宽波段、高分辨率折反式航摄物镜设计

Catadioptric photographic lens design for wide-band high-resolution aerial camera

为满足在10 000m左右高空摄影时地面分辨率达到0.2m的需要,采用长焦距和折反射式光路形式设计一种高分辨率CCD航摄物镜。使用普通玻璃校正由大口径和长焦距带来的二级光谱,且在单个像元尺寸为8μm的36mm×48mm大面阵、高分辨率CCD作为接收器的条件下,光学系统在60lp/mm处各视场的传递函数均接近衍射极限,满足成像质量要求,最终实现了在470nm～950nm宽波段工作范围内能够进行全天侯观察与测量。

To attaina ground resolution of 0.2 m when flying at an altitude of 10 000 m, we de- signed a high-resolution CCD aerial photography lens with long focal length and catadioptric optical path. In this design, we used ordinary glass to correct the secondary spectrum from large diameter and long focal length. In the condition of the large area array, high resolution CCD as the receiver with a single pixel size of 8 μm and an effective size of 36 mm×48 mm, the modulation transfer function of every FOV approached to the diffraction limit at 60 lp/mm, which met the image quality requirements. Finally, it achieved the all-time observation and measurement with wide band range of 470 nm-950 nm.