Article published Trace explosives
Faster detection for better protection
Nebulex is a device that detects trace explosives in the atmosphere based on the concentration of explosive vapors in a liquid medium. It is particularly well suited for detecting traces of TNT.
CEA researchers have developed a unique system for the detection of trace explosives in the atmosphere. Nebulex, as it is called, is unique in that it makes it possible to concentrate ambient explosive vapors in a liquid medium and detect them in situ using a colorimetric reagent. It can be used to detect explosives, as well as certain markers present in trace explosives near suspect packages. Nebulex operates based on a patented principle: a pump samples air and passes it into a closed condensation-evaporation system where the airborne particles are concentrated in a liquid. Trace explosive detection is then performed within this solution using an optical device that detects color changes in a colorimetric reagent suitable for this purpose. “The system is cumulative, therefore allowing for continuous operation”, explains Lionel Hairault, Head of the physical chemistry laboratory of the military applications division (CEA DAM). “In addition, it allows on-site sampling for subsequent laboratory analysis.” Tests conducted under real conditions have yielded excellent results for TNT: detection of seven TNT molecules among one billion air molecules in five minutes. Nebulex will eventually be miniaturized to form a transportable (approx. 10 kg), easy-to-use, standalone device offering reliable and rapid measurements. A fluorescence detection module will be integrated for optimal response time.
