Performance Comparison of Real-Time Laser Absorption Spectrometers for NH<SUB>3</SUB> Detection at 1.54 and 3.03μm in a H<SUB>2</SUB>O Vapor Mixture

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  • Laser original: Performance comparison of real-time laser absorption spectrometers for NH3 detection at 1.54 and 3.03 μm in a H2O vapor mixture
  • Laser original Performance comparison of real time laser absorption spectrometers for NH3 detection at 1 54 and 3 03 ミュー m in a H2O vapor mixture

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Abstract

We described the demonstration of real-time NH3 detection with simulated flue gas conditions containing H2O and CO2 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 NH3 absorption in the 1.5μm region, and measurement sensitivity was compared in detail for absorption intensity and spectral interference associated with pressure broadening. Rapid NH3 detection with total measurement response time less than 10 seconds was achieved completely interference free from H2O and CO2 absorption spectra resulting in minimum detectable concentration of 0.7 ppm at 6510.986cm-1 and 2ppm at 3295.388cm-1 at an elevated gas temperature of 400 K.

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