US 5,347,254 AGranted

Tubular structure having transverse magnetic field with gradient

AssigneeThe United States of America as represented by the Secretary of the Army

InventorHerbert A. Leupold

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Abstract

A tubular structure having a transverse magnetic field that varies in eit the longitudinal direction or the lateral direction. In one embodiment, a permanent magnet tubular structure has a working magnetic field space that is partially bounded by pole pieces that reduce the height of the working magnetic field space. A laterally varying magnetic field is formed within the tubular structure. In another embodiment, a permanent magnet tubular structure is comprised of sections made of a permanent magnetic material, each section having a different remanence. The adjacent sections, having different remanence, form a linear array resulting in a longitudinally varying magnetic field gradient within the working space. The present invention has many practical applications such as in magnetic resonance imaging.

Claims6

Dependent claims

A tubular structure having a laterally varying transverse magnetic field comprising:

a first rectangular side magnet;
a second rectangular side magnet parallel to and spaced a distance from said first rectangular side magnet;
a top pole piece bridging the space between said first and second side magnets;
and
a bottom pole piece bridge bridging the space between said first and second side magnets opposite said top pole piece,
said first side magnet having a magnetic orientation with the greatest magnetic potential adjacent said top pole piece,
said second side magnet having a magnetic orientation with the greatest magnetic potential against said top pole piece,
said top and bottom pole pieces having a thickness such that a gap or working space within the tubular structure that decreases from said first side magnet to said second side magnet, whereby a laterally varying transverse magnetic field is formed between said top and bottom pole pieces.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/177,827Filed 5 Jan 1994 · division
Priority: 8 Mar 1993
Granted: 13 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H01F 7/0278
Magnetic circuits with PM for magnetic field generation: for generating uniform fields, focusing, deflecting electrically charged particles
G01R 33/383
Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field: using permanent magnets
H01F
Magnets
G01R
Measuring electric variables

Family

Serial28,483Parent of this division · filed 8 Mar 1993
US 5,347,254 AThis patent

From the US filing history. Foreign family members aren’t listed.

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