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Terahertz wave reference-free phase imaging for identification of explosives
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View: Figures


Image of FIG. 1.
FIG. 1.

The absorbance spectra calculated by using a reference signal (solid curve) and the reference-free phase spectra (dotted curve) of (a) HMX, (b) RDX, and (c) 2,4-DNT. In (a), the dashed line represents the HMX absorption peak around . In (b), the dashed lines indicate the RDX absorption peaks around 0.82, 1.06, and . In (c), the dashed lines display the absorption peaks of 2,4-DNT around 0.66, 1.08, and .

Image of FIG. 2.
FIG. 2.

The dashed lines indicate the spectral positions of tabulated water vapor absorption peaks centered at 0.56, 0.69, 0.78, 0.99, 1.12, 1.21, 1.32, 1.43, 1.55, 1.70, and . The arrows show the absorption peaks of HMX, RDX, and 2,4-DNT. Only the peaks at for HMX, for RDX, and for 2,4-DNT can be still seen in the humid environment.

Image of FIG. 3.
FIG. 3.

(a) The schematic illustration of the four imaging samples and the images of the sample targets formed by integrating the peak area around (b) 1.80, (c) 0.82, and (d) , with a width of . All the three explosive material samples can be identified at the images of their corresponding absorption peak frequencies.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz wave reference-free phase imaging for identification of explosives