Journal
OPTICS COMMUNICATIONS
Volume 309, Issue -, Pages 44-49Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2013.06.025
Keywords
Photo-acoustic spectroscopy; Standoff detection; Explosive materials; Hazardous chemicals; Quantum cascade laser
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Standoff Quartz Enhanced Laser Photoacoustic Spectroscopy (QE-LPAS) technique is emerging as a powerful technique for detection of hazardous chemicals, biological and explosive agents. Experimentally, we have recorded standoff photoacoustic spectrum of hazardous molecules adsorbed at diffused surfaces from a distance of up to 25 m. Tunable mid infrared quantum cascade lasers (MIR-QCL) in the wavelength range 7.0-12.0 mu m are being used as optical source. Samples of Dinitrotoluene (DNT), Pentaerythritoltetranitrate (PETN) having adsorbed concentration of approximately 5.0 mu g/cm(2) were detected. Acetone and nitrobenzene samples in liquid having concentration 200 nl approximately sealed in polythene sachet were detected from a standoff distance of up to 25 m. All the above measurements are reported for a Signal to Noise Ratio (SNR) of 10, optimized for maintaining very less false alarm rates for field measurements. A portable trolley mounted system has been developed for field applications. (C) 2013 Elsevier B.V. All rights reserved.
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