The diode laser technique with the use of a high-sensitive methane detector is suggested for studying methane concentration in coal samples and kinetics of its outflow into the atmosphere. The technique is characterized by high measurement accuracy, the ease of the experiment, and a small amount of coal samples required for the analysis. Measurement results on the methane evolution from coal samples of the Kuzbas coal beds are given and the kinetics of its outflow into the atmosphere is described. The level of methane residual of a coal sample is determined as 2.06 • 10-4 kg/kg.
diode laser detector, carbon methane, concentration measurement