Optical design for low-level-light color night vision systemand its image quality evaluation
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摘要: 为了充分利用可见光和长波红外所蕴含的不同信息进行数据融合、彩色显示，分析了3种不同类型双波段光学系统及其成像性能，设计了全折射光学系统、折反射光学系统和离轴三反射双谱光学系统。采用不同的分光形式，反射可见光波段，透射长波红外波段，使3种不同类型光学系统的全视场角和相对孔径分别为5和1∶1.7；光学系统在可见光波段成像质量对应的空间频率50lp/mm处的MTF=0.60，在长波红外波段成像质量对应的空间频率15lp/mm处的MTF=0.30。对不同结构类型的系统特点进行分析和讨论，给出了各种像差曲线和光学传递函数曲线,为多波段彩色夜视设计了不同类型的光学系统。Abstract: In order to use visible and long wave infrared information for image fusion and color display, three dual-band imaging optical systems and theirs imaging performance were analyzed. All-refractive optical system, catadioptric optical system and off-axis three-reflection dual spectrum optical system were designed. A beam splitter was adopted to reflect visible and transmit LW infrared. Its full field of view and relative aperture are up to 5 and F/1.7, and MTF is higher than 0.60 at 50lp/mm in the visible region, higher than 0.30 at 18lp/mm in the LWIR region. The construction features of the lens are discussed, the aberration curves and MTF curves of the system are presented.
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Keywords:
- night vision /
- optical system /
- low-level-light color /
- dual-band
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