Ultrasonic photoacoustic spectroscopy of trace hazardous chemicals using quantum cascade laser

被引：9
作者：
Kumar, Deepak [1 ]
Ghai, Devinder Pal [1 ]
Soni, R. K. [2 ]
机构：
[1] DRDO, Laser Sci & Technol Ctr, Delhi 110054, India
[2] Indian Inst Technol Delhi, Dept Phys, Hauz Khas, New Delhi 110016, India
来源：
OPTICS COMMUNICATIONS | 2016年 / 381卷
关键词：
Photoacoustic; Chemicals; Quantum Cascade laser; Laser Spectroscopy; EXPLOSIVES; SPECTRA; SOLIDS;
D O I：
10.1016/j.optcom.2016.07.017
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report an ultrasonic sensor based on open-cell photoacoustic spectroscopy method for the detection of explosive agents in traces. Experimentally, we recorded photoacoustic spectra of traces of hazardous explosives and molecules. Tunable mid-infrared quantum cascade lasers in the wavelength range 7.0-8.8 mu m lying in the molecular fingerprint region are used as optical source. Samples of Pentaerylthirol Tetranitrate (PETN), Tetranitro-triazacyclohexane (RDX), Dinitrotoluene, p-Nitrobenzoic acid and other chemicals like Ibuprofen having quantity similar to 1.0 mg were detected using a custom made photoacoustic cells in both open and closed configurations. The explosive traces were swiped using paper from contaminated surface and detected. Finite element mesh based simulation of photoacoustic cell is carried out for optimization of geometry at ultrasonic frequency (40 kHz). A point sensor based on above approach will be very effective for forensic applications and suspicious material screening. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：271 / 276
页数：6
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