Laser Remote Sensing Method of Carbon Monoxide Emissions Detection

Abstract

Monitoring of atmospheric gas pollution is one of the most important environmental target. Laser methods are the most effective for remote operational monitoring of atmospheric pollution.One of the most important air pollutants is carbon monoxide.The article analyzes the possibility of laser remote sensing method of carbon monoxide emissions detection in atmosphere.The information parameter measured by the remote sensing laser gas analyzer was assessed for absorption band of carbon monoxide near 2,3 μm.The information parameter that can be used for monitoring monoxide emissions is the ratio of the power of laser signals at the wavelengths 4295 cm-1 and 4370 cm-1.Results of calculations of the information parameter for different sizes of emissions (from 1 m to 100 m) and different content of carbon monoxide in the emission (from 0.01 % to 10 %) were showed.Comparing the information parameter R with its background value shows that carbon monoxide emissions can be monitored.Mathematical modeling was performed for quantitative estimation the reliability of detecting carbon monoxide emissions.The probability of correctly emission detecting (emission detecting when there is one) and the probability of false alarms (emission detecting when there is none) were calculated.Mathematical modelling shows that a laser gas analyzer allows us to detect the carbon monoxide emissions with correct detection probability not less 0,845 and false alarm probability no more 0,243 for carbon monoxide emissions with gas concentration not less  0,1 %  and dimension of emissions cloud not less 10 m. For carbon monoxide emissions with gas concentration not less 1 % and dimension of emissions cloud not less 5 m a laser gas analyzer allows us to detect the carbon monoxide emissions with correct detection probability not less  0,999 and false alarm probability no more 0,001.