Application of optical signals for combustion process diagnosis

The paper presents a short review of diagnostics methods used for pulverized coal combustion and biomass co-combustion processes that utilize information obtained within the visible spectral range. The optical signals can be captured by a multichannel fiber-optic probe that is placed inside a combustion chamber or a borescope with a CMOS camera attached. Particular attention is paid to presenting methods of signal/image processing that could point to potentially undesired states of combustion (co-combustion) process as well as experiments obtained both in laboratory test stand and a power boiler.