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Mail Inspection Based on Terahertz Time-Domain Spectroscopy

: Molter, Daniel; Hübsch, Daniel; Sprenger, Thorsten; Hens, Korbinian; Nalpantidis, Konstantinos; Platte, Frank; Torosyan, Garik; Beigang, Rene; Jonuscheit, Joachim; Freymann, Georg von; Ellrich, Frank

Fulltext ()

Applied Sciences 11 (2021), No.3, Art. 950, 14 pp.
ISSN: 2076-3417
Journal Article, Electronic Publication
Fraunhofer ITWM ()
terahertz time-domain spectroscopy; mail inspection; spectroscopy; public security; pattern recognition; explosives; drug

One of the most prominent applications of terahertz time-domain spectroscopy is the spectral investigation of materials covered by visibly opaque objects. Therefore, terahertz waves are well suited to inspect the content of mail. We report on our work on mail inspection in this spectral range including machine design, optical layouts, data analysis, and implementations.