机载大视场高光谱成像系统设计

Optical Design of Airborne Hyperspectral Imaging System with Wide Field of View

为适应机载高光谱成像系统的发展需要,设计了一种机载大视场高光谱成像系统。前置望远系统为大视场宽谱段透射式系统,高光谱成像仪为基于Offner次镜的改正型Féry棱镜中继系统。系统设计过程中两次使用Zemax多重组态设计;尝试将Offner次镜的改正型Féry棱镜设计为高光谱成像仪;将Féry棱镜高光谱成像仪集成为高光谱成像系统进行一体化系统分析。该设计在结构和设计方法上均有改进。设计的大视场可见近红外高光谱成像系统视场可达28°,机载载荷高度为5km时,全系统的刈幅宽度为2.493km,地面分辨率可达0.6m。左半视场和右半视场全谱段调制传递函数均大于0.6,最大谱线弯曲和谱带弯曲不到0.2pixel,成像质量接近衍射极限。

In order to meet the development needs hyperspectral imaging system with wide field of view is transmission system with wide field and wide-spectrum, of airborne hyperspectral imaging system, an airborne presented. In the system, the pre-telescope system is a and the hyperspectral imager is an improved Fery-prism relay system based on Offner secondary. Zemax multi-configuration is used twice in the system design process, and we attempt to design the improved Fery-prism of Offner secondary as a hyperspectral imager for the first time. Besides, the Fery-prism hyperspectral imager is firstly integrated as hyperspectral imaging system for system analysis. The design is innovative both on the structure and methods. The design results show that the field of view of the system is 28°, when the height of the airborne payload is 5 km, Swath width with the total system is 2. 493 km, and the ground sampled distance is 0.6 m. The full spectral modulation transfer functions of field half right and field half left are greater than 0. 6. Keystones and smiles about maxium are close to 0.2 pixel, and the image quality closes to the diffraction limit.