Remote (inside-out) NMR. I. Remote production of region of homogeneous magnetic field

An Open Magnet Utilizing Ferro-Refraction Current Magnification

“…Interestingly, magnetic shielding permits the field to be modeled in terms of current segments (as in Eq. [4]) as opposed to current loops. The second advantage provided by high µ materials is the effect of field magnification.…”

“…This "openness" may revolutionize surgery by providing all MR techniques to the operating room. The first of this type of magnet was used in an industrial application and provided an external radial field (4). Other monohedral designs have been proposed (5)(6)(7)(8)(9)(10)(11).…”

NMR well logging at Schlumberger

“…One result was the construction of a novel borehole NMR tool at Los Alamos National Laboratory (13)(14)(15). Although many patents describing NMR magnet-and-coil devices for borehole application had been issued in the decades since 1950 (3), most of those designs looked improbable and there was no indication that any had ever been built.…”

NMR in well logging and hydrocarbon exploration

“…For about 30 years , borehole N M R was based on free-precession experiments in the earth field at 2 kHz [9,10]. This approach, however, proved to be inferior to the pioneering work of Jasper Jackson and co-workers at the Los Alamos National Laboratory in the 1980s [11][12][13]. Jackson placed a permanent magnet in a borehole and demonstrated pulse-echo techniques that are the basis o f today's measurements.…”