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Proceedings Paper

Mid-infrared backscattering measurements of building materials using a quantum cascade laser
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Paper Abstract

Open-path quantum cascade laser (QCL) systems are being developed for remote environmental monitoring applications for detection of small levels of toxins or pollutant gases in ambient air. In monostatic systems that rely on topographic backscatter, the surface reflection of the target becomes important. To address the feasibility of natural targets in an open-path geometry, we present the backscattering measurements of common urban building materials (aluminum, natural stones, ceramic wall tiles and concrete block) using a distributed feedback (DFB) pulsed QCL. Real surface roughness in the materials was taken into account. In particular, oblique scattering cases which are often unavoidable in field measurements were also investigated. The QCL measurements were evaluated with a FTIR system in which wide frequency range (2.8μm - 25μm) measurements were possible. These results were applied to a total link model to define the potential and range of an open path QCL chemical sensor system.

Paper Details

Date Published: 4 May 2010
PDF: 8 pages
Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 766043 (4 May 2010); doi: 10.1117/12.852679
Show Author Affiliations
Maung Lwin, The City College of New York (United States)
Paul Corrigan, The City College of New York (United States)
Barry Gross, The City College of New York (United States)
Fred Moshary, The City College of New York (United States)
Samir Ahmed, The City College of New York (United States)


Published in SPIE Proceedings Vol. 7660:
Infrared Technology and Applications XXXVI
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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