In this article we discuss the main directions of changes in organization of combustion process in industrial power boilers. We describe the fiber optic system permitting the measurement of flicker of the single coal-dust burner as well as the influence of the input conditions (primary air, secondary air) on changes of flicker. The solution operating in boiler in the `Kozienice' Power Plant was shown, as well as examples of measurement results made using a device built by authors. They confirmed the thesis that a flame flicker can be utilized for its quality evaluation.
"Flame flicker measurement in industrial conditions", Proc. SPIE 3730, Optoelectronic and Electronic Sensors III, (30 April 1999); doi: 10.1117/12.346857; https://doi.org/10.1117/12.346857