近红外-短波红外岩心光谱成像及矿物识别  

NIR-SWIR Spectral Imaging for Core and Mineral Dentification

作　　者：谭宏婕 刘洪成[1] 叶发旺[1] 鲁纳川 张川[1] TAN Hongjie;LIU Hongcheng;YE Fawang;LU Nachuan;ZHANG Chuan(National Key Laboratory of Remote Sensing Information and Image Analysis Technology Beijing Research Institute of Uranium Geology,Beijing 100029,China;China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029 [2]中国地质大学(北京),北京100083

出　　处：《世界核地质科学》2023年第2期405-415,共11页World Nuclear Geoscience

基　　金：中核集团集中研发项目“第四代铀矿勘查关键技术研究与示范(第一阶段)”:“新型关键勘查技术装备研制”(编号:遥SD 03-03)资助。

摘　　要：高光谱成像仪将光谱成像技术与光谱分析技术融合在一起,在获得目标影像信息的同时获得相应的光谱信息。开展了近红外和短波红外成像光谱仪光学设计,采用凸面光栅进行分光,在此基础上研制了近红外和短波红外成像光谱仪。经过实验测试,全波段全视场弥散斑半径均方根均小于1/2像元,MTF值均大于0.85。通过FPGA(可编程阵列逻辑器件)实现了近红外和短波红外高光谱成像仪同步触发,再经过同视场装校和速高比调整获取了具有较高信噪比的近红外-短波红外波段一体化光谱曲线,近景成像获取了近红外-短波红外影像数据,光谱真实性验证表明:获取的光谱曲线与ASD实测同像元光谱曲线相关性可达98%以上,典型矿物特征吸收峰位置偏差均在1个像元以内。最后利用近红外-短波红外高光谱影像进行矿物信息识别,取得了良好的应用效果。The hyperspectral imager integrates spectral imaging technology with spectral analysis technology,obtaining corresponding spectral information while obtaining target image information,the optical design with higher imaging quality in the near-infrared and short-wave infrared bands was carried out.On this basis,the push-broom near-infrared and short-wave infrared hyperspectral imager with higher spectral resolution was developed.After experimental testing,the root mean square radius of the diffuse spot in the full band and full field of view is less than 1/2 pixel,and the MTF value is greater than 0.85.The near-infrared and shortwave infrared hyperspectral imager is synchronously triggered by FPGA board.After accurate installation and calibration of the imaging spectrometer,the image matching of the same field of view and the velocity-height ratio by adjusting,and the integrated spectral curve of near-infrared and shortwave infrared band with a high signal-to-noise ratio was obtained.The system was applied to the core close-range hyperspectral imaging.After spectral authenticity verification,the correlation between the spectral curve obtained by the near-infrared and short-wave infrared hyperspectral spectrometer and the spectral curve measured by ASD reached more than 98%,and the position deviation of typical mineral characteristic absorption peak is within 1 pixel.The results show that the near-infrared and short-wave infrared hyperspectral spectrometer can identify the altered minerals by the reflectance curve of minerals.It has the advantages of compact structure,light miniaturization and strong portability.

关 键 词：高光谱成像仪 同步触发 同视场装校 速高比 光谱真实性 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] P619.14[自动化与计算机技术—控制科学与工程]