为实现目标光谱辐射亮度的高精度测量，研制了一种小视场近紫外到近红外光谱辐射计，光谱范围为300 nm～2 000 nm，光谱辐射亮度测量范围为50 μW/cm2·nm·sr～1 000 μW/cm2·nm·sr。阐述了近紫外到近红外光谱辐射计设计原理及关键部件，使用基于钨带灯的直接定标法实现了光谱辐射计光谱辐射亮度绝对定标，测量了标准积分球光源的光谱辐射亮度，测量值与积分球光源标准值偏差优于0.5%。

In order to realize high precision measurement of spectral radiance, a kind of small field near ultraviolet(UV) to near infrared(IR) spectroradiometer was developed with a wavelength range of 300 nm~ 2 000 nm and a spectral radiance measurement range of 50 μW/cm2·nm·sr~1 000 μW/cm2·nm·sr. First the design principle and critical components of the near-UV to near-IR spectroradiometer were described. Then the direct method based on tungsten strip lamp was used to realize the spectral radiance absolute calibration of this spectroradiometer. Finally, the spectral radiance of the standard integrated sphere source was measured. The results show that the deviation between measured and standard values is less than 0.5%.