空间遥感光谱辐射计紫外／真空紫外光谱辐照度定标技术

Spectral Irradiance Calibration of Space Remote Sensing Spectral Radiometer in Range of UV and VUV

实验证明了发散光照明模式和平行光照明模式标定的光谱辐照度响应度在定标误差范围内一致.在此基础上构建了由150 W大功率氘灯、500 W氙灯和球面反射镜组成的平行光光谱辐照度定标单元,该单元解决了大多数光谱辐射计由于在紫外波段响应度低、信噪比小导致的定标困难,而且其输出光谱辐照度在一定距离范围内变化很小从而减小了装调误差,提高了定标准确度.分两个波段标定了一台紫外光谱辐射计160 nm～400 nm波段光谱辐照度响应度,其中160 nm～250 nm定标误差4.6%,250 nm～400 nm定标误差2.4%.

Experiments show that the influence of illuminated modes on spectral irradiance response calibration was little. Based on the conclusion,a spectral irradiance calibration unit using parallel light was established,it was composed of a 150W deuterium lamp,a 500 W xenon lamp and a spherical mirror. This method of irradiance calibration overcame the troubles caused by the weak response of most spectral radiometer in ultraviolet band and poor ratio of signal to noise ,and the output spectral irradiance of the unite had little change within some distance,thus the assembly error was reduced and irradiance calibration accuracy was improved. The unite calibrated a ultraviolet spectral radiometer in range from 160 nm to 400 nm. The error of spectral irradiance calibration is 4.6% from 160nm to 250nm,and 2.4% from 250 nm～ 400 nm.