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A broadband spherical prism imaging spectrometer based on a single integrated module
Optical and Quantum Electronics ( IF 3.3 ) Pub Date : 2021-05-06 , DOI: 10.1007/s11082-021-02930-y
Shi-yao Zhou , Yue-ming Wang

The application range of hyperspectral imaging is subject to the operational system platform especially relies on the core imaging spectrometer. With a rising practical requirement of extensive remote sensing recently, the traditional method of two or multiple separate imaging submodules combined has obviously brought inevitable shortages in certain cases such as mineral detection or environmental monitoring, etc. Not only is the whole imaging system somewhat so large in physical size and so high in weight that it has an objective influence on convenience as well as flexibility in actual operation, but also each independent instrument has unique optical parameters and assembling matrices after fabrication and alignment which is against the image consistency. Instead of common image correction and data processing, the essential solution is to set up a broadband integrative system platform. This paper introduces a new prototype of imaging spectrometer in the visible and near-infrared (VNIR) to short-wave infrared (SWIR) region. Different from most existing research-based and commercial VNIR to SWIR imaging spectrometers, it is designed as broadband integration of a single core module. The main optical system consists of a collimating mirror, a central dispersive spherical prism, a converging mirror and two plane mirrors on the sides, which is similar to the normal convex grating spectrometer of three-concentric-mirror (Offner) configuration. The imaging spectrometer has relatively high imaging quality and satisfactory instantaneous field of view (IFOV) with a fairly compact internal structure benefiting from the integrated design and conscientious fabrication. The approach not only avoids extra expense and alignment complexities of multiple spectrometers but also enhances radiometric stability and reduces stray light and polarization effects. Relative performance tests are performed in various specific environment and validating imaging experiments are represented on schedule to demonstrate the expectant effectiveness of the whole system.



中文翻译:

基于单个集成模块的宽带球面棱镜成像光谱仪

高光谱成像的应用范围取决于操作系统平台,特别是依赖于核心成像光谱仪。随着近来广泛遥感的实际需求的增长,在某些情况下,例如矿物探测或环境监测等,传统的将两个或多个单独的成像子模块组合在一起的方法显然带来了不可避免的短缺。整个成像系统不仅如此之大物理尺寸和重量如此之高,以至于客观地影响便利性和实际操作的灵活性,而且每台独立的仪器在制造和对准后都有独特的光学参数和组装矩阵,这不利于图像的一致性。代替常见的图像校正和数据处理,根本的解决方案是建立宽带集成系统平台。本文介绍了一种在可见光和近红外(VNIR)到短波红外(SWIR)区域中成像光谱仪的新原型。与大多数现有的基于研究的商用VNIR到SWIR成像光谱仪不同,它被设计为单个核心模块的宽带集成。主光学系统由一个准直镜,一个中心色散球面棱镜,一个会聚镜和侧面的两个平面镜组成,类似于三同轴镜(Offner)配置的普通凸面光栅光谱仪。成像光谱仪具有较高的成像质量和令人满意的瞬时视场(IFOV),其内部结构相当紧凑,这得益于集成设计和认真制造。该方法不仅避免了额外的费用和多个光谱仪的对准复杂性,而且还增强了辐射稳定性,并减少了杂散光和偏振效应。在各种特定环境中进行了相对性能测试,并按计划进行了验证成像实验,以证明整个系统的预期效果。

更新日期:2021-05-06
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