Standoff Raman Spectroscopic Detection of Explosive Molecules

Chung, J.; Cho, Soo Gyeong

doi:10.5012/bkcs.2013.34.6.1668

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…2 The standoff system was composed of five parts including reflective telescope, Nd:YAG laser, spectrometer, ICCD camera, and analyzing computer. Since Raman signal was scattered to all directions isotropically and larger scattering cross section coverage was preferred, a reflective telescope with wider diameter was adopted for design concept.…”

Section: Methodsmentioning

confidence: 99%

Nanosecond Gated Raman Spectroscopy for Standoff Detection of Hazardous Materials

Chung¹,

Cho²

2014

Bulletin of the Korean Chemical Society

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Laser Raman spectroscopy is one of the most powerful technologies for standoff detection of hazardous materials including explosives. Supported by recent development of laser and sensitive ICCD camera, the technology can identify trace amount of unknown substances in a distance. Using this concept, we built a standoff detection system, in which nanosecond pulse laser and nanosecond gating ICCD technique were delicately devised to avoid the large background noise which suppressed weak Raman signals from the target sample. In standoff detection of explosives which have large kill radius, one of the most important technical issues is the detection distance from the target. Hence, we focused to increase the detection distance up to 54 m by careful optimization of optics and laser settings. The Raman spectra of hazardous materials observed at the distance of 54 m were fully identifiable. We succeeded to detect and identify eleven hazardous materials of liquid or solid particles, which were either explosives or chemical substances used frequently in chemical plants. We also performed experiments to establish the limit of detection (LOD) of HMX at 10 m, which was estimated to be 6 mg.

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Section: Methodsmentioning

confidence: 99%

Nanosecond Gated Raman Spectroscopy for Standoff Detection of Hazardous Materials

Chung¹,

Cho²

2014

Bulletin of the Korean Chemical Society

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“…Considerable work has been done in recent years with Raman spectroscopy to improve its portability and standoff capabilities for explosive detection. For example, Chung and Cho recently developed a standoff nanosecond-gated Raman detection system composed of a reflective telescope, a pulse laser, and a camera [145]. Experiments performed with TNT, RDX, and HMX displayed detection capabilities of up to 30 meters away.…”

Section: Raman Spectroscopy and Surface-enhanced Raman Spectroscopymentioning

confidence: 99%

Developments in Explosives Characterization and Detection

Tourné

2014

J Forensic Res

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The continuous upsurge in terrorist activities makes it necessary to rapidly, efficiently, and reliably understand, detect, and/or prevent explosive threats. As such, intense research efforts continue to improve methods of detection and characterization of explosives through development of novel approaches and/or improvement of existing ones. This is especially true for home-made and/or improvised explosives devices. These next-generation threats require detection methods that will be sensitive and selective to a wide variety of traditional and non-traditional explosives and should be applicable in numerous detection scenarios. This review attempts to outline recent developments in the detection and characterization of explosives.

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“…In this context, the presented work is focused on short-pulse Raman spectroscopy chosen for remote detection. Raman spectroscopy was selected for its unique capability of being fast-responsive, highly sensitive, selective and able to identify different explosive compounds [3,4], precursors [5] and chemical warfare agents [6]. As previously demonstrated by Gallo et al [7], perhydro-1,3,5-trinitro-1,3,5-triazine (RDX) [8] was possible to be detected in the µg range at about 60 cm distance using well-defined homogeneous samples over an polished aluminum background.…”

Section: Introductionmentioning

confidence: 99%

Explosives and warfare agents remote Raman detection on realistic background samples

Cantu

Gallo

2022

Eur. Phys. J. Plus

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Ultraviolet Raman spectroscopy measurements have been taken to detect non-uniform and self-prepared samples of both explosives and warfare agent simulants on realistic backgrounds. The main goal was to quantify the minimum requirements for an unambiguous identification in remote detection (distance 50 cm) with a commercial Czerny-Turner spectrometer coupled with a ICCD camera. Different backgrounds in the categories of metals, natural, construction materials, transparent and plastics were used to simulate realistic encounters in a possible warzone scenario. The distribution of the chemicals was random in order to simulate a realistic measurement, and the exact detected amount was determined during the post-processing. Measurements show the capability of the developed Raman system to detect amount always in the range of μg range. Further data analysis will demonstrate the extension of the detection up to ng range for few cases. An analysis of the incident laser beam angle, size (diameter) and energy dependency is also discussed to demonstrate the technological limits outside the optimal detecting conditions.

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Standoff Raman Spectroscopic Detection of Explosive Molecules

Cited by 11 publications

References 26 publications

Nanosecond Gated Raman Spectroscopy for Standoff Detection of Hazardous Materials

Nanosecond Gated Raman Spectroscopy for Standoff Detection of Hazardous Materials

Developments in Explosives Characterization and Detection

Explosives and warfare agents remote Raman detection on realistic background samples

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