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OPEN PATH TUNABLE DIODE LASER ABSORPTION SPECTROSCOPY FOR ACQUISITION OF FUGITIVE EMISSION FLUX DATA
Thoma*, E D., R C. Shores*, E L. Thompson*, D B. Harris*, S. A. Thorneloe*, R. Varma, R. A. Hashmonay, M. Modrak, D. F. Natschke, AND H. Gamble. OPEN PATH TUNABLE DIODE LASER ABSORPTION SPECTROSCOPY FOR ACQUISITION OF FUGITIVE EMISSION FLUX DATA. T. Keener (ed.), JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION. Air & Waste Management Association, Pittsburgh, PA, 55(5):658-668, (2005).
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Air pollutant emission from unconfined sources is an increasingly important environmental issue. The U.S. EPA has developed a gorund-based optical remote sensing method that enables direct measurement of fugitive emission flux from large area sources. Open-path Fourier transform infrared spectroscopy has been the primary technique for acquisition of pollutant concentration data used in this emission measurement method. For a number of environmentally important compounds, open-path tunable diode laser spectroscopy is shown to be a viable alternative to Fourier transform spectroscopy for pollutant concentration measurements. Near infrared diode laser spectroscopy systems offer significant operational and cost advantages over Fourier transform instruments enabling more efficient implementation of the measurement strategy. This paper reviews the EPA's fugitive emission measurement method and describes its multipath tunable diode laser instrument. Validation testing of the system is discussed and two example applications of tunable diode laser-based fugitive emission measurement are presented.