibration results aresuperior to the traditional polynomial fitting method. It is proved that the calibration method is correct and the instrument design is rational.

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宽波段太阳辐照度仪光谱定标方法研究

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