Infrared spectroscopy is an effective tool for studying coals and determining quality parameters of interest to coal processors. Given a set of representative coals, spectral analysis using parameters based on a model of coal structure can yield consistent relations for predicting performance characteristics within the tolerances specified for traditional methods of analysis [1]. In infrared transmission spectroscopy, spectral bands are usually measured in terms of absorptance, which according to Beer's law is proportional to the concentration of the functional group giving rise to the absorption bands in the spectrum. In the case of coals, the effects of unknown extinction coefficients and thickness variations can be eliminated by using the ratio of absorptances of different spectral bands.
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