Detection of Ultrasonic Waves Using Resonant Cylindrical Cavity for Defense Application

Sharma, Ramesh C.; Kumar, Subodh; Gautam, Surya Kumar; Gupta, Saurabh; Kumar, Deepak; Srivastava, Hari Babu

doi:10.1109/jsen.2017.2655086

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…Figure 2 shows the hardware of the experimental setup. Most of the equipment used in the present work were utilised in our previous work where a cylindrical resonant cavity was used to enhance the photoacoustic signal 13 . In the experimentations done for the present study, the microphone was placed at the focal point of a 12 cm diameter parabolic acoustic reflector.…”

Section: Methodsmentioning

confidence: 99%

Ultrasonic Standoff Photoacoustic Sensor for the Detection of Explosive and Hazardous Molecules

Sharma¹,

Kumar²,

Gupta³

et al. 2018

Def. Sc. Jl.

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<p>Standoff photoacoustic spectroscopic technique has been studied for the detection of hazardous molecules adsorbed on surfaces and in vapour/aerosols form in open air. Detection and identification of components in explosive mixtures in trace amounts is very challenging by any point or standoff spectroscopic detection technique. Discusses detection and identification of such components using standoff laser photoacoustic spectroscopic technique. Laser photoacoustic spectra of various trace molecules in the mid-infrared spectral band 7 μm - 9 μm have been recorded in vapor, aerosol, liquid forms as well as samples adsorbed on surfaces such as plastic and cloth. Pulsed quantum cascade laser is modulated at a frequency of 42 kHz resonant with that of microphone. Hazardous chemicals/explosives adsorbed on plastic and cloths surfaces were detected from a standoff distance up to 1.5 m. The sensitivities were found to be 20 μg/cm2, 20 μl liquid and 1.0 ppm corresponding to solid, liquid and vapour phases respectively. The chemicals/explosives used in the study were PETN, DNT, Acetone, and DMMP. Our study suggests that the photoacoustic technique has high selectivity and sensitivity for the trace detection and be used for screening of suspicious objects for security applications as a handy product.</p>

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Section: Methodsmentioning

confidence: 99%

Ultrasonic Standoff Photoacoustic Sensor for the Detection of Explosive and Hazardous Molecules

Sharma¹,

Kumar²,

Gupta³

et al. 2018

Def. Sc. Jl.

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“…Quartz-enhanced laser photoacoustic spectroscopy (QE-LPAS) technology is fast evolving as a potential tool for standoff detection of terror threats [4][5][6][7][8][9] . The photoacoustic methodology, in general, using mid-IR wavelength and microphone detector has been discussed by many researchers [10][11][12][13][14][15][16] . Zrimsek et al have demonstrated standoff photoacoustic spectroscopy of trace explosives from a meter distance using a sensitive microphone and 213 nm laser 17 .…”

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confidence: 99%

Standoff pump-probe photothermal detection of hazardous chemicals

Sharma

Kumar

Parmar

et al. 2020

Sci Rep

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A novel pump-probe Photothermal methodology using Quartz Tuning Fork (QTF) detector has been demonstrated for the first time. A tunable mid-IR Quantum Cascade Laser (QCL) and a CW fixed wavelength visible laser have been used as the pump and probe beam respectively. The developed Photothermal (PT) technique is based on Quartz Tuning Fork (QTF) detector for the detection of hazardous/explosive molecules adsorbed on plastic surface and also in aerosols form. PT spectra of various trace molecules in the fingerprinting mid- infrared spectral band 7–9 µm from distance of 25 m have been recorded. The PT spectra of explosives RDX, TNT and Acetone have been recorded at very low quantities. Acetone is the precursor of explosive Tri-Acetone Tri-Phosphate (TATP). The experimentations using pump and probe lasers, exhibit detection sensitivity of less than 5 μg/cm2 for RDX, TNT powders and of ~ 200 nl quantity for Nitrobenzene (NB) and Acetone (in liquid form) adsorbed on surfaces, from a distance of ~ 25 m. The sensitivity of the same order achieved from a distance of 15 m by using only a mid-IR tunable pump laser coupled to QTF detector. Thus the pump-probe PT technique is more sensitive in comparison to single tunable QCL pump beam technique and it is better suited for standoff detection of hazardous chemicals for homeland security as well as for forensic applications.

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