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Development of an Imaging-DOAS System for 2-D Remote Sensing of Atmospheric Gases  

Lee, Han-Lim (Advanced Environmental Monitoring Research Center(ADEMRC), Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology(GIST))
Lee, Chul-Kyu (Advanced Environmental Monitoring Research Center(ADEMRC), Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology(GIST))
Jung, Jin-Sang (Advanced Environmental Monitoring Research Center(ADEMRC), Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology(GIST))
Park, Jeong-Eun (Advanced Environmental Monitoring Research Center(ADEMRC), Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology(GIST))
Kim, Young-Joon (Advanced Environmental Monitoring Research Center(ADEMRC), Department of Environmental Science & Engineering, Gwangju Institute of Science & Technology(GIST))
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.2, 2006 , pp. 150-157 More about this Journal
Abstract
Spatially resolved remote identification and quantification of trace gases in the atmosphere is desirable in various fields of scientific research as well as in public security and industrial contexts. Environmental observations investigating causes, extent md consequences of air pollution are of fundamental interest. We present an Imaging-DOAS system, a ground based remote sensing instrument that allows spatially resolved mapping of atmospheric trace gases by a differential optical absorption spectroscopy(DOAS) with sun scattered light as the light source. A passive DOAS technique permits the identification and quantification of various gases, e.g., $NO_2,\;SO_2,\;and\;CH_2O$, from their differential absorption structures with high sensitivity. The Imaging-DOAS system consists of a scanning mirror, a focusing lens, a spectrometer, a 2-D CCD, ad the integral control software. An imaging spectrometer simultaneously acquires spectral information on the incident light in one spatial dimension(column) and sequentially scans the next spatial dimension with a motorized scanning mirror. The structure of the signal acquisition system is described in detail and the evaluation method is also briefly discussed. Applications of imaging of the $NO_2$ contents in the exhaust plumes from a power plant are presented.
Keywords
Remote Sensing; DOAS; Stack Plume; $NO_2$;
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