基于微场镜阵列的红外光场中继成像系统  

Infrared light field relay imaging system based on micro field lens array

作　　者：王腾飞[1] 陈永和[2] 傅雨田 Wang Tengfei;Chen Yonghe;Fu Yutian(Key Laboratory of Infrared System Detection and Imaging Technology,Chinese Academy of Sciences,Shanghai 200083,China;Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院红外探测与成像技术重点实验室,上海200083 [2]中国科学院上海技术物理研究所,上海200083 [3]中国科学院大学,北京100049

出　　处：《红外与激光工程》2020年第7期83-88,共6页Infrared and Laser Engineering

基　　金：国家重点研发计划(2016YFC1400901)。

摘　　要：光场成像是一种通过采集光场信息和重聚焦计算而成像的方法。由于微透镜型光场相机的结构限制,为实现光学系统与探测器的耦合,一般采用改造探测器的方法,但不适用于红外光场相机。为此,提出了微场镜阵列结合中继透镜的新型结构。这种新型结构通过中继透镜对中间像面1:1成像,通过微场镜阵列改善中继透镜产生的渐晕。采用倾斜刃边法计算系统的调制传递函数曲线,对比直接耦合、中继透镜耦合以及新型结构耦合三种结构的像质。根据不同的重聚焦面,新型耦合结构在奈奎斯特频率下的曲线值相比于中继透镜耦合结构提升5%~240%,接近直接耦合结构。新型结构可在实现耦合的同时,避免系统像质的大幅度下降,可在红外光场相机中起到重要作用。Light field imaging is a method of imaging by acquiring light field information and refocusing on a specific plane.With the limitation of the light field camera structure,the detector is generally modified to achieve coupling of the microlens array and the detector.It is not applicable to infrared light field cameras.To this end,a novel structure of a micro field lens array combined with a relay lens was proposed.This new structure utilized a relay lens to image the intermediate image plane at a 1:1 ratio and eliminated the vignetting of the relay lens through the micro field lens array.The modulation transfer function curve of the system was calculated by the slanted edge method.The image quality of direct coupling,relay lens coupling and new structure coupling were compared.According to different refocus planes,the curve value of the new coupling structure at Nyquist frequency was increased by 5%-240%compared with that of the relay lens coupling structure.It was close to the curve value of the direct coupling structure.The new structure can realize coupling and avoid the sharp decrease of system image quality.It plays an important role in the infrared field camera.

关 键 词：红外光场成像 中继透镜 渐晕 场镜 微透镜阵列 

分 类 号：O434.3[机械工程—光学工程]