一种共光路双波段红外光学系统设计

Design of a Common Optical Path Dual-band Infrared Optical System

为同时实现目标反射率、温度信息以及复杂背景辐射环境下目标信息的获取,设计了一种共光路双波段红外光学系统。该光学系统采用二次成像结构,选用锗、硒化锌和硫系玻璃结合无热化设计,引入非球面,矫正了光学系统测查与轴外像差,简化了系统结构。光学系统全长不超过145mm,工作波段为中波红外3.7~4.8μm、长波红外7.7~9.5μm,F数为2,视场不小于6°×7°,满足100%冷光阑效率。最终得到的光学系统成像质量优良:光学系统在-40~60℃范围内成像质量良好,中波边缘视场MTF大于0.5,长波边缘视场MTF大于0.25。

A common optical path dual-band infrared optical system is designed to meet the target reflectivity,temperature information and target information in complex radiation environment acquisition at the same time.The optical system adopts a secondary imaging structure,and uses germanium,zinc selenide and chalcogenide glass combined with athermalization,then introduces aspheric surface,and corrects the chromatic aberration and off-axis aberration of the optical system and simplifies the system structure.The optical system does not exceed 145 mm,and the working band is medium-wave infrared:3.7~4.8μm,long-wave infrared:7.7~9.5μm,F-number is 2,the field of view is not less than 6°×7°.It meets 100%cold aperture efficiency.The imaging quality of the final optical system is excellent:the imaging quality of the optical system is good in the range of-40~60℃,the MTF of the medium-wave edge field of view is greater than 0.5,and the MTF of the long-wave edge field of view is greater than 0.25.