基于球面反射温阑的红外探测器变f数设计

发布时间：2018-05-27 20:01

本文选题：制冷型红外探测器 + f数　；参考：《物理学报》2017年15期

【摘要】：制冷型红外探测器f数由冷阑尺寸和位置决定,在冷阑附近加温阑可以改变探测器f数,但是会引入大量杂散辐射.为解决这一问题,提出一种基于球面反射温阑的红外探测器变f数设计方法.建立了温阑红外辐射模型,分析普通平面温阑引入的杂散辐射及其对探测器性能的影响.在此基础上提出球面反射温阑的设计方法,通过改变表面形状和发射特性,降低温阑引入的杂散辐射,以保证探测器变f数后的性能.为验证本文方法,设计球面反射温阑和普通平面温阑改变某制冷型探测器f数,在高低温试验箱内进行辐射定标实验测量两种温阑引入的杂散辐射,比较二者对探测器的影响.分析和实验结果表明,球面反射温阑引入的杂散辐射远小于普通平面温阑,引入的噪声等效温差也较小,能够更好地保证红外系统的成像性能.
[Abstract]:The number of cooled infrared detectors is determined by the size and position of the cold apertures. The detector f number can be changed by heating the apertures near the cold apertures, but a large amount of stray radiation will be introduced. In order to solve this problem, a design method of variable f number of infrared detector based on spherical reflection temperature aperture is proposed. The infrared radiation model of the thermal aperture is established to analyze the stray radiation induced by the ordinary plane diaphragm and its influence on the detector performance. On the basis of this, a design method of spherical reflecting temperature diaphragm is proposed. By changing the surface shape and emission characteristics, the stray radiation induced by the diaphragm is reduced, so as to ensure the performance of the detector after changing the f number. In order to verify the method in this paper, the spherical reflection aperture and the ordinary plane aperture are designed to change the f number of a refrigerated detector. The radiation calibration experiments are carried out in the high and low temperature test box to measure the stray radiation induced by the two apertures, and the effects of the two on the detector are compared. The analysis and experimental results show that the stray radiation induced by the spherical reflection temperature aperture is much smaller than that of the ordinary plane aperture, and the noise equivalent temperature difference is smaller, which can better guarantee the imaging performance of the infrared system.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【分类号】：TN215

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