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首页> 外文会议>Infrared Technology and Applications XXXIII pt.2; Proceedings of SPIE-The International Society for Optical Engineering; vol.6542 pt.2 >Detection of 2,4,6-trinitrotoluene on Non Traditional Surfaces using Fiber Optic Coupled Grazing Angle Probe- FTIR
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Detection of 2,4,6-trinitrotoluene on Non Traditional Surfaces using Fiber Optic Coupled Grazing Angle Probe- FTIR

机译：光纤耦合掠角探针-FTIR检测非传统表面上的2,4,6-三硝基甲苯

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With heightened awareness of Homeland Security issues, the detection of explosive has become a pressing priority. Explosives detection is a very important task for National Security: threat compounds need to be detected on a variety of surfaces. Every surface will interact with the target compounds in a very unique manner and the degree of adhesion will vary from surface to surface. The formidable task includes development of new probes and methods for detection of concealed explosives. Fiber Optic Coupled Infrared Spectroscopy has been used as a potential technique to develop new methodologies for detection of explosives on surfaces. On one of such proposed methodologies involves a Grazing Angle Probe rendering the latter as a remote sensed, in situ and capability of detecting nanograms/cm~2 of the compounds. In this research a smearing technique was used for transferring the target analytes onto the substrates to be used as standards. Smearing was also used as a sample transfer method of the threat agents to target surfaces. One of the most relevant areas of investigation is to analyze 2,4,6-trinitrotoluene (TNT) on various non traditional surfaces such as plastics. The work also centered in to obtaining an optimization method where a more accurate spectrum could be obtained and a better spectroscopic preprocessing routine could be applied. A series of statistical methods can be used for quantification of TNT on plastic surfaces, among these are: peak height analysis and peak areas integration. Both of these can be coupled to Partial least squares regression, which is an extension of multiple linear regression models. Using peak areas in the range from 1380 to 1273 cm~(-1), the method was found to be linear for loading concentration lower than 5.0 μg/cm~2. A loading concentration of 0.62 μg/cm~2 (620 ng/cm~2) was considered as limit of quantification and 0.16 μg/cm~2(160 ng/cm~2) as limit of detection.
机译：随着对国土安全问题的认识不断提高，爆炸物的检测已成为当务之急。爆炸物检测对国家安全是非常重要的任务：威胁化合物需要在各种表面上进行检测。每个表面都将以非常独特的方式与目标化合物相互作用，并且粘附程度会因表面而异。艰巨的任务包括开发新的探针和用于探测隐藏爆炸物的方法。光纤耦合红外光谱已被用作开发检测表面爆炸物的新方法的潜在技术。在这种提出的方​​法中的一种涉及放牧角度探针，其使后者成为遥感的，原位的并且具有检测纳克/ cm 2化合物的能力。在这项研究中，采用涂片技术将目标分析物转移到要用作标准品的基质上。涂抹也被用作威胁剂到目标表面的样品转移方法。最相关的研究领域之一是分析各种非传统表面（例如塑料）上的2,4,6-三硝基甲苯（TNT）。这项工作还集中在获得一种优化方法上，在该方法中可以获得更准确的光谱并可以应用更好的光谱预处理程序。一系列统计方法可用于定量塑料表面上的TNT，其中包括：峰高分析和峰面积积分。这两种方法都可以与偏最小二乘回归结合，后者是多个线性回归模型的扩展。使用1380至1273 cm〜（-1）范围内的峰面积，发现该方法对于负载浓度低于5.0μg/ cm〜2呈线性。定量极限为0.62μg/ cm〜2（620 ng / cm〜2），检测极限为0.16μg/ cm〜2（160 ng / cm〜2）。

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