30 April 2009 Non-invasive mail inspection system with terahertz radiation
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Using the high penetrability of the terahertz waves and the characteristic absorption spectra in this frequency range, we built a non-invasive mail inspection system targeting drugs and explosives. The system is composed of two stages; in the first stage, the scattering of a continuous terahertz wave is used for selecting mail that contains concealed powder; in the second stage, the absorption spectrum of the suspicious mail is measured and the material is identified using a terahertz spectrum database. We evaluated the performance and the limits of the inspection system.
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Hiromichi Hoshina, Yoshiaki Sasaki, Aya Hayashi, Chiko Otani, Kodo Kawase, "Non-invasive mail inspection system with terahertz radiation", Proc. SPIE 7311, Terahertz Physics, Devices, and Systems III: Advanced Applications in Industry and Defense, 731103 (30 April 2009); doi: 10.1117/12.819306; https://doi.org/10.1117/12.819306

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