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Deep Raman spectroscopy for the non-invasive standoff detection of concealed chemical threat agents
- Source :
- Talanta. 94:342-347
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Deep Raman spectroscopy has been utilized for the standoff detection of concealed chemical threat agents from a distance of 15 meters under real life background illumination conditions. By using combined time and space resolved measurements, various explosive precursors hidden in opaque plastic containers were identified non-invasively. Our results confirm that combined time and space resolved Raman spectroscopy leads to higher selectivity towards the sub-layer over the surface layer as well as enhanced rejection of fluorescence from the container surface when compared to standoff spatially offset Raman spectroscopy. Raman spectra that have minimal interference from the packaging material and good signal-to-noise ratio were acquired within 5 seconds of measurement time. A new combined time and space resolved Raman spectrometer has been designed with nanosecond laser excitation and gated detection, making it of lower cost and complexity than picosecond-based laboratory systems.
- Subjects :
- Time Factors
Explosive material
Opacity
Analytical chemistry
Signal-To-Noise Ratio
Spectrum Analysis, Raman
Nitroparaffins
Analytical Chemistry
symbols.namesake
Optics
Explosive Agents
Interference (communication)
Humans
Chemical Warfare Agents
Surface layer
Nitrates
business.industry
Chemistry
Lasers
Spatially offset Raman spectroscopy
Picosecond
symbols
Barium Sulfate
business
Raman spectroscopy
Methane
Excitation
Subjects
Details
- ISSN :
- 00399140
- Volume :
- 94
- Database :
- OpenAIRE
- Journal :
- Talanta
- Accession number :
- edsair.doi.dedup.....5fb33c476165bcba9bcfa2c86d76c095