基于小波变换的爆炸物太赫兹光谱降噪分析

Denoising Analysis of Terahertz Spectra of Explosives Based on Wavelet Transform

采用太赫兹时域光谱技术(terahertz time-domain spectroscopy,THz-TDS)对钝感RDX(黑索金)和HMX(奥克托金)炸药在0～2.5 THz频段的太赫兹吸收光谱进行了探测。得到了待测样品的太赫兹吸收光谱,确定了其特征吸收峰的位置,与其他研究机构所测吸收谱进行了对比分析。结果表明,利用太赫兹时域光谱技术在空气环境下测量样品时,样品的太赫兹光谱会因空气中水蒸气的影响而出现振荡现象。并通过小波变换对空气环境中测试的数据进行了处理,消除了太赫兹光谱中水蒸气吸收造成的影响,表明了该方法的可行性。

The terahertz absorption spectra of the insensitive explosives RDX and HMX in the spectral range from 0 to 2.5 THz are detected with terahertz time-domain spectroscopy.The terahertz absorption spectra and the characteristic absorption peak of test samples are obtained,and comparing with the absorption spectra measured by other research institutions.The results show that the absorption spectra measured in air environment have strong oscillation due to the absorption of water vapor.So the data measured in the air environment are processed with the wavelet transform to eliminate the influence of water vapor,and this method is feasible.