METHOD FOR REMOTE DETECTION OF SUBSTANCE IN NONUNIFORM MAGNETIC FIELD USING NUCLEAR MAGNETIC RESONANCE Russian patent published in 2012 - IPC G01N24/08 

FIELD: physics.

SUBSTANCE: analysed object is placed in a nonuniform magnetic field with pulsed stimulus of the unknown chemical element in the analysed object and a nuclear magnetic resonance (NMR) signal response is obtained from the action on the object in form of distribution of the relationship between NMR signal intensity and frequency, wherein the distribution of intensity the nonuniform magnetic field from spatial coordinates is measured and stored on all three spatial coordinates beforehand, and characteristic distribution of intensities of the NMR signal response from frequency from the analysed object without the concealed substance is also stored beforehand; the obtained NMR signal response from the analysed object is used to find frequency ν_peak, on which intensity of the NMR signal response differs from the stored intensity for that object; Zeeman formula at frequency ν_peak is used to find B_peak (where B_peak is the unknown intensity of the local external magnetic field) and the predetermined distribution of intensity of the nonuniform magnetic field is used to find spatial position of magnetic fields with intensity close to B_peak, thus determining the spatial position of the substance concealed in the object.

EFFECT: obtaining a spatial distribution pattern of an unknown chemical substance in an object in the shortest possible time.

5 cl, 4 dwg