[Détection d'explosives par l'imagerie térahertz à ouverture synthétique : mise au point et classification spectrale]
Nous nous intéressons ici à la détection d'armes et de substances explosives par l'imagerie térahertz à ouverture synthétique. Dans cette technique, le front d'onde THz réfléchi par l'objet observé présente une déformation importante qui doit être prise en compte dans la reconstruction de l'image. Il en découle que le détecteur matriciel doit être situé à une distance spécifique pour corriger l'effet de cette déformation. En plus de la correction du front d'onde, la détection d'explosifs demande une analyse spectrale de l'image. Nous montrons, en prenant comme exemple l'explosif C4, que la méthode de cartographie auto-organisée de Kohonen constitue un outil efficace pour différencier la signature spectrale des explosifs de celle de l'environnement.
In the adaptation of Terahertz (THz) synthetic aperture imaging to stand-off screening of concealed weapons and explosives, the incoming THz wavefronts exhibit significant curvature that must be considered in the image reconstruction. Consequently, the imaging array must be focused at a specific distance to correct for the wavefront curvature. In addition to the focusing correction, detection of explosives requires spectral analysis of the reconstructed THz image. Kohonen self-organizing maps are shown to be promising tools for differentiating the spectral signature of C4 explosive from the reflection spectra of metal and semi-transparent barrier materials.
Mot clés : Térahertz, Cartographie de Kohonen, Ouverture synthétique
@article{CRPHYS_2008__9_2_248_0,
author = {Alexander Sinyukov and Ivan Zorych and Zoi-Heleni Michalopoulou and Dale Gary and Robert Barat and John F. Federici},
title = {Detection of explosives by {Terahertz} synthetic aperture imaging{\textemdash}focusing and spectral classification},
journal = {Comptes Rendus. Physique},
pages = {248--261},
publisher = {Elsevier},
volume = {9},
number = {2},
year = {2008},
doi = {10.1016/j.crhy.2007.09.013},
language = {en},
}
TY - JOUR AU - Alexander Sinyukov AU - Ivan Zorych AU - Zoi-Heleni Michalopoulou AU - Dale Gary AU - Robert Barat AU - John F. Federici TI - Detection of explosives by Terahertz synthetic aperture imaging—focusing and spectral classification JO - Comptes Rendus. Physique PY - 2008 SP - 248 EP - 261 VL - 9 IS - 2 PB - Elsevier DO - 10.1016/j.crhy.2007.09.013 LA - en ID - CRPHYS_2008__9_2_248_0 ER -
%0 Journal Article %A Alexander Sinyukov %A Ivan Zorych %A Zoi-Heleni Michalopoulou %A Dale Gary %A Robert Barat %A John F. Federici %T Detection of explosives by Terahertz synthetic aperture imaging—focusing and spectral classification %J Comptes Rendus. Physique %D 2008 %P 248-261 %V 9 %N 2 %I Elsevier %R 10.1016/j.crhy.2007.09.013 %G en %F CRPHYS_2008__9_2_248_0
Alexander Sinyukov; Ivan Zorych; Zoi-Heleni Michalopoulou; Dale Gary; Robert Barat; John F. Federici. Detection of explosives by Terahertz synthetic aperture imaging—focusing and spectral classification. Comptes Rendus. Physique, Volume 9 (2008) no. 2, pp. 248-261. doi : 10.1016/j.crhy.2007.09.013. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.09.013/
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