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Proceedings Paper

Open path FTIR detection of threat chemicals in air and on surfaces
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Paper Abstract

A remote infrared spectroscopy (RIRS) detection system was assembled using a mid infrared (MIR) Fourier Transform interferometer useful in open-path (OP) mode, a reflective infrared telescope and a cryocooled wide band, MCT detector. The system was used for passive mode IR thermal emission measurements and was also coupled to another Newtonian telescope in conjunction with a globar source for active mode measurements. The operation of the system was validated by measuring RIRS spectra of gases (NH3) and condensable vapors: acetone, dichloromethane, methyl ether and acetonitrile. Solid samples were measured by smearing small amounts on aluminum plates after dissolving in appropriate solvents. Highly energetic compounds: TNT, DNT, PETN and RDX were also detected. Experiments of solids on metal surfaces were carried out in passive and active modes. The analyzed samples were placed at different standoff distances up to a maximum of 30 m in active mode and 60 m in passive mode.

Paper Details

Date Published: 20 May 2011
PDF: 13 pages
Proc. SPIE 8012, Infrared Technology and Applications XXXVII, 801209 (20 May 2011);
Show Author Affiliations
John R. Castro-Suarez, Univ. de Puerto Rico Mayagüez (United States)
Leonardo C. Pacheco-Londoño, Univ. de Puerto Rico Mayagüez (United States)
William Ortiz-Rivera, Univ. de Puerto Rico Mayagüez (United States)
Miguel Vélez-Reyes, Univ. de Puerto Rico Mayagüez (United States)
Max Diem, Northeastern Univ. (United States)
Samuel P. Hernandez-Rivera, Univ. de Puerto Rico Mayagüez (United States)

Published in SPIE Proceedings Vol. 8012:
Infrared Technology and Applications XXXVII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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