紧凑中波/可见摆扫成像装置光学设计与分析

为了在空间限制严格的条件下，实现远距离、双波段、摆扫成像要求，采用双波段折反缩束镜、双快反镜及紧凑的单波段透镜后组，并通过优化设计，建立了一种紧凑型双波段摆扫成像光学系统。其中，双波段折反缩束镜由RC系统、CAF₂分色棱镜、及单波段透镜组组成，分别在0.6~0.9 μm及3.6~4.9 μm波段取得接近衍射极限的像质，且摆扫成像像移均控制在半个像元以内。该双波段系统中，主次镜间无透镜，可见光系统焦距为1752 mm，光学系统三维尺寸为380 mm (轴向)×Φ360，远摄比达到0.22，线遮拦比为0.34。在无遮光罩的前提下，仿真分析表明，入射角大于30°时，红外PST均小于1×10?4。且该系统加工及装调工艺成熟可控，成本较低。

Optical design and analysis of compact visible and medium-wave infrared whisking broom imaging system

To accomplish long-range visible and medium-wave infrared whisking broom imaging detection under strict space limitation, dual-band catadioptric shrink-beam system, double fast steering mirrors, and subsequet compact single-wave lenses was used to build a compact dual-band whisking broom imaging system through lens system design optimization. Among them, dual-band catadioptric shrink-beam system was composed of two-mirror Ritchey Chretien system, CaF₂ dichroic prism and subsequet single-wave lenses. The image quality of the shrink-beam system was closed to diffraction limit in the 0.6-0.9 μm and 3.6-4.9 μm wave bands. Image motion of the dual-band shrink-beam system were controlled within halves of the respective pixels during broom imaging process. The effective focal length of the dual-band catadioptric system in the visible band was 1752 mm, there was no lens in between the RC, the three dimensional size of the optical system was 380 mm (axial)×Φ360, the telephoto ratio was 0.22, the line obscuration ratio was 0.34. Based on simulation and analysis, when the incident angles were larger than 30°, the point source transmittance (PST) of the dual-band system was less than 1×10?4 without additional front baffles. And this system was designed with mature optical cold working, installation and adjustment process and low cost.