Talanta. Jan 15; doi: /a Epub Nov Current trends in explosive detection techniques. Caygill JS(1), Davis F. This review provides a consolidation of information relating to recent advances in explosive detection techniques without being limited to one specific research. This review provides a consolidation of information relating to recent advances in explosive detection techniques without being limited to one.
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One must rely on identifying a unique explosive detection techniques from a thermal pattern of the outer surface of the target. The resulting image is blurred by the effects of thermal conduction and air convection in and around clothing.
Items other than explosives e. Research in the IR spectral range is needed to study the spectroscopic properties e. This information might lead to differential spectroscopic techniques that could improve IR imaging for explosive detection.
To optimize explosive detection techniques detection, other important areas for development include cooled detector arrays and advanced image processing techniques.
Current trends in explosive detection techniques. - Semantic Scholar
In summary, IR imaging is a very important technique for explosive detection techniques detection. Its advantages are the readily accessible technology, real-time response, and sensitivity to the image patterns typical of suicide bomber scenarios.
Its disadvantage is the lack of specificity for explosives or explosive type. One could use it as a preliminary screening process for sorting out potential explosive carriers.
Terahertz Clothing explosive detection techniques many other materials become nearly transparent as the radiation wavelength increases to the terahertz range, wavelengths longer than microns corresponding to 1-THz frequencies. Imaging in this region allows detection of explosives hidden beneath clothing without the danger of explosive detection techniques radiation.
There is hope that explosives will be found to have distinguishing spectral features in this spectral range so that one will have something more than simple shapes with small dielectric index contrasts to use as explosive identifiers. Explosives certainly have unique spectral features due to the bending and twisting modes of the explosive molecules.
Current trends in explosive detection techniques.
However, the sharp spectral lines associated with these modes in the gas phase will probably be broadened so much in the solid and liquid phases that they cannot be used for unique identification. There is also the possibility that the radiation scattering caused by the granularity or crystal structures of explosives could enhance image contrast.
Health hazards for terahertz and microwave radiation do not explosive detection techniques to be a major concern. This should allow for more than adequate explosive detection techniques illumination of portal areas and even wide areas at sports events or travel terminals.
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Passive thermal radiation is another possibility for imaging; however detecting small differences in thermal radiation in this spectral region is very challenging and would probably require detectors cooled explosive detection techniques very low temperatures.
Sources in use at present include gas lasers 10 that are bulky and lack stability for field environments.
Pulsed sources 11 based on photocurrents induced by ultra-short laser pulses are inefficient sources that require large optical input powers and only achieve tens of microwatts average output power at present.
High-power free electron laser sources 12 are being developed, but they are far too large and expensive for applications to explosive detection. A very explosive detection techniques potential, compact, low-cost source is the quantum cascade laser. These tiny semiconductor explosive detection techniques have now been operated down to frequencies as low as 1.
Explosive detection - Wikipedia
Compact sources with output powers between 10 mW and 1 W would be very useful for illuminating explosive detection techniques explosive scenarios in the terahertz range. At slightly lower frequencies in the range between GHz and 1 THz, powerful gyrotron tube sources 15 are being developed.
These can generate up to megawatts of power in pulsed mode and kilowatts in continuous operating mode. These sources could be used to actively illuminate wide areas for explosive surveillance. Enhanced image resolution is the advantage explosive detection techniques the shorter-wavelength terahertz regime.
Laser action and explosive detection techniques,and microns in optically pumped CH3F, Optical Communications1,e. Nature Mater1,