Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Spectral Selective Device for Diagnostics of Combustion of Gaseous Hydrocarbon Fuel M.A. VAGANOV In this work, to solve the problem of diagnostics the combustion of gaseous hydrocarbon fuel, namely propane, it is proposed to use the methods of applied optical spectroscopy, while the diagnostic device is a spectrally selective device that performs spectral measurements in predetermined ranges of the optical range using a set of narrow-band interference optical filters tuned to specific wavelengths. The results of an experimental study of this device in the framework of solving the problem of diagnostics of combustion of gaseous hydrocarbon fuel are presented. Keywords: optical spectroscopy; hydrocarbon gas; combustion processes; diagnostic device; multichannel spectrometer; spectroscopic informative properties; narrow-band optical filter. DOI: 10.25791/pribor.5.2021.1256 Pp. 01-07.