为了对目标的多波段辐射特性进行测量，设计了一套300～1 000 nm三波段光学成像系统.该系统共用同一入射窗口，采用两个直角棱镜进行分光，每个波段使用独立的光学成像镜头，能同时得到目标的紫外、可见光和近红外图像.利用LightTools软件对此系统的鬼像进行模拟分析，发现棱镜表面和窗口玻璃之间的光束多次反射之后，经过光学成像镜头聚焦到探测器靶面上，形成了目标的多重鬼像，大大降低了图像的对比度.实验结果表明：采用本文所述方案，三波段成像系统能达到较好的像质；将窗口玻璃和第一个棱镜的角度控制在7″之内可以消除鬼像，对使用棱镜作为分光元件的多波段光学成像系统的设计和研制具有一定的参考意义.

In order to measure multiband radiation characteristic of objects, a tripleband optical imaging system working in 300～1 000 nm range was designed, which shared the same optical window. In this system, two right-angle prisms were used to split light of different waves, and each band used independent optical lens. This system can obtain images at the same time in the wavebands of ultraviolet, visible and infrared. The ghost image of the system was simulated and analyzed with the help of Lighttools software. It is shown that there are multiple ghost images which reduce the contrast ratio of the images on the surface of detector, because of light multiple reflected between the surfaces of right-angle prism and window. Experimental results show that the tripleband optical imaging system can achieve good image quality, and the ghost images can be cleared away when the angle of the optical window and the first prism is controlled in seven seconds. The efforts of this paper are referable for research and design of multiband optical imaging system using prism to split light.