Photoacoustic sensor for trace detection of post-blast explosive and hazardous molecules

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

doi:10.1016/j.snb.2016.11.133

Cited by 19 publications

(8 citation statements)

References 10 publications

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“…The first two peaks are due to the presence of PETN in the mixture and the last peak is attributed to the presence of DNT molecules. DNT which is basically a precursor of TNT shows a very strong peak at 1352 cm -1 due to -NO 2 symmetric stretching and matches well with Fourier transform infrared (FTIR) spectra 7,8 . Strong overlapping peaks at 1272 cm -1 (-NO 2 Stretching) and 1284 cm -1 (-CH 2 bending) are clearly resolved and belong to PETN 9, 10 .…”

Section: Resultssupporting

confidence: 70%

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: Resultssupporting

confidence: 70%

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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“…Plain uncoated filter papers were used as control samples, since paper is a commonly used swabbing material due to its fibrous structure. 26 Sensor films were based on the polymer Merck Super Yellow, which is a commercially-available conjugated polymer that has been shown recently to be an effective sensor of explosives including 2,4-DNT and TNT. 19,27,28 Super Yellow was dissolved in toluene at a concentration of 6.5 mg ml −1 .…”

Section: Swab and Polymer Sensor Preparationmentioning

confidence: 99%

Explosives detection by swabbing for improvised explosive devices

Glackin

Gillanders

Eriksson

et al. 2020

Analyst

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“…The exposed uncoated filter paper gives a quenching response of around 27%, which suggests the rough, fibrous structure of the paper is able to trap some explosive molecules and desorb via heating. Plain paper has been recently shown to successfully adsorb explosive particles for photoacoustic sensing (Sharma et al, 2017). However, a clear quenching response of over 70% is shown by the Aflas-spotted filter paper exposed to 2,4-DNT vapour.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Preconcentration techniques for trace explosive sensing

Gillanders

Glackin

Filipi

et al. 2019

Science of The Total Environment

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Trace sensing of explosive vapours is a method in humanitarian demining and Improvised Explosives Device (IED) detection that has received increasing attention recently, since accurate, fast, and reliable chemical detection is highly important for threat identification.However, trace molecule sampling in the field can be extremely difficult due to factors including weather, locale, and very low vapour pressure of the explosive. Preconcentration of target molecules onto a substrate can provide a method to collect higher amounts of analyte for analysis. We used the commercial fluoropolymer Aflas as a preconcentrator material to sorb explosive molecules to the surface, allowing subsequent detection of the explosives via the luminescence quenching response from the organic polymer Super ACCEPTED MANUSCRIPTHighlights  Trace detection of explosive vapours is challenging in real-world environments. By "preconcentrating" trace vapours onto solid substrates, higher amounts can be collected for detection. Our approach combines fluoropolymer preconcentrators, free-flying honeybees for sampling, and luminescent thin films as the sensing mechanism. The inexpensive, commercially-available fluoropolymer Aflas has shown good preconcentration abilities for 2,4-DNT which is typically found in landmines. Laboratory results and initial field results indicate this method is a very promising tool for the detection of trace explosive vapours in contaminated land.

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Photoacoustic sensor for trace detection of post-blast explosive and hazardous molecules

Cited by 19 publications

References 10 publications

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

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

Explosives detection by swabbing for improvised explosive devices

Preconcentration techniques for trace explosive sensing

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