27 October 2006 Non-destructive inspections of illicit drugs in envelope using terahertz time-domain spectroscopy
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Proceedings Volume 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine; 60472Y (2006) https://doi.org/10.1117/12.710671
Event: Fourth International Conference on Photonics and Imaging in Biology and Medicine, 2005, Tianjin, China
Abstract
The absorption spectra of two illicit drugs, methylenedioxyamphetarnine (MDA) and methamphetamine (MA), within and without two conventional envelopes are studied using terahertz time-domain spectroscopy technique. The characteristic absorption spectra of MDA and MA are obtained in the range of 0.2 THz to 2.5 THz. MDA has an obvious absorption peak at 1.41 THz while MA has obvious absorption peaks at 1.23 THz, 1.67 THz, 1.84 THz and 2.43 THz. We find that the absorption peaks of MDA and MA within the envelopes are almost the same as those without the envelopes respectively although the two envelopes have some different absorption in THz waveband. This result indicates that the type of illicit drugs in envelopes can be determined by identifying their characteristic absorption peaks, and THz time-domain spectroscopy is one of the most powerful candidates for illicit drugs inspection.
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Ning Li, Ning Li, Jingling Shen, Jingling Shen, Meihong Lu, Meihong Lu, Yan Jia, Yan Jia, Jinhai Sun, Jinhai Sun, Laishun Liang, Laishun Liang, Yanning Shi, Yanning Shi, Xiaoyu Xu, Xiaoyu Xu, Cunlin Zhang, Cunlin Zhang, } "Non-destructive inspections of illicit drugs in envelope using terahertz time-domain spectroscopy", Proc. SPIE 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine, 60472Y (27 October 2006); doi: 10.1117/12.710671; https://doi.org/10.1117/12.710671
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