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Recent progress in the development of an atmospheric carbon monoxide (CO) monitoring system using a ~2.33 μm laser absorption sensor is reported. The principles of detection technology and the algorithms used for removing noise are discussed. In order to eliminate the cross interferences from the effects of CO2 and H2O in the atmosphere, a Distributed Feedback (DFB) laser at a specific wavelength of 2330.18 nm was employed in the system. The CO monitoring system demonstrated excellent accuracy and stability in long-term continuous monitoring. The results obtained have validated the use of such a CO monitoring approach in practical gas monitoring applications.

A long-term stable monitoring system for atmospheric carbon monoxide based on 2.3 μm laser absorption