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紫外告警技术在军事应用中扮演着重要的角色。基于“日盲”紫外光学系统的最佳工作波段240~280 nm,设计了一款用于导弹逼近告警的光学系统。为提高系统接收的紫外辐射能、扩展系统探测范围以及简化系统结构,系统中采用了非球面和二元衍射光学元件。系统中含有5片透镜,其焦距为50 mm,视场角为43°。探测器采用ANDOR公司的iKon-L 936型CCD,其像元大小为13.5μm×13.5μm,有效成像面积为27.6 mm×27.6 mm。系统优化后,最大RMS半径仅为11μm左右,远小于像元尺寸。超过86%来自物方各视场的紫外辐射会聚在半径为6.75μm的圆内。像质表明,所设计的系统能够满足“日盲”紫外光学系统的工作条件。若减小焦距,则系统的视场角可进一步增大。
UV warning technology plays an important role in military applications. Based on the optimal working wavelength band of 240 ~ 280 nm for “Blind ” UV optical system, an optical system for missile approach warning was designed. To improve the system to receive ultraviolet radiation, expand the system to detect the scope and simplify the system structure, the system uses aspherical and binary diffraction optics. The system contains 5 lenses with a focal length of 50 mm and a field of view of 43 °. The detector uses ANDOR’s iKon-L 936 CCD with a pixel size of 13.5 μm × 13.5 μm and an effective imaging area of 27.6 mm × 27.6 mm. After system optimization, the maximum RMS radius is only about 11μm, much smaller than the pixel size. More than 86% of the UV radiation from the field of view of the object converged within a circle with a radius of 6.75 μm. Image quality shows that the system designed to meet “Blind ” UV optical system working conditions. If you reduce the focal length, the system’s viewing angle can be further increased.