Multispectral reflectance microscopy: Application to automated recognition of metallic ores
DOI:
https://doi.org/10.3989/revmetalm.107Keywords:
Geometallurgy, Image analysis, Metallic ores, Multispectral reflectance, Optical microscopyAbstract
The paper introduces the CAMEVA system, a multispectral reflectance microscopy system specially conceived to facilitate the identification and characterization of the mineral phases present in a polished block of metallic ores, as well as to automate the realization of different types of quantitative analyses on them. The CAMEVA system provides results similar to those of a SEM (scanning electron microscopy) system, surpassing some of its limitations, such as its rigid and costly infrastructure requirements and specialization or the difficulty of distinguishing polymorph species, but at a significantly lower cost. The tests carried out show that the system allows for automated and reliable identification of the ores of industrial interest from the multispectral information in the VNIR range (visible and near infrared, between 400 and 1000 nm) gathered in a specific database. This database, which includes 70 minerals of interest, is easily expandable.
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