Non-invasive Mail Inspection System with Terahertz Radiation
2009
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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