Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 41, Issue 13, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/41/13/135306
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Absorption spectra of six illicit drugs were measured by using the terahertz time-domain spectroscopy technique in the range 0.2-2.6 THz and then clustered with self-organization feature map (SOM) artificial neural network. After the network training process, the spectra collected at another time were identified successfully by the well-trained SOM network. An effective distance was introduced as a quantitative criterion to decide which cluster the new spectra were affiliated with.
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