PR-362-027 - 2012 AISTech Conference Proceedings

Bi-Reflectance Mapping and Automated Petrographic Analysis of Metallurgical Coke

David E. Pearson, Richard A. Pearson

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Crelling et al. (2005), described a method of acquiring calibrated images of carbon materials, in which a polarizer in the incident light path was advance 18 degrees between the capture of ten sequential images. From these images, the maximum and minimum reflectance values can be established for each pixel in an image, and by difference, the bireflectance (Rmax - Rmin), calculated. Reflectance maps showing the maximum reflectance value, the minimum reflectance value, and the bireflectance of all pixels in a field of view can be constructed (Figure 1). Although these maps superficially resemble photomicrographs, they are not real images; they are computer-generated maps, and do not represent scenes that can be seen conventionally, with a microscope.

Keywords: Coke, Petrography, Carbon-types, CSR, coke quality, Fingerprints