设计了一个具有快焦比长焦距的日盲紫外光学系统。其F数为2.0,焦距为100 mm,总长与焦距之比为1.5。该系统由全球面透镜构成,未采用非球面或衍射光学元件,便于加工和检测。其中,正透镜采用氟化钙材料,负透镜采用熔石英材料,有效地校正了系统色差,最大垂轴色差不超过一个像素大小。设计结果表明,该系统成像性能优良、分辨率高,兼容了快焦比和长焦距的特点,满足设计要求,并且通过公差分析验证了该系统的工程可实现性。

In this study, a solar blind ultraviolet optical system with a fast focal ratio and long focal length is presented. Its F number is 2.0, and its focal length is 100 mm. The ratio of the total length to its focal length is approximately 1.5. The proposed system comprises all spherical lenses without using aspherical or diffractive optical elements, which is convenient for manufacturing and testing. The positive lenses are made of calcium fluoride, and the negative lenses are made of fused quartz, which are used to effectively correct the color aberration. The maximum lateral color aberration is less than one pixel in size. Design results show that the proposed system exhibits excellent imaging performance, high resolution, and is compatible with the characteristics of fast focal ratio and long focal length, which satisfies the design requirements. Furthermore, the tolerance analysis demonstrates that the proposed system can be realized in the practical engineering.