Terahertz Spectroscopic Imaging and Its Application to Drug Detection

Kodo KAWASE  Yuichi OGAWA  Yuuki WATANABE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.7   pp.1186-1191
Publication Date: 2004/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Ultrafast Photonics)
Category: 
Keyword: 
terahertz,  imaging,  spectroscopy,  chemical,  component pattern analysis,  drug detection,  

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Summary: 
We have developed a novel basic technology for terahertz (THz) imaging, which allows detection and identification of chemicals by introducing the component spatial pattern analysis. The spatial distributions of the chemicals were obtained from terahertz multispectral transillumination images, using absorption spectra previously measured with a widely tunable THz-wave parametric oscillator. We have also separated the component spatial patterns of frequency-dependent absorptions in chemicals and frequency-independent components such as plastic, paper and measurement noise in THz spectroscopic images. Further we have applied this technique to the detection and identification of illicit drugs concealed in envelopes.