摘要:
概述了利用光整流、光电导天线、参量振荡、空气等离子体等方式产生太赫兹(THz)波,以及利用电光取样、光电导天线、空气等离子体等探测THz波的方法。阐述了THz时域光谱技术以及近年来发展的异步电光取样技术。讨论了THz技术在各领域的应用。重点介绍了本课题组近年来致力于THz检测技术在毒品检测识别方面的研究情况。建立了含有38种纯度在90%以上的THz毒品谱库,并采用人工神经网络、支持向量机等方法对毒品进行计算机自动识别,研究确定了毒品纯度和有效成分含量的理论和实验方法。用高斯软件对个别品种,如甲基苯丙氨(MA)、氯氨酮、海洛因进行了光谱解析,研究结果为实现毒品的实验室检测提供了依据。最后,简单综述了THz技术的发展前景。
Abstract:
The methods to generate the terahertz wave by optical rectification, photoconductive antennas, air plasmas and parametric generators are described in detail, then how to detect the terahertz wave by electro-optic sampling, photoconductive antennas and air plasmas are introduced as well. The terahertz time-domain spectroscopy and the asynchronous electro-optic sampling technique are also described. Furthermore, the applications of the terahertz technology to research fields, especially to the detection and identification of drugs are discussed. A terahertz spectrum database includes 38 kinds of drugs with a purity more than 99% is established. Moreover, the Artificial Neural Network(ANN) and a support vector machine are used to identify drugs automatically and the experimental methods and related theory are proposed to determine the purity and effective ingredients of drugs. By using a Gaussian software, individual species of drugs such as methyl-phenyl ammonia(MA), ketamine and heroin are conducted by spectral analysis, which provides a basis for implementing the drug inspection in laboratories. Finally, this paper reviews the developments of the terahertz technology briefly.
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