Standoff Detection of Hazardous Molecules for Defense Applications

Deepak Kumar, Subodh Kumar, Saurabh Gupta, H. B. Srivastava, Ramesh C. Sharma
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Abstract

The paper is focused on the development of measurement technique and processing of signal for the detection of chemical, explosive, biological agents and its simulants using Engineered Quartz Enhanced Laser Photoacoustic Spectroscopy (QE-LPAS) technique. Hazardous materials like Sarin, TATP (Tri acetone tri-peroxide) and their simulants like DMMP (Dimethyl Methyl Phosphonate), Acetone, and atmospheric species were detected at 7 to 11 μm wavelength band. QE PAS technique is developed and demonstrated from a standoff distance of up to 30 meters in gaseous/vapourous and aerosols based on retro-reflector in ~2.0 ppm concentration. Hazardous biomolecules like Tryphatophan and DPA were detected on diffused aluminum adsorbed surface plate. Explosive and its simulants, TNT on adsorbed surface and DMMP, Nitrobenzene, Acetone were detected in vapour/aerosol form. A dedicated single screen, single user, user friendly Graphical User Interface (GUI) for controlling the entire system, acquisition and processing of the incoming signal and demonstration of results has been developed with the help of Laboratory Virtual Instrument Engineering Workbench (LABVIEW).
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用于国防应用的危险分子的对峙检测
本文主要研究了工程石英增强激光光声光谱(QE-LPAS)技术在化学、爆炸、生物制剂及其模拟物检测中的测量技术和信号处理的发展。在7 ~ 11 μm波段检测到沙林、三丙酮三过氧化物(TATP)及其模拟物DMMP、丙酮和大气物质等有害物质。在~2.0 ppm浓度的气体/蒸气和气溶胶中,基于反向反射器,开发并演示了QE PAS技术,距离可达30米。在扩散型铝吸附板上检测了色氨酸、DPA等有害生物分子。以蒸汽/气溶胶形式检测炸药及其模拟物、吸附表面的TNT和DMMP、硝基苯、丙酮。在实验室虚拟仪器工程工作台(LABVIEW)的帮助下,开发了一个专用的单屏、单用户、用户友好的图形用户界面(GUI),用于控制整个系统、采集和处理输入信号以及显示结果。
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