Establishment and Effect Analysis of Greenhouse Gas Detection Based on Photoacoustic Spectroscopy Technology
Under the dual carbon target,the online long-term stability monitoring technology of greenhouse gases is an important guarantee for comprehensively mastering greenhouse gas emissions and their environmental and climate effects,and predicting future change trends.In order to monitor the concentration and change trend of greenhouse gases in industrial production sites and other environments in real time and online,and take corresponding measures in time,based on the analysis of the generation mechanism of photoacoustic spectral signals and the monitoring principle of multi-component gas mixture,the absorption spectral characteristics of greenhouse gases were analyzed according to the main components of greenhouse gases,and the qualitative and quantitative monitoring technology of multi-component greenhouse gases based on photoacoustic spectroscopy,an online monitoring experimental platform for greenhouse gas photoacoustic spectroscopy was set up to analyze the internal noise of the monitor,environmental temperature,humidity and other external influencing factors,and the test data was analyzed through on-site testing,and the impact of internal and external factors was reduced with adsorption method.The results showed that the symmetrical installation of microphone and non resonant optical acoustic cavity could effectively reduce the influence of external noise on the test results;The air purifier could reduce the influence of water vapor and other gases in the air on the test results;The deviation of low and high concentration mixed gas monitoring results was less than 0.5,and the deviation from GC test results was less than 10%.The environmental greenhouse gas monitoring technology using photoacoustic spectroscopy has wide monitoring range,good selectivity,and monitoring accuracy of 10-6,which is suitable for online monitoring of environmental greenhouse gas content.
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