Detection and identification of illicit drugs using terahertz imaging

被引：0
|
作者：
Lu, Meihong [1 ,3 ]
Shen, Jingling [1 ]
Li, Ning [1 ]
Zhang, Yan [1 ]
Zhang, Cunlin [1 ]
Liang, Laishun [2 ]
Xu, Xiaoyu [2 ]
机构：
[1] Department of Physics, Capital Normal University, Beijing 100037, China
[2] First Research Institute, Ministry of Public Security of China, Beijing 100044, China
[3] Changzhi College, Changzhi City of Shanxi Prov. 046011
来源：
Journal of Applied Physics | 2006年 / 100卷 / 10期
关键词：
We demonstrated an advanced terahertz imaging technique for detection and identification of illicit drugs by introducing the component spatial pattern analysis. As an explanation, the characteristic fingerprint spectra and refractive index of ketamine were first measured with terahertz time-domain spectroscopy both in the air and nitrogen. The results obtained in the ambient air indicated that some absorption peaks are not obvious or probably not dependable. It is necessary and important to present a more practical technique for the detection. The spatial distributions of several illicit drugs [3,4-methylenedioxymethamphetamine, methylenedioxyamphetamine, heroin, acetylcodeine, morphine, and ketamine], widely consumed in the world, were obtained from terahertz images using absorption spectra previously measured in the range from 0.2 to 2.6 THz in the ambient air. The different kinds of pure illicit drugs hidden in mail envelopes were inspected and identified. It could be an effective method in the field of safety inspection. © 2006 American Institute of Physics;
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