基于太赫兹时域谱分析的爆炸物检测方法研究

Study on the method of explosives detection based on terahertz time-domain spectroscopy

采用太赫兹时域谱分析技术测量了在氮气和空气环境下四种典型爆炸物的太赫兹光谱,并分别利用均值平滑、傅里叶低通滤波以及小波分解与重构三种方法来消除空气中由水蒸气吸收引起的光谱振荡现象。实验结果表明:四种爆炸物的太赫兹光谱具有可分辨的特征,能够作为识别的依据;通过研究水蒸气的影响,使得利用太赫兹时域谱分析技术检测爆炸物向实用化迈进了一步。

Terahertz spectra of four kinds of representative explosives are measured by terahertz time-domain spectroscopy in both nitrogen and air environment. Using the methods of average smoothing, Fourier low-pass filtering and wavelet decomposition and reconstruction, the oscillations on the spectra caused by the water vapor absorption are removed. The experimental results indicate that the terahertz spectra of the explosive materials have distinct features, which can be used as the standards for recognition, and the study of eliminating the influence of water vapor makes the technique of detecting explosives by terahertz time-domain spectroscopy take a step toward practicality.