长波双视场扫描型红外光学系统设计  

Design of dual-field scanning LWIR optical system

作　　者：赵新亮[1] 王海霞[2] 崔莉[1] 田海霞[1] 李同海[1] 吴海清[1] 

机构地区：[1]中国空空导弹研究院,河南洛阳471009 [2]洛阳师范学院物理与电子信息学院,河南洛阳471022

出　　处：《红外与激光工程》2011年第8期1517-1520,共4页Infrared and Laser Engineering

基　　金：航空科学基金(2010181004)

摘　　要：与中波红外成像系统相比,长波红外成像系统在地面目标探测上具有天然的优势。利用光学变焦原理,建立扫描型双视场光学系统的设计模型。基于制冷型288×4元焦平面HgCdTe探测器,设计了一套结构紧凑、变倍比为6倍的双视场机载前视红外光学系统,其工作波段为7.7～10.3μm,F数为1.67,长焦为154mm,短焦为25.45mm,扫描反射镜扫描角度为±9.22°。光学系统采用非球面技术,球差、像散、畸变等像差得到了很好的校正,成像质量接近衍射极限,全视场传递函数在特征频率20lp/mm处高于0.45。设计结果表明:该模型合理可行,可以为其他4N系列探测器类似扫描成像系统设计提供参考。Compared with medium-wave infrared imaging system, long-wave infrared imaging system processes natural advantage to detect the target on the ground. Using optical zoom theory, a dual-field scanning optical system model was established. Based on 288×4 cooled HgCdTe focal plane detector, a dual-field airborne FLIR optical system with compact structure and 6x zoom ratio was designed. Its operating band was 7.7-10.3 μm, F number was 1.67, focal lengths were 154 mm and 25.45 mm, and the scanning angle of the scanning mirror was ±9.22 °. Spherical aberration, astigmatism, distortion and other aberrations were well corrected by use of non-spherical technology. The imaging quality was close to the diffraction limit. The value of modulation transfer function is higher than 0.45 at the characteristic frequency of 20 lp/mm. Design results show that the model is reasonably practicable, and it provides reference for other similar scanning imaging system designs based on 4N series of detectors.

关 键 词：双视场 扫描成像系统 变倍比 

分 类 号：O43[机械工程—光学工程] TN21[理学—光学]