Method and device for measuring the concentration of exhaust gases of a boiler

摘要

A device for measuring the concentration (C) of at least one gas species of the exhaust gases of a boiler, this device being equipped with a measuring duct (2) through which the flow (EG) of the exhaust gases leaving the boiler passes; a light source (9) to transmit a light signal (LS) along an optical path (P) extending inside the measuring duct (2) of fixed length (L), this light signal (LS) having a fixed incident intensity (I0) at the inlet (7) of the optical path (P); an optical sensor (10) to detect the light signal (LS) at the outlet (8) of the optical path (P); and a signal processing stage (14 and 15) to process, in electrical form, the detected light signal (LS) and provide a processed signal (ES) that represents a measurement of the concentration (C) of the gas species related to the incident intensity value (I0) and the length (L) of the optical path (P).