基于AOTF成像光谱仪主动变焦前置光学系统设计  

Optical Design of Active Zoom Front System for AOTF Imaging Spectrometer

作　　者：常凌颖 王馨幼 邱跃洪[2] 王冠儒 石浩楠 梁驰 陈奎 Chang Lingying;Wang Xinyou;Qiu Yuehong;Wang Guanru;Shi Haonan;Liang Chi;Chen Kui(College of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,Shaanxi,China;Xi'an Institute of Optics and Precision Mechanics of CAS,Xi'an 710119,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]中国科学院西安光学精密机械研究所,西安710119

出　　处：《光学学报》2023年第19期176-183,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61475190)。

摘　　要：声光可调协滤波器(AOTF)成像光谱仪可同时获取探测目标的空间图像和光谱信息,具有体积小、质量轻、中心波长挑选灵活等优势。提出一种基于AOTF成像光谱仪组合变焦光学系统设计方案并完成了主动变焦前置光学系统仿真设计。该方案由主反式变焦前置系统和具有任意放大倍数的投影系统组成,可实现大变焦范围主动变焦成像。前置光学系统的初始结构由主反式变焦系统设计理论确定,利用同轴系统的离轴解和参数优化完成离轴三反远心结构的设计和系统像差校正,构建逐步逼近优化法实现主动连续变焦。在Code V中的仿真结果表明:前置变焦系统工作波段为0.5~1.7μm,变焦范围为260~520 mm,短焦处调制传递函数大于0.68@34 lp/mm,长焦处大于0.45@34 lp/mm,全场的均方根半径小于0.345μm,成像质量良好。Objective The acousto-optic tunable filter(AOTF)spectrometer can simultaneously acquire the spatial image and spectral information of the detection target,featuring small size,light weight,and flexible selection of central wavelength.The optical system is an essential part of the information obtained by the AOTF imaging spectrometer,and its design scheme and imaging quality can affect the instrument's performance.The zoom system has continuously variable focal lengths.A suitable zoom system can effectively expand the imaging function of the AOTF spectrometer and realize continuous detection,tracking,recognition,and collimation of the target object.The zoom optics of current AOTF spectrometers is mostly mechanical zoom.The mechanical zoom system can modify the focal length only by changing the distance between the components.In contrast,the active zoom system without moving parts can adjust the focus by controlling the changes in curvature and refractive index of the active optical elements.In this study,we propose a design scheme of a combined zoom optical system of AOTF imaging spectrometer,which consists of an active zoom front optical system and a projection system with arbitrary magnification(N)to achieve a wide range of zoom,and the simulation design of active zoom front system is completed.Methods First,the structure and working principle of the AOTF imaging spectrometer are investigated to determine the optical system design scheme,and the design theory of the off-axis three-mirror active zoom optical system is studied in detail to determine the initial structure of the zoom front system.Then,the off-axis field of view(FOV),eccentricity,and tilt of the mirror are added to remove the central light obstruction,which provides more possibilities for the spatial layout of each component.It tends to be coaxial after optimization,and the mirror must be constrained in the tilt and processed by decentration by using the@JMRCC macro function.After that,a progressive approximation is used to implement the continuous

关 键 词：声光可调协滤波器成像光谱仪 光学设计 组合主动变焦 离轴三反 像方远心 

分 类 号：O439[机械工程—光学工程]