Cylindrical permanent magnet with longitudinal induced field
US5014032A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/383
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cylindrical permanent magnet with a longitudinal induced field may be achieved by creating on either side of a zone of interest two annular structures magnetized on the one hand radially with respect to the cylinder axis and on the other hand antisymetrically with respect to the zone of interest. The annular structures may be achieved by arrangements of blocks on polygonal contours. In order to optimize fabrication, the number of blocks in each ring must be higher or equal to four times the number of rings in each structure. The magnet applies particularly to the field of imaging by nuclear magnetic resonance wherein the control logistics had originally been designed for longitudinal induction fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.