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Standoff Laser-Induced Thermal Emission of Explosives

机译：支座激光诱导炸药的热发射

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摘要

A laser mediated methodology for remote thermal excitation of analytes followed by standoff IR detection is proposed. The goal of this study was to determine the feasibility of using laser induced thermal emission (LITE) from vibrationally excited explosives residues deposited on surfaces to detect explosives remotely. Telescope based FT-IR spectral measurements were carried out to examine substrates containing trace amounts of threat compounds used in explosive devices. The highly energetic materials (HEM) used were PETN, TATP, RDX, TNT, DNT and ammonium nitrate with concentrations from 5 to 200 μg/cm~2. Target substrates of various thicknesses were remotely heated using a high power CO_2 laser, and their mid-infrared (MIR) thermally stimulated emission spectra were recorded. The telescope was configured from reflective optical elements in order to minimize emission losses in the MIR frequencies and to provide optimum overall performance. Spectral replicas were acquired at a distance of 4 m with an FT-IR interferometer at 4 cm~(-1) resolution and 10 scans. Laser power was varied from 4-36 W at radiation exposure times of 10, 20, 30 and 60 s. CO_2 laser powers were adjusted to improve the detection and identification of the HEM samples. The advantages of increasing the thermal emission were easily observed in the results. Signal intensities were proportional to the thickness of the coated surface (a function of the surface concentration), as well as the laser power and laser exposure time. For samples of RDX and PETN, varying the power and time of induction of the laser, the calculated low limit of detections were 2 and 1 μg/cm~2, respectively.
机译：提出了一种激光介导的方法，用于对分析物进行远距离热激发，然后进行隔离红外检测。这项研究的目的是确定使用沉积在表面上的振动激发炸药残余物的激光诱导热发射（LITE）来远程检测炸药的可行性。进行了基于望远镜的FT-IR光谱测量，以检查含有爆炸装置中使用的痕量威胁化合物的基质。所使用的高能材料（HEM）是PETN，TATP，RDX，TNT，DNT和硝酸铵，其浓度为5至200μg/ cm〜2。使用高功率CO_2激光远程加热各种厚度的目标基板，并记录其中红外（MIR）热激发的发射光谱。望远镜由反射光学元件构成，以使MIR频率中的发射损耗最小，并提供最佳的整体性能。使用FT-IR干涉仪以4 cm〜（-1）的分辨率和10次扫描在4 m的距离处获取光谱副本。在10、20、30和60 s的辐射暴露时间下，激光功率从4-36 W变化。调整CO_2激光功率以改善对HEM样品的检测和鉴定。在结果中容易观察到增加散热的优点。信号强度与涂层表面的厚度（表面浓度的函数）以及激光功率和激光曝光时间成正比。对于RDX和PETN样品，改变激光的激发功率和时间，计算出的检测下限分别为2和1μg/ cm〜2。

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  • 来源
    《Thermonsense: thermal infrared applications XXXV》|2013年|870508.1-870508.10|共10页
  • 会议地点 Baltimore MD(CN)
  • 作者

    Nataly Y. Galan-Freyle; Leonardo C. Pacheco-Londono; Amanda Figueroa-Navedo; Samuel P. Hernandez-Rivera;

  • 作者单位

    ALERT DHS Center of Excellence for Explosives Research Chemical Sensors Development/Chemical Imaging Center Department of Chemistry, University of Puerto Rico, Mayagueez, PR;

    ALERT DHS Center of Excellence for Explosives Research Chemical Sensors Development/Chemical Imaging Center Department of Chemistry, University of Puerto Rico, Mayagueez, PR;

    ALERT DHS Center of Excellence for Explosives Research Chemical Sensors Development/Chemical Imaging Center Department of Chemistry, University of Puerto Rico, Mayagueez, PR;

    ALERT DHS Center of Excellence for Explosives Research Chemical Sensors Development/Chemical Imaging Center Department of Chemistry, University of Puerto Rico, Mayagueez, PR;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LITE; highly energetic materials (HEM); MIR emission spectroscopy; CO_2 laser;

    机译：精简版;高能材料（HEM）； MIR发射光谱； CO_2激光;

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