Journal Highlight: Effect of gas cell pressure in FTIR analysis of fire effluents

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  • Published: Nov 15, 2015
  • Author: spectroscopyNOW
  • Channels: Infrared Spectroscopy
thumbnail image: Journal Highlight: Effect of gas cell pressure in FTIR analysis of fire effluents
The experimental and numerical evaluation of pressure effects in the FTIR analysis of fire effluent gases has been examined, including the feasibility and limitations of pressure corrections.

Effect of gas cell pressure in FTIR analysis of fire effluents

Fire and Materials, 2015, 39, 675-684
Eric Guillaume, Laurent Saragoza, Kaoru Wakatsuki and Per Blomqvist

Abstract: The analysis of fire effluents using Fourier Transform Infrared Spectroscopy (FTIR) is increasing in the field of fire science. This technique is very powerful and may be very selective and precise if the FTIR instrument is properly calibrated. However, results are sensitive to instrumental parameters, including especially pressure effects on the contents in the measurement cell. This communication presents experimental and numerical evaluation of pressure effects in FTIR analysis, and an evaluation of the feasibility and limitation of pressure corrections. The work performed concerns experimental measurements on pressure influence with four different gases, at different levels of concentration, and for one of the gases with different equipment from two laboratories. Some of these results are compared with theoretical models obtained from HITRAN database. Finally, this communication proposes limitations to the range of validity of correction if the actual pressure and the pressure for calibration differ, and suggests a tolerance of ±10 Torr on pressure variation for application of the method.

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