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Proceedings Paper

Passive remote detection of atmospheric pollutants using Fourier transform infrared (FTIR) spectroscopy
Author(s): Moira Hilton; Alan H. Lettington; Ian M. Mills
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Paper Abstract

Feasibility studies on the use of passive FTIR spectroscopy for the remote detection of atmospheric pollutants have shown that gases may be identified remotely with an optically modified commercial FTIR spectrometer when only a small 7 degree(s)C) temperature difference exists between the gas and a background IR emitter. A correlation technique was used to extract information from noisy (SNR on the order of magnitude 1) emission spectra from which low temperature differential or low concentration gases or mixtures with interferant species were analyzed. Quantitative measurements of gas concentrations were made by first determining the temperature of the remote gas from rotational line intensity distributions. The product of concentration and pathlength was obtained by comparing the remotely detected emission spectra with simulated spectra obtained from computer models at the measured temperature. Laboratory experiments measured the temperature of CO from its emission spectrum to +/- 5% and the concentration also to +/- 5%. Tomographic reconstructions of molecular distributions within a methane flame have recently been obtained.

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166586
Show Author Affiliations
Moira Hilton, Univ. of Reading (United Kingdom)
Alan H. Lettington, Univ. of Reading (United Kingdom)
Ian M. Mills, Univ. of Reading (United Kingdom)

Published in SPIE Proceedings Vol. 2089:
9th International Conference on Fourier Transform Spectroscopy
John E. Bertie; Hal Wieser, Editor(s)

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