Standoff detection of explosives: a challenging approach for optical technologies
2011
Standoff detection of explosives residues on surfaces at few meters was made using optical technologies based on
Raman scattering, Laser-Induced Breakdown Spectroscopy (LIBS) and passive standoff FTIR radiometry. By
comparison, detection and analysis of nanogram samples of different explosives was made with a microscope
system where Raman scattering from a micron-size single point illuminated crystal of explosive was observed.
Results from standoff detection experiments using a telescope were compared to experiments using a microscope to
find out important parameters leading to the detection. While detection and spectral identification of the micron-size
explosive particles was possible with a microscope, standoff detection of these particles was very challenging due to
undesired light reflected and produced by the background surface or light coming from other contaminants. Results
illustrated the challenging approach of detecting at a standoff distance the presence of low amount of micron or submicron
explosive particles.
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