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17 February 2003 Tunable diode-laser-based measurements of a gas flux emanating from a two-dimensional surface
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Proceedings Volume 4833, Applications of Photonic Technology 5; (2003) https://doi.org/10.1117/12.474037
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada
Abstract
Remote optical techniques are well suited for obtaining representative average values for gas fluxes emanating from a semi-infinite flat surface. Unisearch, the Alberta Reserach Council and the University of Alberta have developed a technique and methodology for making such measurements using a near-IR tunable diode laser analyzer and a set of open path optics. The technqiue uses the LasIR to measure gas concentrations at two different heights along paths which folow the perimeter of a square, flat surface. The measurements are used to calculate a concentration gradient across the height difference. These values, along with air temperature, relative humidity, soil heat flux, net radiation and wind speed/direction data, are then used to calculate the average flux emanating from the surface by applying an integrated flux gradient analysis based on Monin-Obukhov similarity theory. This method was applied to measure fluxes of methane emanating from a 50m × 50m test agricultural plot after the application of manure. Plans are underway to extend the capability of the system to measure up to four different species simultaneously.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Heather A Gamble, Yongsheng Feng, Xiaomei Li, Harold I. Schiff, and Gervase I. Mackay "Tunable diode-laser-based measurements of a gas flux emanating from a two-dimensional surface", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); https://doi.org/10.1117/12.474037
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