Electrical Capacitance Tomography for visualization of combustion process is based on measurement of variation of electrical properties of flame, such as electrical permittivity and conductivity of the reaction the zone. The signal level depends on the concentration of various charged particles in the combustion zone. Possible carriers are electrons and positive and negative ions. These charged particles may be formed as a result of chemical reactions, which are called chemi-ionization and thermal ionization. These properties in a combustion chamber are measured with specially designed electrodes. Distribution of charged particles in the combustion zone is reconstructed from measurements of electrical signal from the electrodes using linear back projection or iterative linear back projection algorithm.