Method and system for (trace) gas analysis

Details Method and system for (trace) gas analysis Method and system for (trace) gas analysis

G - Physics

01

N

73/55

G01N 21/39 (2006.01) G01N 21/35 (2006.01) G01N 21/31 (2006.01) G01N 21/53 (2006.01)

Patent

CA 1327128

- 23 - Abstract of the Invention Method ant System for (Trace) Gas Analysis What is disclosed is a method and a system for (trace) gas analysis, specifically NH3 analysis in flue gases exhausted from power plants or in industrial waste gases. In this method and system, a laser is reversed between two of its intrinsic resonance lines whereof one wavelength corresponds to an absorption maximum and the other corresponds to an absorption minimum of the gas to be detect- ed. The extinction E and thus the concentration of the gas under analysis is derived from the ra- tio of the values of intensity attenuation at the two wavelengths.

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