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。

A high precision absolute radiance radiometer based on the ultroviolet (UV) standard detector is made up according to the complexity of the normal measurement of the spectral radiometric characteristics of the integrating sphere and the disadvantage of the huge uncertainty of the standard lamp in UV band. Calibration in three wavelengths is done so as to correct the curve of the aperture′s spectral radiance of the integrating sphere in 250~400 nm bands. Also the stability of the output, the uniformity of the aperture and the Lambert′s cosine characteristic of the integrating sphere are measured. The combined standard uncertainty in 280, 313 and 352 nm is 3.2%, 3.0% and 3.0% for the spectral radiance calibration and 1.7%, 1.6% and 1.6% for the stability of the output、the uniformity of the aperture and the Lambert′s cosine characteristic of the integrating sphere. Uncertainty analysis shows that research based on the absolute radiance radiometer is convenient, feasibility and has a higher precision in contrast to the traditional research of spectral radiance characteristics.