Tunable diode-laser-based measurements of a gas flux emanating from a two-dimensional surface

Heather A Gamble; Yongsheng Feng; Xiaomei Li; Harold I. Schiff; Gervase I. Mackay

doi:10.1117/12.474037

17 February 2003 Tunable diode-laser-based measurements of a gas flux emanating from a two-dimensional surface

Heather A Gamble, Yongsheng Feng, Xiaomei Li, Harold I. Schiff, Gervase I. Mackay

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.

Citation Download Citation

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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