中波红外成像系统冷反射抑制  

Narcissus suppression of medium-wave infrared imaging system

作　　者：卜和阳[1] 虞林瑶[1] 田浩南[1] 王健[1] BU He-yang;YU Lin-yao;TIAN Hao-nan;WANG Jian(Aeronautical Imaging and Measurement Technology Research Department,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所航空成像与测量技术研究一部,吉林长春130033

出　　处：《中国光学（中英文）》2023年第6期1414-1423,共10页Chinese Optics

基　　金：吉林省科技发展计划资助项目(No.20200403057SF)。

摘　　要：冷反射现象是指在红外热成像系统中制冷探测器通过前面光学表面的反射而探测到的自身的像,冷反射的控制是红外成像系统的重要任务。本文设计了一款采用Cassegrain(卡塞格林)反射结构的制冷型中波红外成像系统,分析了该系统的冷反射现象,得到了冷反射现象严重的表面。接着,通过Zemax软件降低这些严重面的冷发射,在控制冷反射的同时兼顾系统传递函数MTF的优化。通过NARCISSUS宏命令(冷反射分析宏命令)、Tracepro建模软件和实际成像图将优化后的中波红外成像系统与冷反射抑制前的系统进行比对。结果显示:探测器像面冷反射引入的等效温差(NITD)由1.0484 K下降到了0.1576 K,同时系统在调焦过程中冷反射斑的能量和尺寸无明显变化,优化后的光学结构有效地控制了系统的冷反射。Narcissus refers to the phenomenon in an infrared system where a cooled imaging sensor can“see”its own reflected image by the reflection of the frontal optical surfaces.Control of narcissus is one of the important requirements in the design of the infrared imaging system.A cooled medium-wave infrared imaging system with Cassegrain reflection structure is designed and analyzed to obtain the optical surfaces with serious narcissus.In addition,the narcissus is reduced by Zemax,and the optimization of the system transfer function MTF is taken into account while the narcissus is controlled.The optimized medium-wave infrared imaging system is compared with the imaging system without narcissus suppression through NARCISSUS macro(narcissus analysis macro),Tracepro modeling software and actual imaging,and it was found that the narcissus induced equivalent temperature difference(NITD)of the detector image surface decrease from 1.0484 K to 0.1576 K.The energy and size of the narcissus spot did not show marked change during the focusing of the system.The optimized optical structure can effectively control the narcissus of the system.

关 键 词：冷反射 制冷型中波红外成像系统 冷反射引入等效温差 

分 类 号：O432[机械工程—光学工程] O432[理学—光学]