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A portable fluorescence detector for fast ultra trace detection of explosive vapors

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4 Author(s)
Xin, Yunhong ; School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, People''s Republic of China ; He, Gang ; Wang, Qi ; Fang, Yu

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This paper developed a portable detector based on a specific material-based fluorescent sensing film for an ultra trace detection of explosives, such as 2,4,6-trinitrotoluene (TNT) or its derivate 2,4-dinitrotoluene (DNT), in ambient air or on objects tainted by explosives. The fluorescent sensing films are based on single-layer chemistry and the signal amplification effect of conjugated polymers, which exhibited higher sensitivity and shorter response time to TNT or DNT at their vapor pressures. Due to application of the light emitting diode and the solid state photomultiplier and the cross-correlation-based circuit design technology, the device has the advantages of low-power, low-cost, small size, and an improved signal to noise ratio. The results of the experiments showed that the detector can real-time detect and identify of explosive vapors at extremely low levels; it is suitable for the identification of suspect luggage, forensic analyses, or battlefields clearing.

Published in:

Review of Scientific Instruments  (Volume:82 ,  Issue: 10 )

Date of Publication:

Oct 2011

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