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Proceedings Paper

Infrared/terahertz double resonance for chemical remote sensing: signatures and performance predictions
Author(s): Dane J. Phillips; Elizabeth A. Tanner; Henry O. Everitt; Ivan R. Medvedev; Christopher F. Neese; Jennifer Holt; Frank C. De Lucia
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Paper Abstract

Single resonance chemical remote sensing, such as Fourier-transform infrared spectroscopy, has limited recognition specificity because of atmospheric pressure broadening. Active interrogation techniques promise much greater chemical recognition that can overcome the limits imposed by atmospheric pressure broadening. Here we introduce infrared - terahertz (IR/THz) double resonance spectroscopy as an active means of chemical remote sensing that retains recognition specificity through rare, molecule-unique coincidences between IR molecular absorption and a line-tunable CO2 excitation laser. The laser-induced double resonance is observed as a modulated THz spectrum monitored by a THz transceiver. As an example, our analysis indicates that a 1 ppm cloud of CH3F 100 m thick can be detected at distances up to 1 km using this technique.

Paper Details

Date Published: 26 April 2010
PDF: 12 pages
Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 76710F (26 April 2010); doi: 10.1117/12.853309
Show Author Affiliations
Dane J. Phillips, Kratos Defense-Digital Fusion (United States)
Univ. of Alabama in Huntsville (United States)
Elizabeth A. Tanner, Kratos Defense-Digital Fusion (United States)
Henry O. Everitt, U.S. Army Aviation and Missile Research, Development and Engineering Ctr. (United States)
Ivan R. Medvedev, The Ohio State Univ. (United States)
Christopher F. Neese, The Ohio State Univ. (United States)
Jennifer Holt, The Ohio State Univ. (United States)
Frank C. De Lucia, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 7671:
Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense
Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe, Editor(s)

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