Gaseous pollutants monitoring systems

Werle, P., R. Muecke, and F. Slemr, Development of a Prototype IR-FM Absorption Spectrometer Design Criteria and System Performance, in Monitoring of Gaseous Pollutants by Tunable Diode Lasers (R. Grisar, H. Boettner, M. Tacke and G. Restelli, Eds.), pp. 169-182, Kluwer Academic, Dordrecht, The Netherlands, 1992. 

Laser PAS has been used to monitor air samples. Minimum detectable concentrations of gaseous pollutants are often in the parts per billion (ppb) or sub-ppb range depending on the molecular absorption cross section and on possible absorption interferences. Most studies have been devoted to investigations on collected air samples of different origin. A CO laser-based PAS has been used for analysis of vehicular exhausts. A number of compounds such as nitric oxide, nitrogen dioxide, H2O vapor, and other volatile organic compounds such as alkenes, aromatic hydrocarbons, and aldehydes have been reported. A mobile PAS system has been developed for analysis in the field. 

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