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In this paper a low-cost, low-complexity photoacoustic sensing system for the simultaneous detection of CO 2  and NO 2  in exhaust gas is presented. The proposed system is designed as part of a Continuous Emissions Monitoring System for gas turbine emissions. The system exploits the amplification of the photoacoustic signal provided by an acoustic ring resonator, which is characterized by a simple and robust structure and is suitable for in-field measurements. The dual gas detection is obtained by exploiting two measurement principles, the first one, dedicated to the detection of NO 2  which is present in the target mixture in the ppm range, is the classical PA effect. In fact, the optical source is a light emitting diode with a center wavelength of 405 nm matched on an adsorption peak of NO 2 . This allows for deriving the NO 2  concentration measurement directly from the amplitude of the photoacoustic signal. The other mechanism is used to measure the concentration of one of the major components of the exhaust gas, with a concentration in the range of some percents. The quantity of CO 2  is sensed exploiting its effect on the sound speed, and consequently on the resonance frequency of the resonator. To measure the CO 2  concentration the system automatically tracks the acoustic resonance shift. The detection of the two gases is realized simultaneously by a unique sensor with real time measurements. A laboratory characterization of the proposed systems showed its feasibility. Experimental results show the possibility to detect NO 2  with a resolution lower than 1 ppm whereas CO 2  resolution is about 0.2%.

A photoacoustic based measurement system for dual detection of NO2 and CO2 in combustion exhaust gases