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Stand-off detection of explosives particles by multispectral imaging Raman spectroscopy

机译：多光谱成像拉曼光谱对爆炸物颗粒的定位检测

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摘要

A Raman multispectral imaging technique is presented, which can be used for stand-off detection of single explosives particles. A frequency-doubled Nd:YAG laser operating at 10 Hz illuminates the surface under investigation. The backscattered Raman signal is collected by a receiver subsystem consisting of a 150 mm Schmidt-Cassegrain telescope, a laser line edge filter, a liquid-crystal tunable filter, and a gated intensified charge-coupled device (ICCD) detector. A sequence of images is recorded by the ICCD, where, for each recording, a different wavelength is selected by the tunable filter. By this, a Raman spectrum is recorded for each pixel, which makes it possible to detect even single particles when compared to known spectra for possible explosives. The comparison is made using correlation and least-square fitting. The system is relatively insensitive to environment and light variations. Multispectral Raman images of sulfur, ammonium nitrate, 2,4-dinitrotoluene, and 2,4,6-trinitrotoluene were acquired at a stand-off distance of 10 m. Detection of sulfur particles was done at a distance of 10 m.
机译：提出了一种拉曼多光谱成像技术，该技术可用于对单个炸药颗粒进行相距检测。工作在10 Hz的Nd：YAG倍频激光照亮了正在研究的表面。反向散射拉曼信号由一个接收器子系统收集，该子系统包括一个150毫米的施密特-卡塞格林望远镜，一个激光线边缘滤波器，一个液晶可调滤波器和一个门控增强型电荷耦合器件（ICCD）检测器。图像序列由ICCD记录，其中对于每次记录，可调滤波器选择不同的波长。这样，记录了每个像素的拉曼光谱，与已知的爆炸物光谱相比，甚至可以检测单个颗粒。使用相关和最小二乘拟合进行比较。该系统对环境和光线变化相对不敏感。硫，硝酸铵，2,4-二硝基甲苯和2,4,6-三硝基甲苯的多光谱拉曼图像是在10 m的固定距离处获得的。硫颗粒的检测距离为10 m。

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