Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-10-21
2000-09-19
Barlow, John
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324303, 324314, 324300, 324322, 324318, G01V 301
Patent
active
061217735
ABSTRACT:
The invention is a nuclear magnetic resonance sensing apparatus comprising a magnet for inducing a static magnetic field in a region containing materials to be analyzed. The static magnetic field is polarized generally along the axis of the apparatus. The static magnetic field has a predetermined maximum longitudinal and maximum radial amplitude gradient. The apparatus includes a transmitter antenna for generating a radio frequency magnetic field in the region for exciting nuclei of the materials to be analyzed by conducting a radio frequency current through the transmitter antenna. The apparatus includes a receiving antenna for detecting a nuclear magnetic resonance signal from the excited nuclei. In a particular embodiment, the transmitter antenna and receiver antenna consist of coil pairs, each coil in a pair separated from the other by 90 degrees, to generate a circularly polarized RF magnetic field and to perform quadrature detection of the NMR signals.
Reiderman Arcady
Taicher Gersh (Zvi)
Barlow John
Fagin Richard A.
Shrivastar Brij B.
Western Atlas International Inc.
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