Share Email Print

Proceedings Paper

Active infrared multispectral imaging of chemicals on surfaces
Author(s): Anish K. Goyal; Melissa Spencer; Michael Kelly; Joseph Costa; Michael DiLiberto; Emily Meyer; Thomas Jeys
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We investigated the signature phenomenology of long-wave infrared (LWIR) reflectance of contaminated surfaces using a quantum-cascade laser (QCL) that tunes from λ = 9.1 to 9.8 μm and a HgCdTe focal-plane-array (FPA) with custom read-out integrated circuit (ROIC). A liquid chemical, diethyl phthalate (DEP), was applied to a variety of substrates such as diffusely reflecting gold, concrete, asphalt, and sand. Multispectral image-cubes of the scattered radiation were generated over 81 wavelengths in steps of 1 cm-1 at standoff distances ranging from 0.1 to 5 meters. For idealized substrates such as diffusely reflecting gold, the experimentally measured signatures are in good agreement with theoretical calculations. Clear signatures were also obtained for contaminated concrete, asphalt, and sand. These measurements demonstrate the potential of this technique for detecting and classifying chemicals on native outdoor surfaces.

Paper Details

Date Published: 3 June 2011
PDF: 11 pages
Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 80180N (3 June 2011); doi: 10.1117/12.882698
Show Author Affiliations
Anish K. Goyal, MIT Lincoln Lab. (United States)
Melissa Spencer, MIT Lincoln Lab. (United States)
Michael Kelly, MIT Lincoln Lab. (United States)
Joseph Costa, MIT Lincoln Lab. (United States)
Michael DiLiberto, MIT Lincoln Lab. (United States)
Emily Meyer, MIT Lincoln Lab. (United States)
Thomas Jeys, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 8018:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII
Augustus W. Fountain III; Patrick J. Gardner, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?