ANTENNA SYSTEM FOR DETECTING NUCLEAR RESONANCE, EXCLUDING EFFECT OF INDUCED INTERFERENCE AND TRANSIENT PROCESSES Russian patent published in 2009 - IPC G01N24/08 

FIELD: nuclear physics.

SUBSTANCE: invention can be used to detect nuclear magnetic resonance. The antenna system for detecting nuclear resonance, excluding induced interference and transient processes has a metallic shield and an inductance coil. The inductance coil consists of series-connected two flat identical spirals, lying on both sides of the shield, made in form of a flat metal sheet, where the plane of the spirals is perpendicular to the plane of the shield and the spirals lie equidistant from the shield. Two identical capacitors are formed by windings of the spirals and the metallic shield. Under the effect of a radio frequency pulse, the spirals form two inphase working resonance circuits, connected to the output of a matching circuit. In signal reception mode, the spirals form one resonance circuit and are connected in series and are antiphased. The matching circuit is in form of an inverted-L shaped circuit, the input of which is the series connected first and second pairs of antiparallel-connected diodes and matching capacitor, and the output is the series-connected second pair of antiparallel-connected diodes and matching capacitor. The output of the matching circuit is connected to the centre of the inductance coil, and the input of the receiver is connected to any end of the inductance coil.

EFFECT: exclusion of the effect of induced interference and transient processes on detection results.

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