数字微镜器件(DMD)动态红外(IR)景象模拟技术具有大动态范围、高空间分辨率、高帧频、空间均匀性好、体积小等特点，能够在实验室内模拟红外景像，降低红外系统的研发成本，缩短研发周期。根据基于DMD的红外景象模拟系统的要求，分析了红外投影光学系统的特点，确定了其技术指标。从初始结构选取入手，利用像差平衡理论和非球面技术，针对DLP5500 DMD(1024 pixel×768 pixel)，设计出一种成像质量高、性价比高，工作在8～12 μm波段的红外投影光学系统。系统采用三片透射式结构，焦距为200 mm，相对孔径为13。应用Zemax光学设计软件进行像质评价，各视场调制传递函数(MTF)接近衍射极限，各视场的点列图均方根(RMS)半径远小于艾里斑的半径，满足设计要求。

The characteristics of the dynamic infrared (IR) scene simulation technology based on digital micro-mirror device (DMD) include large dynamic range, high spatial resolution, high frame rate, good uniformity, small volume and so on. It can simulate infrared scene in the laboratory, reduce the research cost of the infrared system and shorten the development cycle. According to the requirements of the infrared scene simulation system based on DMD, the characteristics of the infrared projection optical systems are analyzed, and the technical indices of the projection system are determined. The selection of initial structure is presented. The infrared projection system of high image quality and high performance-price ratio is designed for the wave band of 8~12 μm based on the aberration balance theory and aspherical technology. This system for DLP5500 DMD (1024 pixel×768 pixel) is composed of three refractive lenses. The focal length is 200 mm and the relative aperture is 13. The optical system image quality is evaluated with Zemax optical design software. The result shows that modulation transfer function (MTF) of the system is close to the diffraction limited curve. The spot diagram root mean square (RMS) value of each field of view is smaller than the radius of Airy disk. The system meets the requirements of technical specification.