推扫式红外光纤传像光学系统研究

针对推扫式红外遥感成像技术在高分辨对地观测领域的重要地位, 结合我国红外遥感技术发展现状和长线阵红外探测器技术水平, 研究了利用线面转换的异型红外光纤传像束线阵端实现推扫, 面阵端与成熟的小面阵红外探测器耦合以获得高分辨红外遥感图像的光纤传像系统.分析了该红外光纤传像系统前置物镜和耦接镜设计中的主要问题, 并针对一种入射端为4 000×6元线阵, 出射端为160×150元面阵的红外光纤传像束设计了前置物镜系统和后继耦接镜系统.引入平均传递函数的方法对整体光学系统的MTF进行了模拟评价, 模拟结果显示整体光学系统成像良好, 两系统的成像性能皆达到衍射极限, 满足光纤传像系统的特殊要求, 可为该类光纤传像系统的设计提供参考.

Abstract

The push-broom infrared remote sensing imaging technology plays an important role in the high-resolution earth observation, but the internal development of infrared imaging technology is baffled by the technical level of long-linear array infrared detector. To achieve high-resolution push-broom infrared imaging, a method by the use of line-plane-switching infrared fiber bundle was proposed. In this method, the linear array end of the imaging fiber bundle was used as a long-linear array infrared detector and the plane array end of the bundle was coupled by a mature small infrared focal plane array with the single fiber corresponding to the pixel of the focal plane. The main problem of the design of the objective lens and coupling lens in the infrared fiber image transmission system was analyzed. And a system with an objective lens and an coupling lens was designed for a kind of fiber bundle which has 4 000×6 pixels on its entrance end and has 160×150 pixels on its exit end. The imaging performance of the objective lens and coupling lens were close to the diffraction limits while meeting special requirements of infrared fiber image transmission system. The presented design is a better reference for this kind of fiber image transmission system. The mean transfer function was introduced for evaluating the MTF of the overall optical system, and the simulation results show a good image quality.

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赵意意, 杨建峰, 闫兴涛, 李福, 薛彬. 推扫式红外光纤传像光学系统研究[J]. 光子学报, 2014, 43(2): 0222002. ZHAO Yi-yi, YANG Jian-feng, YAN Xing-tao, LI Fu, XUE Bin. Study of Push-broom Infrared Fiber Image Transmission System[J]. ACTA PHOTONICA SINICA, 2014, 43(2): 0222002.

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