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Stand-off detection of trace explosives via resonant infrared photothermal imaging
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View: Figures


Image of FIG. 1.
FIG. 1.

IR transmission spectra of air, TNT, and RDX. Shared absorption bands are highlighted.

Image of FIG. 2.
FIG. 2.

(a) The model used in Eq. (1) . (b) The experimental setup. (c) Transient thermal profile of carbon powder (mesh ) on a copper substrate illuminated with a laser at 1 m stand off. Signal recorded with a LN cooled MCT detector.

Image of FIG. 3.
FIG. 3.

Illustration of resonant photothermal heating. Letters “RDX” and “TNT” were written on a polypropylene film using solution of the explosives. (a) Result of nonselective heating using a heat gun. (b) IR spectrum of RDX and TNT showing resonances. (c) Laser heating with off-resonance wavelength. (d) Laser heating on resonance with TNT only. (e) Laser heating on resonance with RDX and TNT. (f) Laser heating on resonance with RDX only.

Image of FIG. 4.
FIG. 4.

(a) Raw thermal image of TNT particles on a stainless steel substrate. (b) Differential image (laser on minus laser off). Individual particles of sizes diameter can be observed (1 m stand off, 20 mW, , 10 mm spot).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stand-off detection of trace explosives via resonant infrared photothermal imaging