Electricity: measuring and testing – Particle precession resonance
Patent
1998-11-17
2000-08-15
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
324307, G01V 300
Patent
active
061041904
ABSTRACT:
A Nuclear Quadrupole Resonance (NQR) method and apparatus for detecting the presence of a nitramine explosive, with a reduced probability of spurious triggering of consumer electronics. In the method and apparatus, a signal is emitted towards a nitramine explosive so that a nitro group in the namine explosive produces an NQR resonance signal. The NQR resonance signal is then detected to thereby detect the presence of the nitramine explosive. If the nitramine explosive is RDX, the NQR resonance signal of the nitro group is at a frequency which is either 502.3 kHz, 500.5 kHz, 405.1 kHz, 396.2 kHz or 384.1 kHz. Such frequencies are much lower than those in conventional detection techniques. As a result, the probability of the undesirable spurious triggering of electronic items exposed to the NQR RF pulses will be reduced, due to the reduction in induced voltage at lower frequency. The detection sensitivity is also reduced, but in many cases will still be adequate to detect nitramine explosives.
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Buess Michael L.
Garroway Allen N.
Arana Louis
Edelberg Barry A.
Karasek John J.
The United States of America as represented by the Secretary of
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