基于类Offner分光成像组件的水色成像光谱仪设计  

Optical Design of Ocean Color Imaging Spectrometer Based on Offner-Like Configuration Song

作　　者：宋玲玲 陈新华 潘俏[1,2,3] 沈为民 Lingling;Chen Xinhua;Pan Qiao;Shen Weimin(School of Optoelectronic Science and Engineering,Soochow University,Suzhou 215006,Jiangsu,China;Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province,Suzhou 215006,Jiangsu,China;Key Laboratory of Modern Optical Technologies of Education Ministry of China,Suzhou 215006,Jiangsu,China)

机构地区：[1]苏州大学光电科学与工程学院,江苏苏州215006 [2]江苏省先进光学制造技术重点实验室,江苏苏州215006 [3]教育部现代光学技术重点实验室,江苏苏州215006

出　　处：《光学学报》2024年第24期158-164,共7页Acta Optica Sinica

基　　金：江苏高校优势学科建设工程(PAPD);苏州市产业前瞻与关键核心技术项目(SYC2022142)。

摘　　要：为了观察海洋海岸带的环境变化,区分海洋中各种有机物和无机物,设计一款用于海洋水色探测的宽幅、高分辨率成像光谱仪光学系统。该成像光谱仪工作波段为0.4~0.9μm,由前置物镜和放大倍率为0.6的类Offner分光成像组件组成。首先分析水色成像光谱仪的指标要求,然后推导类Offner分光成像组件的初始结构参数,接着完成前置物镜和分光成像组件的设计。前置物镜采用离轴三反结构,F数为5,焦距为590.75 mm;分光成像组件像方F数为3,主镜和三镜采用Zernike自由曲面,光栅为凸球面光栅。由设计结果可知,各视场处的点列图均方根半径小于3.74μm,奈奎斯特频率处的调制传递函数大于0.8,成像质量好。该工作可为宽幅、高分辨率水色探测成像光谱仪的设计和研制提供技术基础。Objective The ocean,covering 71%of the Earth’s surface,serves as the cradle of life and a repository of resources.The development and utilization of ocean resources have significantly altered the ocean environment,which adversely affects the sustainable development.Ocean color,determined by the optical properties of the seawater and the suspended matter,reflects changes in seawater quality and the ocean environment.The imaging spectrometer,integrating optical imaging and spectroscopic technology,is a primary tool for ocean color monitoring.It can not only monitor the coastal environment and the distribution of the elements in the ocean but also can distinguish the composition effectively.With the increasing ocean color application and the urgent requirement of ocean studies,the imaging spectrometer optical system with wide swath and high resolution has important research significance and application value.Methods To address the ocean color monitoring requirements,we propose and design an optical system of an imaging spectrometer with a wide swath and high resolution.The system operates within a waveband of 0.4‒0.9μm and features a swath width of 140 km,a ground sampling distance of 20 m,and a spectral resolution of 5 nm.The imaging spectrometer is composed of the foreoptics and spectral imaging module.The foreoptics is an offaxis three mirror anastigmat(TMA)system.The spectral imaging module is designed with a unique Offnerlike configuration instead of the common Offner configuration.This configuration has similar optical components but with a nonunit magnification.The parameters requirement of the ocean color imaging spectrometer is analyzed and the optical specifications are given out first.Then,the initial structural parameters of the Offnerlike configuration calculation method are introduced.Using these calculated parameters,we design and evaluate the optical system for the foreoptics and spectral imaging module.Finally,we compare the optical design results using the conventional Offner configuration,det

关 键 词：光学设计 Offner分光成像组件 Zernike自由曲面 水色探测 

分 类 号：O439[机械工程—光学工程]