Passive Remote Monitoring of Chemical Vapours by Differential FTIR Radiometry – Results at a Range of 1.5 km


  1. Thériault, J-M.
  2. Puckrin, E.
  3. Bouffard, F.
  4. Déry, B.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
The method for passive remote monitoring of chemical vapours by differential FTIR radiometry is extended to determining the characteristics of a distant plume stack. This measurement technique is based on the use of a double-beam Fourier-transform infrared spectrometer optimized for optical subtraction. The method is described with a particular emphasis put on its monitoring capabilities. The algorithm developed for on-line detection, identification and quantification of chemical vapour plumes is revisited. The analysis focuses essentially on experimental results obtained at a recent field trial for vapour plume mixtures of DMMP and SF sub 6 probed at a distance of 1.5 km. The accuracy of the simplified plume radiance model implemented in the detection algorithm is specifically addressed. The measurement technique has been successfully used to detect and identify low, medium and high concentrations of vapour mixtures but appears to have limited quantification capabilities in its present form. Significant background spectral features in the differential spectra near 890 cm (exp(-1) )and 1050 cm (exp(-1)) have been attributed to the presence of calcite and ozone.

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Fourier Transform Infrared Spectroscopy;Atmospheric sounder;DMMPA;SF6;Chemical plume
Report Number
DRDC-VALCARTIER-TM-2002-161 — Technical Memorandum
Date of publication
23 Jun 2003
Number of Pages
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