The principal possibility to recognize liquid explosives and their components in various
glass and plastic containers with different transparency in visible spectral range was demonstrated.
Acetone was used as a target, as alone and mixed with traditional liquids. The advantage of gated
Raman spectroscopy over the CW was proved. It was found that using 532 nm, 6 ns laser pulses any
real target with characteristic Raman spectrum with intensity similar to those for acetone may be
detected in 100 % of glass and in 80 % of plastic containers. The mixing with different liquid makes
detection more difficult and acetone was detected in 55 % of studied cases. The main reasons for
detection difficulties are intrinsic Raman and luminescence of plastic containers and liquids relevant
to airport passengers. In case of strong luminescence the advantages of red light excitation over
green light was demonstrated.
Real time detection and identification of explosives at a standoff distance is a major issue in efforts
to develop defense against so-called Improvised Explosive Devices (IED). It is recognized that the only
technique, which is potentially capable to standoff detection of minimal amounts of explosives is laser-based
spectroscopy. LDS activity is based on a combination of laser-based spectroscopic methods with orthogonal
capabilities. Our technique belongs to trace detection, namely to its micro-particles variety. It is based on
commonly held belief that surface contamination was very difficult to avoid and could be exploited for standoff
detection. We has applied optical techniques including gated Raman and time-resolved luminescence
spectroscopy for detection of main explosive materials, both factory and homemade. We developed and tested a
Raman system for the field remote detection and identification of minimal amounts of explosives on relevant
surfaces at a distance of up to 30 meters.
Real time detection and identification of explosives at a standoff distance is a major issue in efforts
to develop defense against so-called Improvised Explosive Devices (IED). It is recognized that the only
technique, which is potentially capable to standoff detection of minimal amounts of explosives is laser-based
spectroscopy. LDS technique belongs to trace detection, namely to its micro-particles variety. We
applied gated Raman and time-resolved luminescence spectroscopy for detection of main explosive
materials, both factory and homemade. Raman system was developed and tested by LDS for field remote
detection and identification of minimal amounts of explosives on relevant surfaces at a distance of up to
30 meters.
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