期刊
APPLIED SPECTROSCOPY
卷 73, 期 6, 页码 601-609出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0003702818792289
关键词
Trace detection; standoff detection; explosive; trinitrotoluene; TNT; pentaerythritol tetranitrate; PETN; ammonium nitrate; deep ultraviolet; photoacoustic spectroscopy; photochemistry; photolysis
资金
- Office of Naval Research (ONR) [N00014-16-1-2681]
We demonstrate deep ultraviolet (UV) photoacoustic spectroscopy (PAS) of trace explosives using a sensitive microphone at meter standoff distances. We directly detect 10 mu g/cm(2) of pentaerythritol tetranitrate (PETN), 2,4,6-trinitrotoluene (TNT), and ammonium nitrate (AN) with 1s accumulations from a 3m standoff distance. Large PAS signals for standoff detection are achieved by exciting into the absorption bands of the explosives with a 213nm laser. We also investigate the impact of the deep UV photochemistry of AN on the PAS signal strength and stability. We find that production of gaseous species during photolysis of AN enhances the PAS signal strength. This deep UV photochemistry can, however, limit the PAS signal lifetimes when detecting trace quantities.
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