光谱学与光谱分析, 2014, 34 (8): 2293, 网络出版: 2014-08-18  

具有变视场性能的中红外光谱系统设计与研究

Design and Study of Middle Infrared Spectrum System with Variational Field of View
作者单位
1 中国科学院光电技术研究所, 四川 成都610209
2 电子科技大学光电信息学院, 四川 成都610054
3 中国科学院大学, 北京100049
4 中国南玻集团成都南玻玻璃有限公司,四川成都610200
摘要
为了用同一设备对目标在中红外光谱段同时实现跟踪和捕获, 针对像元尺寸为15 μm×15 μm的新型大面阵640×512红外探测器, 设计了一套大面阵中红外光谱变视场探测成像系统, 系统光谱范围为3.7~4.8 μm, F数为4.0, 窄视场为0.45°, 宽视场为0.90°, 通过利用机械机构在窄视场结构中切入两片透镜实现宽视场结构, 应用二次成像技术不仅有效减小了前固定组透镜口径, 而且实现了100%冷光阑匹配, 减小了进入红外探测器的杂光。该系统仅采用了锗和硅两种常用的红外材料, 为了有效校正系统的轴外像差和高级像差, 并保证变视场系统两种结构的齐焦性, 系统应用了非球面技术。设计结果表明, 奈奎斯特频率33 lp·mm-1处, 系统的窄视场和宽视场的传递函数值均优于0.2, 所有视场畸变均小于0.5%, 具有优良的成像性能。在极端温度-35~55 ℃范围时, 该大面阵中红外光谱变视场探测成像系统窄视场结构和宽视场结构的成像质量变化不大, 满足使用要求。
Abstract
In order to track and capture target at the same time with a set of equipment, a middle infrared spectrum variational field of view(fov) detection system with a large focal plane array was designed for a 640×512 novel large focal plane array infrared detector with the picture element size of 15 m×15 m. The spectrum range was 3.7~4.8 m, F number was 4.0, narrow FOV and wide FOV was 0.45 and 0.90 respectively. The manner of variational FOV was accomplished by pitching two lenses into the narrow FOV system layout with mechanism framework. Reimaging technology not only minished the diameter of front fixed group, but also met 100% cold shield efficiency to minish stray light into the infrared detector. Two common infrared materials Ge and Si were used in the variational FOV detection system. The aspheric technology was used in order to correct the off axis aberration and higher order aberration and assure the fixedness of image plane. At the spatial frequency 33 lp·mm-1, the modulation transfer function(MTF) was above 0.2 for both the narrow FOV and wide FOV. Moreover, the distortion is below 0.5%. The middle infrared spectrum variational FOV detection system has excellent image. The image quality of the middle infrared spectrum variational field of view detection system changed little in the working temperature range -35~55 ℃.

白瑜, 邢廷文, 蒋亚东, 冯成. 具有变视场性能的中红外光谱系统设计与研究[J]. 光谱学与光谱分析, 2014, 34(8): 2293. BAI Yu, XING Ting-wen, JIANG Ya-dong, FENG Cheng. Design and Study of Middle Infrared Spectrum System with Variational Field of View[J]. Spectroscopy and Spectral Analysis, 2014, 34(8): 2293.

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