轻小型短波红外高光谱成像仪精细化矿物识别

The refined mineral identification based on compact shortwave infrared hyperspectral imager

高光谱成像仪具有“图谱合一”的特点,可以同时获取目标物的空间信息与光谱信息,在地质勘查中发挥有比较大的作用。为实现对不同岩石矿物的精细化识别,自主研制了具有结构紧凑、体积小、便携性强、分辨率高等优点的轻小型短波红外高光谱成像仪。仪器光学性能评价结果表明光谱仪实际光谱分辨率优于8 nm,符合设计和应用的要求。利用本仪器对岩石不同矿物组成成分的识别实验测试,获取了不同岩石的近景高光谱成像数据。经过数据处理和矿物提取分析研究,发现岩石光谱谱形特征与标准光谱库中特征吻合度很高,表明研制的高光谱成像仪能够对岩石样品进行矿物信息精细化识别,适用于无人机载成像,在铀矿地质勘查领域有广阔的应用前景。

With the integration characteristic of image and spectrum,hyperspectral imager can obtain the spatial and spectrum information of the object at the same time,which has great application in geological prospecting.In order to realize the fine identification of the ore,a compact shortwave infrared(SWIR)hyperspectral imager with the characteristic of compact structure,small volume,easy to carry and high resolution were developed.The optical of SWIR imaging spectrometer has been evaluated and showed that the actual spectral resolution is better than 8 nm,which meets the design and application requirements.Based on the SWIR hyperspectral imager,the close range hyperspectral imaging data and hyperspectral information of the various minerals were obtained.By means of processing and analyzing hyperspectral data,the distribution characteristics and regularities of altered mineral were analyzed.The results of spectral morphology and characteristic of different ore agreed well with standard spectrum library.It showed that the designed hyperspectral imager which is facilitate the application in unmanned aerial vehicle(UAV)imaging can identify different components of alteration minerals with refined mineral identification,and can be widely used in geological exploration.