太赫兹时域光谱技术在危险品检测方面的应用

太赫兹波(terahertz, THz, T-ray)是指频率介于0.1～10 THz之间的电磁辐射，在电磁波谱上位于微波和远红外线之间。大多数爆炸物、毒品在此波段有特征吸收。与在公共安全领域检测武器、爆炸物、毒品等危险品的传统方法相比，太赫兹辐射能量低，不会产生电离辐射，也不会引起安全担忧。而且，太赫兹波对于衣物等大多数包装材料有很强的穿透力，对物质的检测可以做到高灵敏、无损伤和远距离，因此在反恐、毒品、安全检测等方面具有显著潜在优势。文章介绍了国内外太赫兹时域光谱技术(terahertz time domain spectroscopy, THz-TDS)在爆炸物及毒品检测方面的研究最新进展；详细讨论了黑索金(RDX)的研究现状，并初步探讨了影响实验结果的几种因素。

Application of Terahertz Time Domain Spectroscopy to Explosive and Illegal Drug

Terahertz waves(THz,T-ray) lie between far-infrared and microwave in electromagnetic spectrum with frequency from 0.1 to 10 THz.Many explosives and illicit drugs show characteristic spectral features in the terahertz.Compared with conventional methods of detecting a variety of threats,such as weapons,explosives and illegal drugs,THz radiation is low frequency and non-ionizing,and does not give rise to safety concerns.Moreover,THz can penetrate many barrier materials,such as clothing and common packaging materials.THz technique has a great potential and advantage in antiterrorism and security inspection of explosives and illegal drugs due to the ability of high-sensitivity,nondestructive and stand-off inspection of many substances.The present paper summarizes the latest progress in the application of terahertz time domain spectroscopy(THz-TDS) to explosives and illegal drugs.Studies on RDX are discussed in details and many factors affecting experiments are also introduced.