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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 25 — Sep. 1, 2007
  • pp: 6323–6329

In situ infrared aerosol spectroscopy for a variety of nerve agent simulants using flow-through photoacoustics

Kristan P. Gurton, Melvin Felton, Rachid Dahmani, and David Ligon  »View Author Affiliations


Applied Optics, Vol. 46, Issue 25, pp. 6323-6329 (2007)
http://dx.doi.org/10.1364/AO.46.006323


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Abstract

We present newly measured results of an ongoing experimental program established to measure optical cross sections in the mid- and long-wave infrared for a variety of chemically and biologically based aerosols. For this study we consider only chemically derived aerosols, and in particular, a group of chemical compounds often used as simulants for the detection of extremely toxic organophosphorus nerve agents. These materials include: diethyl methylphosphonate (DEMP), dimethyl methylphosphonate (DMMP), diisopropyl methylphosphonate (DIMP), and diethyl phthalate (DEP). As reported in a prior study [Appl. Opt. 44, 4001 (2005)], we combine two optical techniques well suited for aerosol spectroscopy [i.e., flow-through photoacoustics and Fourier transform infrared (FTIR) emission spectroscopy], to measure in situ the absolute extinction and absorption cross sections over a variety of wavelengths spanning the IR spectral region from 3 to 13 μ m . Aerosol size distribution(s), particle number density, and dosimetric measurements are recorded simultaneously in order to present optical cross sections that are aerosol mass normalized, i.e., m 2 / gram . Photoacoustic results, conducted at a series of CO 2 laser lines, compare well with measured broadband FTIR spectral extinction. Both FTIR and photoacoustic data also compare well with Mie theory calculations based on measured size distributions and previously published complex indices of refraction.

© 2007 Optical Society of America

OCIS Codes
(010.1100) Atmospheric and oceanic optics : Aerosol detection
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(300.1030) Spectroscopy : Absorption
(300.6170) Spectroscopy : Spectra
(300.6430) Spectroscopy : Spectroscopy, photothermal
(010.1030) Atmospheric and oceanic optics : Absorption

ToC Category:
Spectroscopy

History
Original Manuscript: April 5, 2007
Revised Manuscript: June 6, 2007
Manuscript Accepted: June 26, 2007
Published: August 24, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Kristan P. Gurton, Melvin Felton, Rachid Dahmani, and David Ligon, "In situ infrared aerosol spectroscopy for a variety of nerve agent simulants using flow-through photoacoustics," Appl. Opt. 46, 6323-6329 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-25-6323

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