基于太赫兹时域光谱系统的爆炸物识别

描述了太赫兹时域光谱系统的原理和组成,研制了太赫兹时域光谱(0.1~3THz)系统。介绍了太赫兹时域光谱技术在爆炸物识别方面的优势及其特点,提出了爆炸物识别的数学模型和方法。采用太赫兹时域光谱系统测试爆炸物样品的特征吸收光谱并将其作为标准模板,然后将爆炸物置于土壤、水泥和塑料障碍物后,采用太赫兹时域光谱系统得到穿透障碍物后爆炸物的特征吸收光谱,并将其与标准模板比对,从而实现爆炸物的隔物穿透识别。实验得到爆炸物RDX的特征吸收光谱,其特征频率为0.82,1.70和2.40THz。实验还对不同厚度和种类障碍物下爆炸物RDX、CL-20、LLM-105和FOX-1进行了实验测试,结果表明:穿透障碍物后爆炸物可识别的特征吸收光谱与标准模板匹配得很好,证明根据爆炸物特征吸收光谱实现爆炸物匹配识别的方法是可行的。基于文中提出的太赫兹时域光谱系统可进一步开展爆炸物残留痕量探测识别和隔物技术研究。

Explosive identification based on terahertz time-domain spectral system

The principle and composition of terahertz time-domain spectrum systems were described, and a terahertz time-domain spectrum system ranged from 0.1 THz to 3 THz was developed. The characters and predominance of terahertz time-domain spectrum technology on explosive identification were introduced and a mathematical model and a method for the explosive identification were proposed. The terahertz time-domain spectrum system was used to test the character absorbing spectra of explosives and main absorbing spectra were regarded as standard templates. Then, four kinds explosives(RDX,CL-20,LLM-105 and FOX-1) were put behind the barriers (soil, cement and plastic),and the terahertz time-domain spectrum system was used to obtain the character absorbing spectra of explosives penetrating through the barriers. The results were compared with standard templates to implement the explosive identification. The character absorbing spectra of RDX were obtained, and their character frequencies are 0.82, 1.70 and 2.40 THz. Furthermore, these explosives were tested through different barriers with different thicknesses. The results show that character absorbing spectra of explosives penetrating through the barriers match the standard templates perfectly, which verifies that it is feasible to use the terahertz time-domain spectrum system to realize explosive identification according to character absorbing spectra. Moreover, the terahertz time-domain spectrum system can be used to identify the residual trace of explosives and explore the imaging technology for penetrating through barriers.