光学学报, 2020, 40 (7): 0722002, 网络出版: 2020-04-15
面向小行星探测的可见-红外光谱成像光学系统 下载: 1425次
Visible-Infrared Imaging Spectrometer for the Exploration of Asteroids
摘要
设计了一种用于小行星探测的宽波段可见-红外Offner型光谱成像光学系统。该系统的工作波段覆盖0.4~2.7 μm,其可见-近红外(VNIR)通道( 0.4~1.0 μm )和短波红外(SWIR)通道(1.0~2.7 μm) 的F数分别为6和3。通过求解及优化初始结构,设计完成的光学系统点列图直径小于单个像元尺寸,且在Nyquist频率处的调制传递函数(MTF)值不小于0.51。为改善系统的光谱响应,满足宽波段成像的需求,系统中的凸面光栅被分成两个具有不同周期的区域,分别工作在VNIR通道和SWIR通道。根据光学设计结果,开展原理样机研制并进行性能测试。测试结果表明,研制得到的光学系统成像质量良好,满足设计指标要求。
Abstract
In this study, we design an optical system for a visible-infrared (VNIR-SWIR) Offner imaging spectrometer for the space exploration of asteroids. The operation waveband of the proposed system covers from 0.4 μm to 2.7 μm, and the F number is 6 and 3 for the visible/near-infrared (VNIR) band (0.4--1.0 μm) and the short wave infrared (SWIR) band (1.0--2.7 μm), respectively. Subsequent to the initial structure development and optimization, spot diameters in the spot diagrams of the proposed optical system are observed to be less than one pixel, and the minimum modulation transfer function (MTF) is 0.51 at the Nyquist frequency. To improve the spectral response to fulfill the broadband spectral imaging requirement, the convex grating is divided into two regions with different grating periods. The inner region works in the VNIR band, while the other works in the SWIR band. The prototype of the imaging spectrometer optical system is developed and its spectral performance is characterized. Results show that the performance of the proposed prototype is satisfactory and can meet the requirements.
杨福臻, 陈新华, 赵知诚, 刘全, 沈为民. 面向小行星探测的可见-红外光谱成像光学系统[J]. 光学学报, 2020, 40(7): 0722002. Fuzhen Yang, Xinhua Chen, Zhicheng Zhao, Quan Liu, Weimin Shen. Visible-Infrared Imaging Spectrometer for the Exploration of Asteroids[J]. Acta Optica Sinica, 2020, 40(7): 0722002.