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Proceedings Paper

Aerosol collection and analysis using diffuse reflectance infrared spectroscopy
Author(s): Alan C. Samuels; Diane M. Wong; Gerald J. Meyer; Geoffrey J. Roelant; Barry R. Williams; Ronald W. Miles; Christopher J. Manning
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Paper Abstract

Infrared spectroscopy is routinely employed for the identification of organic molecules and, more recently, for the classification of biological materials. We have developed a sample collection method that facilitates infrared analysis of airborne particulates using a diffuse reflectance (DR) technique. Efforts are underway to extend the method to include simultaneous analysis of vapor phase organics by using adsorbent substrates compatible with the DR technique. This series of laboratory results provides proof-of-principle for both the sample collection and data collection processes. Signal processing of the DR spectra is shown to provide rapid qualitative identification of representative aerosol materials, including particulate matter commonly found in the environment. We compare the results for such materials as bacterial spores, pollens and molds, clays and dusts, smoke and soot. Background correction analysis is shown to be useful for differentiation and identification of these constituents. Issues relating to complex mixtures of environmental samples under highly variable conditions are considered. Instrumentation development and materials research are now underway with the aim of constructing a compact sampling system for near real-time monitoring of aerosol and organic pollutants. A miniature, tilt-compensated Fourier transform spectrometer will provide spectroscopic interrogation. A series of advanced digital signal processing methods are also under development to enhance the sensor package. The approach will be useful for industrial applications, chemical and biological agent detection, and environmental monitoring for chemical vapors, hazardous air pollutants, and allergens.

Paper Details

Date Published: 13 August 2004
PDF: 9 pages
Proc. SPIE 5416, Chemical and Biological Sensing V, (13 August 2004); doi: 10.1117/12.541868
Show Author Affiliations
Alan C. Samuels, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Diane M. Wong, Johns Hopkins Univ. (United States)
Gerald J. Meyer, Johns Hopkins Univ. (United States)
Geoffrey J. Roelant, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Barry R. Williams, EAI Corp. (United States)
Ronald W. Miles, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Christopher J. Manning, Manning Applied Technology (United States)

Published in SPIE Proceedings Vol. 5416:
Chemical and Biological Sensing V
Patrick J. Gardner, Editor(s)

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