Electricity: measuring and testing – Particle precession resonance
Patent
1989-10-13
1992-12-29
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
324308, G01R 3320
Patent
active
051754991
ABSTRACT:
Both an antipilferage marker and a system therefor is provided that uses magnetic spin resonance phenomena to generate unique and identifiable signals. The marker generally comprises a substrate which supports a material that generates and identifiable signal as a result of either nuclear magnetic resonance, nuclear quadrupole, electron spin resonance, electron paramagnetic resonance, ferromagnetic resonance, ferrimagnetic resonance, antiferrimagnetic resonance, domain wall resonance or spin wave resonance or spin-echoes. A magnetic material is further provided on the substrate for applying a magnetic field to the resonant material. In the system of the invention, a microwave or radio frequency source emits electromagnetic radiation which is absorbed by the resonant material which in turn reemits electromagnetic radiation having a specific and readily detectable frequency signature.
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