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Nuclear Quadrupole ResonanceNuclear Quadrupole Resonance or NQR is a technique related to nuclear magnetic resonance (NMR) which is used to detect atoms whose nuclei have a nuclear quadrupole moment, such as 14N or 63Cu. Since unlike NMR, NQR is done in an environment without a magnetic field, it is sometimes called "zero-field NMR". NQR freqencies are temperature dependant. There are several research groups around the world currently working on ways to use NQR to detect explosives, for example, to aid in landmine detection and removal. A hypothetical land mine detection unit would consist of an antenna which would generate a radio frequency pulse near the excitation frequency of the material being detected, then would simply "listen" for a response RF signal coming from the explosive component of the mine.
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