一种红外探测器冷屏设计方法  

A Design Method of Cold Shield for Infrared Detectors

作　　者：田亚 付志凯 王冠[1] TIAN Ya;FU Zhi-kai;WANG Guan(North China Research Institute of Electro-Optics, Beijing 100015, China)

机构地区：[1]华北光电技术研究所,北京100015

出　　处：《红外》2022年第2期28-33,共6页Infrared

摘　　要：针对目前红外探测器冷屏的传统设计方案中隔板数量多、装配工艺难度大等问题,提出了一种简化的红外探测器冷屏设计方法。该方法减少了冷屏隔板数量,降低了冷头热质量,减少了空间对冷屏设计的限制。由于该方法忽略了窗座的热辐射,为了验证其可行性,分别采用传统方案和简化方案设计了某中波红外探测器的两种冷屏结构,并利用LightTools软件仿真了这两种结构中窗座热辐射对红外探测器的影响以及冷屏对视场外光线的抑制效率。仿真结果表明,当探测器工作的环境温度为344 K时,窗座热辐射在红外探测器上引起的噪声差异不超过0.3 mV。此差异相较于信号强度可以忽略不计,且两种冷屏对视场外光线的抑制效率仅相差0.2%,验证了本文设计方法的可行性。Aiming at the problems of large number of clapboards and difficult assembly process in the traditional design scheme of infrared detector cold shield,a simplified design method of infrared detector cold shield is proposed in this paper.This method reduces the number of cold shield partitions,the thermal mass of cold head and the limitation of space on cold shield design.Because this method ignores the window seat of thermal radiation,two kinds of cold shield structures of a mid-wave infrared detector are designed by using the traditional scheme and the simplified scheme respectively,and the LightTools software is used to simulate the influence of window seat thermal radiation on infrared detector and the suppression efficiency of cold shield to field light in order to validate its feasibility.The simulation results show that when the ambient temperature of the detector is 344 K,the noise difference caused by the thermal radiation of the window seat on the infrared detector is not more than 0.3 mV.The difference is negligible compared with the signal intensity,and the suppression efficiency of the two cold shields is only 0.2%different,which verifies the feasibility of the design method.

关 键 词：冷屏 窗座热辐射 中波红外探测器 

分 类 号：O435[机械工程—光学工程]