Applied Physics B

, Volume 117, Issue 3, pp 847–854 | Cite as

Simultaneous detection of SO2, SO3 and H2O using QCL spectrometer for combustion applications

  • T. HietaEmail author
  • M. Merimaa


We demonstrate a high-sensitivity laser-based spectrometer for simultaneous detection of sulphur dioxide (SO2) sulphur trioxide (SO3) and water for coal-fired combustion applications. The spectrometer is based on a quantum-cascade laser (QCL) operating at 7.16 μm, capable of measuring all three components simultaneously in a single frequency sweep. An optical multipass cell having a total path length of 9.1 m is used at increased temperature and at low pressure to ensure reliable measurement of highly reactive SO3 and adequate separation of overlapping spectral features, respectively. Detection limits for SO2 and SO3 are 0.134 and 0.0073 ppm, respectively, when employing a 20-s sampling time.


Selective Catalytic Reduction Spectral Window Wavelength Modulation Spectroscopy Tuning Rate Multipass Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Centre of Metrology and Accreditation (MIKES)EspooFinland

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