摘要
与连续变焦光学系统相比,两档变焦光学系统具有结构简单、装调容易、透射比高等优点。针对320×240非制冷焦平面阵列探测器,设计了一个长波红外两档变焦光学系统,系统采用切入式变焦方式,在短焦时切入两片透镜实现宽视场,宽视场时全视场角为31.4°,可用于跟踪和搜索目标;窄视场时全视场角为6.44°,可用于捕获和观察目标。通过引入二元面和非球面,大大提高了成像质量,在空间频率11 lp/mm处,宽视场和窄视场都具有较好的成像质量。
Compared with the continuous zoom optical system, infrared switch-zoom system had many advantages, such as simple structure, easy fixing, high transmission and so on. For 320 × 240 uncooled focal plane array, an infrared long wave switch-zoom system was presented. The manner of zoom was accomplished by inserting two lenses into the layout of narrow field of view. In the wide angle mode, the field of view was 31.4° which was used for searching and tracking targets. In the narrow angle mode, the field of view was 6.44°, the narrow field of view was used for capturing and observing targets. The binary surface and aspheric surface were used to improve the image quality. Both the wide-FOV and narrow-FOV had high image quality at spatial frequency of 11 lp/mm.
出处
《红外技术》
CSCD
北大核心
2008年第8期439-441,共3页
Infrared Technology
关键词
光学设计
红外光学系统
两档变焦
非球面
optical design
infrared optical system
switch-zoom
aspheric surface
