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0.2 second test for explosive liquids

Since a failed terrorist attack in 2006, plane passengers have not been able to carry bottles of liquid through security at airports, leaving some parched at the airport and others having expensive toiletries confiscated, but work by a group of physicists in Germany is paving the way to eliminate this necessary nuisance.

Research published today, Tuesday, 20 October, in IOP Publishing's Superconductor Science and Technology explains how a new form of spectroscopy, a scientific method that uses electromagnetic radiation to identify materials, and a novel nanoelectronic device to detect signals, can identify explosive liquids, or liquid components for the fabrication of explosives, in usual plastic bottles almost instantly.

Discussing the different molecular signatures, or atomic make-up, of simple liquids such as water, ethanol and acetone (a flammable liquid), the researchers from Forschungszentrum Jlich, an inter-disciplinary research centre situated between Aachen and Cologne in Germany, explain the need to extend the frequency range of spectral analysis to increase the reliability of liquid explosive detection.

While the idea of using electromagnetic radiation to inspect the properties of liquids is already thought a viable route to detecting explosive liquids, previous devices, working at single fixed frequencies within a small frequency range, cannot unambiguously distinguish mixtures of different liquids containing dangerous components which can be used as an explosive.

The researchers from Jlich have suggested a fast and reliable way to increase the range of frequencies that their spectrometer can analyse, thereby verifying the molecular signature of the liquid and creating a much more detailed 'thumbprint' that can be checked against the range of possibly dangerous liquids available to terrorists.

The researchers' new method of spectrometry is called Hilbert spectroscopy. It works over a wider ran

Contact: Joseph Winters
Institute of Physics

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