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Proceedings Paper

Performance trade-off modeling for a handheld FTIR spectrometric vapor identifier
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Paper Abstract

Emerging chemical threats to homeland security challenge the specificity of sensor-based chemical detectors. As the number of chemicals to detect increases, the false alarm rates of these sensor-based systems tend to increase and the usefulness of the detector in real world situations declines. The infrared (IR) absorption spectrum of a material is a physical constant and highly specific for the molecule of interest. For many years, IR spectra have been used by chemists to identify unknowns based on comparison with spectra of known materials and to determine the presence of chemical functional groups through spectral interpretation. IR spectroscopy is well suited for the identification of broad-based chemical threats. This discussion shall concern the conceptual development of a hand held IR spectroscopy system for the identification of chemical vapor threats. The discussion shall focus on design tradeoffs where miniaturization is of paramount importance. Quantitative IR absorption spectra of threat compounds were used to model absorption line strengths at moderate spectral resolutions. IDLH detection limits targets, acquisition time, etendué, and signal-to-noise parameters guided the concept design and pathlength of a long path gas cell used in conjunction with a hand held FT-IR spectrometer.

Paper Details

Date Published: 28 April 2010
PDF: 10 pages
Proc. SPIE 7680, Next-Generation Spectroscopic Technologies III, 76800R (28 April 2010); doi: 10.1117/12.850365
Show Author Affiliations
David W. Schiering, Smiths Detection, Inc. (United States)
Josep Arnó, Smiths Detection, Inc. (United States)
Robert G. Messerschmidt, Reflective Sciences, Inc. (United States)
Peng Zou, Smiths Detection, Inc. (United States)


Published in SPIE Proceedings Vol. 7680:
Next-Generation Spectroscopic Technologies III
Mark A. Druy; Christopher D. Brown; Richard A. Crocombe, Editor(s)

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