大视场紫外告警相机光学系统研究与设计

Optical System Study and Design Used for the Ultraviolet Warning Camera with Ultra-wide Field

为了提高紫外探测器系统的信噪比,确保紫外告警相机的低虚警率,分析与研究了大视场紫外光学系统的结构型式,采用反远距、准像方远心光路,实现了大视场光学系统的像差校正,使系统具有优良的成像质量及均匀的像面照度.设计了波段范围为0.254~0.272μm、视场角为110°、相对孔径为1/3的光学系统.系统成像质量良好,畸变小,像面照度均匀.成像质量分析结果表明：全视场最大弥散斑半径小于53.7μm,轴上、轴外视场像面照度均匀性小于15%,0.85视场的相对畸变小于20%,满足紫外告警相机的使用要求.

In order to improve the signal to noise ratio of the system and reduce the false alarm rate, the structure type, correction of the image aberration and the image illumination uniformity were researched and analyzed. The telecentric and retrofocus structure was adopted. The system with the full field of view of 110°, the relative aperture of 1/3, and spectral range from 0. 254 μm to 0. 272 μm was designed. The analysis results demonstrate that the dispersion spot diameter is smaller than 53.7 μm, the relative distortion is smaller than 20% at 0.85 field of view, and the relative illumination uniformity is smaller than 15% . The structure is compact and feasible for ultraviolet warning camera.