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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 61,
  • Issue 6,
  • pp. 630-637
  • (2007)

Remote Monitoring of Multi-gas Mixtures by Passive Standoff Fourier Transform Infrared Radiometry

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Abstract

The passive remote monitoring of multi-gas mixtures was experimentally investigated using Fourier transform infrared (FT-IR) radiometry. The spectral radiance data were collected using a dual-port radiometrically balanced interferometer for a variety of multi-gas plumes at a standoff distance of 60 m. Two basic sets of mixtures were studied. The first set corresponded to mixtures consisting of three gases with no overlapping spectral bands (C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>4</sub>, and R14). The second set corresponded to mixtures of three gases having significant spectral overlap (C<sub>2</sub>H<sub>4</sub>, R114, and R134a). For each mixture the flow rates of individual constituents were adjusted to yield specific constituent optical-density (CL) ratios. These ratios were compared to the optical-density ratios retrieved from the measured infrared radiance spectra. Results of this study indicated that for both sets of multi-gas mixtures the optical-density ratios retrieved by the passive remote monitoring technique were in good agreement with those derived from the release flow rates, provided that a simple correction scheme was introduced to compensate for the limited accuracy of the fast radiance model implemented in the monitoring algorithm.

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