Process of maceral analysis of coal, with a view to determining its vitrinite content

摘要

Method for maceral analysis of coal on a sample consisting of ground coal coated in a resin, by exploring the surface of the sample using a microscope and by measuring the reflectance (reflective power) of vitrinite, characterised by the following steps: - for each field of the microscope, a digitised image with grey levels is produced; - the fields with high resin content are eliminated by thresholding; - for each field not eliminated: a) the grey level distributions and the gradients are determined; b) a binary image is produced by thresholding the grey gradients so as to determine the vitrinite zones; c) the distribution of the grey levels or densitometry of the vitrinite zones obtained is determined; and d) the reflectance of the vitrinite is calculated. IMAGE