Study on Hyperspectral Remote Sensing Based Rapid Determination of Coal Quality Parameters

In this research work, reflectance spectroscopy of Jharia and Raniganj coal samples across the Vis–NIR–SWIR range (wavelength: 350–2500 nm) were investigated in conjugation with coal properties to construct a spectral-compositional relationship. Several pre-processing approaches were applied to each spectrum for measuring the band depth of absorption features. Reflectance spectra of coal in the 350–2500 nm region demonstrate a number of absorption characteristics attributable to organic and inorganic compounds. In this spectral-proximate relationship study, coal volatile matter and ash content are captured with correlation coefficient (r) of 0.85 and 0.84 at band depth of 2300 nm and 2200 nm. Whereas for gross calorific value, moisture, fixed carbon, and fuel ratio show correlation coefficient values (r) of 0.82, 0.79, 0.79, and 0.79 at band depth of 2300 nm, 1900 nm, and 2200 nm, respectively.