Abstract
The paper presents application of fiber optic flame monitoring system and its signals analysis for estimation thermal power and air-fuel ratio of single burner that are hard to determine. To achieve this, several combustion tests were conducted for nine different settings of the laboratory combustion facility, where thermal power and excess air coefficient were kept constant and set independently for known biomass content. Thermal power was regulated by adjusting fuel flow rate knowing the heating value of the known fuel blend. The fiber optic probe was capable to monitor several zones of the flame located along the axis of the flame. The k-NN regression algorithm was applied to determine thermal power and air-fuel ratio.