Abstract
In present time, photoacoustic spectroscopy (PAS) has become a popular technique for measurements of thermal properties of biological, chemical, geological samples. The PAS is suitable for any phase of material such as solid, liquid, gel, suspension and gas etc. In this work authors have fabricated a photoacoustic cell & a pre-amplifier, and optimized both for maximum photoacoustic (PA) signal. Optimum inert cavity volume of the cell was measured to 3.20 × 106 m3. After that, coals samples were collected from five different places of Jharkhand state, India for the study of their quality with PA spectroscopy. The X-ray diffraction (XRD) data has confirmed that four samples have different class of quartz and one sample is very close to kaolinite. The field emission scanning electron microscopy (FE-SEM), and energy dispersive X-ray analysis (EDAX) had shown non-uniform bulk like structure containing various elementals. All samples are distinguished by their quality using PAS and verified them with the Raman spectroscopy. Finally, the authors have measured thermal diffusivity of each samples. The maximum value of thermal diffusivity is measured for kaolinite structure having value of 13.4673 × 10–8 m2/s.
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