Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1994-11-17
1995-11-28
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324318, G01R 3320
Patent
active
054711401
ABSTRACT:
An assembly which generates a magnetic field in a working volume spaced from the assembly. The assembly includes first and second magnets, each having a north and a south pole and a respective magnet axis which joins the north and south poles, the first and second magnets being positioned so that the respective magnet axes are along a main axis of the assembly and a pole of the first magnet faces a like pole of the second magnet. Third and fourth magnets, each having a north and a south pole and a respective magnet axis which joins the north and south poles, are positioned so that the respective magnet axes are substantially parallel with the main axis, wherein the position of at least one magnet of the group including the first, second, third and fourth magnets is adjustable in the direction of the main axis and the relative positions and field strengths of the first, second, third and fourth magnets are chosen to control the radial dimension and the characteristics of the magnetic field generated in the working volume.
REFERENCES:
patent: 4350955 (1982-09-01), Jackson et al.
patent: 4714881 (1987-12-01), Givens
patent: 4717876 (1988-01-01), Masi et al.
Mah Raymond Y.
O'Shea Sandra L.
Oxford Instruments Limited
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