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针对积分球开口光谱辐射特性测量的复杂性及紫外波段标准光源不确定度大的缺点,构建了一种基于紫外标准探测器的高精度绝对辐亮度计。用所构建的绝对辐亮度计,以3个波长为例,标定积分球开口光谱辐亮度,修正了250~400 nm波段积分球开口光谱辐亮度曲线。同时,利用该绝对辐亮度计对积分球输出稳定性、积分球开口均匀性以及朗伯余弦特性进行了全面测试。积分球开口3个波长280,313和352 nm处光谱辐亮度定标合成标准不确定度分别为3.2%,3.0%和3.0%,积分球输出稳定性、开口均匀性以及朗伯余弦特性3个波长处合成标准不确定度分别为1.7%,1.6%和1.6%。不确定度分析表明用绝对辐亮度计研究积分球光谱辐射特性与传统的积分球光谱辐射特性研究相比方便可行且精度更高。
Aiming at the complexity of spectral radiation characteristics measurement of the opening of the integrating sphere and the uncertainty of the standard light source in the ultraviolet band, a high-precision absolute radiometer based on ultraviolet standard detector was constructed. Using the constructed absolute radiometer, taking the three wavelengths as an example, the spectral radiance of the opening of the integrating sphere was calibrated, and the spectral curve of the opening of the integrating sphere in the wavelength range of 250-400 nm was corrected. At the same time, the absolute radiometer was used to test the output stability of the integrating sphere, the uniformity of the integrating sphere and the Lambertian cosine. Integral sphere opening Spectral radiances at the three wavelengths 280, 313 and 352 nm Calibration standard synthetic uncertainty of 3.2%, 3.0% and 3.0% respectively Integral sphere output stability, opening uniformity and Lambertian cosine characteristics Three wavelengths The synthetic standard uncertainty is 1.7%, 1.6% and 1.6% respectively. Uncertainty analysis shows that it is more feasible and more accurate to study the characteristics of the integrating sphere spectral radiance with the absolute radiometer than the traditional research of the integrating sphere spectral radiance.