Automatic element and mineral detection in thin sections using hyperspectral transmittance imaging microscopy (HyperTIM)

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2022-05-10 DOI:10.5194/ejm-34-275-2022

Helge L. C. Daempfling, Christian Mielke, N. Koellner, M. Lorenz, C. Rogass, U. Altenberger, D. Harlov, M. Knoper

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引用次数: 1

Abstract

Abstract. In this study we present a novel method for the automatic detection of minerals and elements using hyperspectral transmittance imaging microscopy measurements of complete thin sections (HyperTIM). This is accomplished by using a hyperspectral camera system that operates in the visible and near-infrared (VNIR) range with a specifically designed sample holder, scanning setup, and a microscope lens. We utilize this method on a monazite ore thin section from Steenkampskraal (South Africa), which we analyzed for the rare earth element (REE)-bearing mineral monazite ((Ce,Nd,La)PO4), with high concentrations of Nd. The transmittance analyses with the hyperspectral VNIR camera can be used to identify REE minerals and Nd in thin sections. We propose a three-point band depth index, the Nd feature depth index (NdFD), and its related product the Nd band depth index (NdBDI), which enables automatic mineral detection and classification for the Nd-bearing monazites in thin sections. In combination with the average concentration of the relative Nd content, it permits a destruction-free, total concentration calculation for Nd across the entire thin section.

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使用高光谱透射成像显微镜（HyperTIM）自动检测薄片中的元素和矿物

摘要在这项研究中，我们提出了一种新的方法来自动检测矿物和元素使用高光谱透射成像显微镜测量完整的薄片(HyperTIM)。这是通过使用高光谱相机系统来完成的，该系统在可见光和近红外(VNIR)范围内工作，带有专门设计的样品支架，扫描装置和显微镜镜头。本文利用该方法对南非Steenkampskraal的单氮石矿石薄片进行了分析，得到了含稀土元素(REE)的矿物单氮石((Ce,Nd,La)PO4)，其中Nd含量较高。利用高光谱vnir相机进行透光率分析，可以识别薄片中的稀土矿物和钕。提出了三点带深度指数Nd特征深度指数(NdFD)及其相关产品Nd带深度指数(NdBDI)，实现了含Nd单脱石薄片矿物的自动探测和分类。结合相对Nd含量的平均浓度，它允许在整个薄截面上进行无破坏的Nd总浓度计算。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.