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Noninvasive Mail Inspection System with Terahertz Radiation

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Abstract:

Using the high penetrability of the terahertz waves and the characteristic absorption spectra in this frequency range, we have built a noninvasive 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.

Keywords: DRUG ANALYSIS; EXPLOSIVES ANALYSIS; FINGERPRINT SPECTRUM; MAIL; SPECTROSCOPY; TERAHERTZ WAVE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209787169713

Affiliations: RIKEN, 519-1399 Aramaki-Aoba, Aoba-ku, Sendai, Miyagi, 980-0845, Japan; Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan

Publication date: January 1, 2009

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