可见/红外双色共孔径光学系统设计及实现

Design and Realization of Visible/LWIR Dual-color Common Aperture Optical System

为解决现有的共孔径双波段相机成像质量差、结构复杂、体积庞大的问题,提出了一种可见/长波红外双色光学系统设计。在两个波段共用前端反射结构、主镜背部加分色镜,实现了可见光与长波红外同时成像,保证了系统结构的紧凑性。分析了分色镜对红外波段成像的影响,以及分色镜偏离竖直方向不同角度的影响。对红外波段的校正系统及像面进行了-2.39 mm的偏心处理,使红外波段像质得到了极大提高,并通过外场试验成像验证了分析结果的正确性。该系统具有较强的容差特性,结构简单、光学元件少,具备易加工、装调的优点,工程可实现性强,能够有效提升相机的目标探测与识别能力。

In order to solve the problems of poor imaging quality,complex structure and large volume of existing dual-band common aperture cameras,a visible/long-wave infrared dual-color optical system was proposed.Simultaneous imaging is achieved by sharing the front-end reflection structure in the two bands and adding a dichroic beam splitter on the back of the main mirror,thereby ensuring the compactness of the system structure.The influence of the dichroic beam splitter on the infrared band imaging was analyzed in detail,as well as the influence of different angles of the dichroic beam splitter from vertical direction.The correct system of long wave infrared band and the image plane were eccentrically processed by-2.39 mm,so the image quality of the infrared band was greatly improved.The validity of the analysis conclusion was verified by the field test imaging.The results show that the system has loose tolerances,simple structure,and a few optical components.This system has the advantages of easy processing,installation,and strong engineering feasibility,which can effectively improve the target detection and recognition capabilities of the camera.