激光诱导击穿光谱与拉曼光谱技术在危险物检测中的研究进展

发布时间：2018-02-15 08:04

本文关键词： 激光诱导击穿光谱拉曼光谱危险物检测炸药生化危险物　出处：《光谱学与光谱分析》2017年08期 　论文类型：期刊论文

【摘要】：炸药、生物及化学危险物检测在反恐和公共安全领域具有重要应用价值,也是目前亟需解决的问题。激光诱导击穿光谱技术利用高能激光脉冲诱导材料产生等离子体,通过探测等离子体辐射光谱从而分析其组成成分。拉曼光谱技术是基于非弹性光散射的一种光谱检测方法,可以反映分子的振动信息。由于它们都具有快速和非接触遥测的优点,成为最有发展潜力和应用前景的危险物检测技术。介绍了激光诱导击穿光谱、拉曼光谱以及二者联合探测技术在危险物检测中的国内外发展现状,并对各自的优缺点进行了分析。激光诱导击穿光谱信号强、实时性好,但重复性差、基底效应影响显著,在判别组成元素相同而分子结构不同的危险物和干扰物时面临巨大挑战。拉曼光谱能够提供被测物的分子信息,适合于鉴别有机危险物,但信号弱、受荧光干扰大、检测低浓度样品及分析混合物的能力弱,外场使用时受周围杂散光以及环境变化的影响大。将这两种光谱探测技术相融合,发挥各自的优点,可以有效地提高探测危险物的准确度。但两种光谱联合探测系统结构和数据处理复杂,成本高,还有许多技术难点亟需解决。文章最后,对危险物激光诱导击穿光谱和拉曼光谱研究的前景进行了展望。
[Abstract]:The detection of explosives, biological and chemical hazards has important application value in the field of anti-terrorism and public safety, and is also a problem that needs to be solved. Laser induced breakdown spectroscopy uses high-energy laser pulse-induced materials to produce plasma. Raman spectroscopy is a spectral detection method based on inelastic light scattering. They can reflect the vibration information of molecules. Because of their advantages of fast and non-contact telemetry, they are the most promising and promising detection techniques for hazardous substances. The laser induced breakdown spectra are introduced. The present situation of Raman spectroscopy and their combined detection technology in the detection of hazardous substances at home and abroad are analyzed. The advantages and disadvantages of the two techniques are analyzed. The laser induced breakdown spectrum signal is strong and real-time, but the repeatability is poor, and the effect of substrate effect is significant. The Raman spectrum can provide molecular information for the detection of organic hazardous substances, but the signal is weak, and it is greatly interfered by fluorescence. The ability to detect low concentration samples and analyze mixtures is weak, and the external field is greatly affected by ambient stray light and environmental changes. The two spectral detection techniques are combined to give play to their respective advantages. It can effectively improve the accuracy of detecting dangerous substances. However, the structure and data processing of the two kinds of spectral joint detection system are complex, high cost, and many technical difficulties need to be solved. The prospect of laser induced breakdown spectra and Raman spectra of hazardous substances is prospected.
【作者单位】：北京理工大学光电学院;
【基金】：国家自然科学基金项目(60978035) 北京市自然科学基金项目(4132063)资助
【分类号】：O657.3;TQ086.52

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