Portable remote Raman system for monitoring hydrocarbon, gas hydrates and explosives in the environment
Portable remote Raman system for monitoring hydrocarbon, gas hydrates and explosives in the environment
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DOI：
10.1016/j.saa.2005.02.020
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发表时间：
2005-08-01
影响因子：
4.4
通讯作者：
Sharma, B
中科院分区：
文献类型：
--
作者：
Sharma, SK;Misra, AK;Sharma, B
我们报告了我们使用小型便携式拉曼系统进行各种类型有机化学品（包括苯，甲苯，乙苯和二甲苯（BTEX））的远距离检测和鉴定的初步努力。光纤（FO）耦合和直接耦合f/2.2光谱仪与望远镜已经开发和测试。采用倍频Nd:YAG脉冲激光器（20 Hz, 532 nm， 35 mJ/脉冲）作为激发源。FO耦合拉曼系统的工作距离测试为66 m，直接耦合系统的工作距离测试为120 m。我们还测量了压缩甲烷气体和甲烷水合物的远端拉曼光谱。远程拉曼系统对识别未知化合物的有用性是通过测量两种塑性炸药，如三氨基三硝基苯（TATB）和β - hmx在10米的隔离距离的隔离光谱来证明的。远程拉曼系统将用于地面应用，如监测环境污染，在10秒或更短的时间内识别公共场所的未知物质，以及探测火星等行星表面的碳氢化合物羽流和天然气水合物。(c) 2005 Elsevier B.V.版权所有
We report our initial efforts to use a small portable Raman system for stand-off detection and identification of various types of organic chemicals including benzene, toluene, ethyl benzene and xylenes (BTEX). Both fiber-optic (FO) coupled and a directly coupled f/2.2 spectrograph with the telescope have been developed and tested. A frequency-doubled Nd:YAG pulsed laser (20 Hz, 532 nm, 35 mJ/pulse) is used as the excitation source. The operational range of the FO coupled Raman system was tested to 66 m, and the directly coupled system was tested to a distance of 120 m.We have also measured remote Raman spectra of compressed methane gas and methane gas hydrate. The usefulness of the remote Raman system for identifying unknown compounds is demonstrated by measuring stand-off spectra of two plastic explosives, e.g. tri-amino trinitrobenzene (TATB) and beta-HMX at 10 m stand-off distance. The remote Raman system will be useful for terrestrial applications such as monitoring environmental pollution, in identifying unknown materials in public places in 10 s or less, and for detecting hydrocarbon plumes and gas hydrates on planetary surfaces such as Mars. (c) 2005 Elsevier B.V. All rights reserved.