大视场红外搜索系统的光机结构设计

摘要

The infrared search system with characteristics of miniaturization, integration, large field of view and high resolution was designed. Firstly,working principle of the infrared search system was described,which used scan imag-ing method of stitching the nine gaze view pictures to obtain images with large field of view and high resolution. Opti-cal system construction consists of offsetfield prism, scanning mirror and imaging lens. The field range of each staring field is 6.87° × 5.50° , and then a wide field of 6.87° × 45.10° is acquired by the above scan imaging method. Analyzing and evaluating the imaging quality of the optical system explain that:optical system MTF is close to diffraction limit at 20lp/mm. The transmission of scanning mirror system and timing design of image acquisition were emphatically intro-duced in mechanical structure design. This system weights 52kg after manufacture and assemblage;moreover,the scan-ning system is able to realize smooth operation. Thus,all the results of the optic-mechanical design have met the de-sign requirement.%设计了具有小型化、集成化的兼具大视场和高分辨率的红外搜索系统。首先阐述了系统的工作原理：采用扫描成像方法将9个凝视视场的图像拼接获得大视场高分辨图像；光学系统结构由偏移视场棱镜组、扫描镜和成像镜头三部分组成，光学设计的单个凝视视场范围为6.87°×5.50°，通过上述扫描方式拼接后获得6.87°×45.10°的大视场，对系统的成像质量进行了分析与评价，在20lp/mm时系统MTF接近衍射极限；重点介绍了扫描镜机构中传动装置以及图像采集时序设计，完成加工装调后系统重量52kg，扫描装置运转平稳，光机设计结果均达到设计要求。