Performance Comparison of Real-Time Laser Absorption Spectrometers for NH_3 Detection at 1.54 and 3.03μm in a H_2O Vapor Mixture
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We described the demonstration of real-time NH<SUB>3</SUB> detection with simulated flue gas conditions containing H<SUB>2</SUB>O and CO<SUB>2</SUB> using direct laser absorption spectrometry. The most appropriate absorption lines at 3.03 and 1.54μm were carefully selected from the HITRAN database and the absorption spectral atlas of NH<SUB>3</SUB> absorption in the 1.5μm region, and measurement sensitivity was compared in detail for absorption intensity and spectral interference associated with pressure broadening. Rapid NH<SUB>3</SUB> detection with total measurement response time less than 10 seconds was achieved completely interference free from H<SUB>2</SUB>O and CO<SUB>2</SUB> absorption spectra resulting in minimum detectable concentration of 0.7 ppm at 6510.986cm<SUP>-1</SUP> and 2ppm at 3295.388cm<SUP>-1</SUP> at an elevated gas temperature of 400 K.
rle 35(3), 173-179, 2007-03-15
The Laser Society of Japan