A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Active Infrared Multispectral Imaging of Chemicals on Surfaces
We investigated the signature phenomenology of long-wave infrared (LWIR) reflectance of contaminated surfaces using a quantum-cascade laser (QCL) that runes from n = 9.1 to 9.8 um 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(caret)-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.
Active Infrared Multispectral Imaging of Chemicals on Surfaces
We investigated the signature phenomenology of long-wave infrared (LWIR) reflectance of contaminated surfaces using a quantum-cascade laser (QCL) that runes from n = 9.1 to 9.8 um 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(caret)-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.
Active Infrared Multispectral Imaging of Chemicals on Surfaces
A. K. Goyal (author) / M. Spencer (author) / M. Kelly (author) / J. Costa (author) / M. DiLiberto (author)
2011
12 pages
Report
No indication
English
Optical Detection , Chemical detection , Classification , Surfaces , Asphalt , Concrete , Contamination , Ethyl radicals , Focal plane arrays , Gold , Hyperspectral imagery , Infrared images , Infrared spectroscopy , Integrated circuits , Mass spectrometry , Military applications , Quantum optics , Read out techniques , Reflectance , Sand , Substrates
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