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Proceedings Paper

Feasibility study of detection of hazardous airborne pollutants using passive open-path FTIR
Author(s): M. Segal-Rosenheimer; Y. Dubowski; C. Jahn; K. Schäfer; G. Gerl; R. Linker
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Paper Abstract

In recent years open-path FTIR systems (active and passive) have demonstrated great potential and success for monitoring air pollution, industrial stack emissions, and trace gas constituents in the atmosphere. However, most of the studies were focused mainly on monitoring gaseous species and very few studies have investigated the feasibility of detecting bio-aerosols and dust by passive open-path FTIR measurements. The goal of the present study was to test the feasibility of detecting a cloud of toxic aerosols by a passive mode open-path FTIR. More specifically, we are focusing on the detection of toxic organophosphorous nerve agents for which we use Tri-2-ethyl-hexyl-phosphate as a model compound. We have determined the compounds' optical properties, which were needed for the radiative calculations, using a procedure developed in our laboratory. In addition, measurements of the aerosol size distribution in an airborne cloud were performed, which provided the additional input required for the radiative transfer model. This allowed simulation of the radiance signal that would be measured by the FTIR instrument and hence estimation of the detection limit of such a cloud. Preliminary outdoor measurements have demonstrated the possibility of detecting such a cloud using two detection methods. However, even in a simple case consisting of the detection of a pure airborne cloud, detection is not straightforward and reliable identification of the compound would require more advanced methods than simple correlation with spectral library.

Paper Details

Date Published: 24 April 2010
PDF: 13 pages
Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 76730G (24 April 2010); doi: 10.1117/12.850027
Show Author Affiliations
M. Segal-Rosenheimer, Technion-Israel Institute of Technology (Israel)
Y. Dubowski, Technion-Israel Institute of Technology (Israel)
C. Jahn, Karlsruhe Institute of Technology (Germany)
K. Schäfer, Karlsruhe Institute of Technology (Germany)
G. Gerl, Helmholtz Ctr. Munich (Germany)
R. Linker, Technion-Israel Institute of Technology (Israel)


Published in SPIE Proceedings Vol. 7673:
Advanced Environmental, Chemical, and Biological Sensing Technologies VII
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)

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