Development of Carbon Dioxide Detection Device Based on Mid-Infrared Cavity Decay Spectroscopy Technology
With the rapid development of the nuclear industry,the amount of waste to be treated and monitored increases,and the potential emissions will also increase,and C-14 needs to be monitored.C-14 produced by nuclear facilities is mainly combined with CO2,so sensitive monitoring of 14CO2 gas is of great significance.In this paper,cavity ring-down spectroscopy(CRDS)is used to detect the CO2 absorption spectrum by selecting the center wave number of 14CO2 absorption line around 2209.11 cm-1.A CO2 detection system based on mid-infrared cavity ring-down spectroscopy is developed by using a quantum cascade laser in mid-infrared band,an optical resonator,and a reasonable optical path design and gas pipeline design.Based on the developed system,different concentrations of CO2(0.5%-1.3%)were detected,and the experimental data were fitted and analyzed,and the results were found to be consistent with the theoretical formula,which confirmed the feasibility of the developed mid-infrared cavity ring-down spectrum system.The system has successfully realized the accurate measurement of different concentrations of CO2 gas in the mid-infrared band,the absorption spectrum of 14CO2 was measured by mid-infrared cavity ring-down technique,which provides an important technical support and foundation for the future study of laser spectral detection of 14CO2.
mid-infraredcavity ring-down spectroscopyCO2 gas detectiongas analyser development
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