KEYWORDS: Liquids, Magnetic resonance imaging, Signal detection, Magnetism, Explosives detection, Explosives, Signal to noise ratio, Composites, Scanners, Diffusion
Nuclear Quadrupole Resonance (NQR) and Nuclear Magnetic Resonance (NMR) are very prospective methods of the
bulk detection of explosives and illicit substances. Both methods are based on use of apparatus, which are very similar
technically and in some cases could be applied simultaneously. We report our experimental works on NQR/NMR
techniques for explosives detection. In addition of classical single-frequency NMR/NQR we also explored a potential of
double resonance (NMR/NQR) and multifrequency NQR approaches as well as magnetic resonance imaging (MRI)
techniques. Multifrequency (two/three) NQR technique involves various (two or three) transitions in the three energy
level system of 14N nuclei. It is shown that this kind of NQR technique allows filtering spurious signal after
radiofrequency pulses and increases the sensitivity of NQR detection. On the other hand, various liquids can be detected
using NMR. We shown that reliable discrimination among extended set of liquids reveal a need in use of additional
NMR parameters or complimentary techniques. It is demonstrated that MRI is also feasible method for detection of
explosive/illicit liquids.
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