基于波前编码的制冷型红外光学系统焦深拓展研究  

Extended Depth-of-Focus of Cooled Infrared Optical Systems using Wavefront Coding

作　　者：王馨竹 杨磊[1] 段文浩 杨童[1] 刘万成 谢洪波[1] WANG Xinzhu;YANG Lei;DUAN Wenhao;YANG Tong;LIU Wancheng;XIE Hongbo(Key Laboratory of Optoelectronics Information Technology(Ministry of Education),School of Precision Instruments and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;National Key Laboratory of Electromagnetic Space Security,Tianjin 300308,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术教育部重点实验室,天津300072 [2]电磁空间安全全国重点实验室,天津300308

出　　处：《光子学报》2025年第1期124-135,共12页Acta Photonica Sinica

基　　金：电磁空间安全全国重点实验室基金。

摘　　要：设计二次成像方式,解决了相位板放置位置和探测器冷阑结构之间的位置冲突,完成了制冷型红外光学系统的结构设计。引入波前编码技术,结合截止频率处调制传递函数的变化趋势和对调制传递函数曲线一致性的客观评价,分析相位板参数取值对系统的不同影响,直接得到合适的相位板参数。利用光学软件对波前编码系统进行仿真,并采用Lucy-Richardson迭代算法恢复编码模糊图像。基于像素及人眼视觉感受对复原图像进行综合评价,证明波前编码技术有效拓展了普通红外光学系统的焦深,可拓展至原焦深范围的20倍。The depth-of-focus of traditional infrared optical system always has the limited value.Installation errors and environmental temperature changes can cause defocus,degrading the image quality of infrared optical system.Therefore,infrared system imaging with extending depth-of-focus has been a popular research area in optical design.Currently,the depth-of focus expansion methods that researchers usually use have certain drawbacks.As wavefront coding technology gradually rises,it provides a new way to effectively expand the depth-of-focus of infrared optical system.Common infrared detectors are mainly divided into two types uncooled and cooled models.Compared to them,cooled infrared detectors can effectively eliminate the influence of stray light and thermal noise,and have many advantages in applications.Cooled infrared optical system refers to an optical system that matches a cooled infrared detector.The characteristic is that the cold stop of the detector is required as the aperture stop of the infrared optical system.Due to the fact that the phase mask in wavefront coding system needs to be placed at the position of the aperture stop,in order to avoid structure contradiction and reduce design complexity,infrared optical system based on wavefront coding generally matches an uncooled detector,and hardly matches a cooled detector.Therefore,this paper proposes an optical system that matches with a cooled infrared detector.The system uses a secondary imaging structure.It uses the cold stop of the detector as the aperture stop,and makes the cold stop efficiency achieve 100%.At the same time,the parallel plate is also similar to the effect of an aperture stop by controlling the direction of the light.This structure solves the structure conflict between the required position of the phase mask and the position of the cold stop.Finally,the parallel plate is changed to the extended polynomial surface type.And the phase mask surface is determined by modifying the polynomial coefficients,successfully introducing the wavefront

关 键 词：光学设计 红外光学系统 波前编码 焦深拓展 相位板 

分 类 号：O439[机械工程—光学工程]