Homogenization device for homogenization of a magnetic field

Patent metadata

Field	Value
Publication number	US-9846209-B2
Application number	US-201414462746-A
Country	US
Kind code	B2
Filing date	Aug 19, 2014
Priority date	Aug 20, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A homogenization device for homogenization of a magnetic field with an non-magnetic carrier and compensation elements formed of a magnetic material, the carrier having a carrier wall and the carrier wall surrounding a carrier interior, in the homogenization device located in the magnetic field the magnetic field penetrating into the carrier interior through a first carrier region of the carrier wall and emerging from the carrier interior through a second carrier region of the carrier wall and each of the compensation elements which are located on the carrier contributing to the homogenization of the magnetic field at least in the carrier interior. In the homogenization device, handling during homogenization is improved in that there are recesses in the carrier wall and in each of the recesses at least one of the compensation elements can be directly inserted and removed.

First claim

What is claimed is:

1. A homogenization device for homogenization of a magnetic field, comprising: a non-magnetic cylindrical carrier having a carrier wall surrounding a carrier interior, wherein, with the homogenization device located in a magnetic field, the magnetic field penetrating into the carrier interior through a first carrier region of the carrier wall and emerging from the carrier interior through a second carrier region of the carrier wall and
compensation elements formed at least partially of a magnetic material, each of the compensation elements being located at the carrier for contributing to homogenization of the magnetic field at least in the carrier interior,
wherein a plurality of recesses are provided in the carrier wall matched in shape to the shape of the compensation elements and at least a respective one of the compensation elements being removably inserted directly in each of the recesses,
wherein the shape of at least one of the compensation elements has a longitudinal compensation element axis which coincides with a longitudinal axis of at least one of the recesses, the longitudinal axes of the compensation elements and of the recesses both extend perpendicular to a longitudinal axis of the cylindrical carrier.

2. The homogenization device in accordance with claim 1 , wherein at least one of the recesses is provided in at least one of the first carrier region and the second carrier region.

3. The homogenization device in accordance with claim 1 , wherein at least one subset of the recesses forms a regular pattern in the carrier wall.

4. The homogenization device in accordance with claim 3 , wherein the at least one subset of the recesses is in the form of a blind hole with a bottom and a circumferentially surrounding wall and the at least one subset of the recesses formed as blind holes having the same geometry.

5. The homogenization device in accordance with claim 4 , wherein the carrier wall has an outer side and wherein at least one of the recesses in the form of a blind hole is in the outer side of the carrier wall.

6. The homogenization device in accordance with claim 5 , wherein the carrier wall has an inner side and wherein an ejection is provided in the inner side of the carrier wall, the ejection opening joining to the bottom of the blind hole of the recess for enabling ejecting of the compensation element inserted in the recess.

7. The homogenization device in accordance with claim 1 , wherein at least one of the recesses has a recess axis , at least one of the compensation elements being insertable solely by movement along the recess axis and the sole remaining translational freedom of the inserted compensation element being along the recess axis.

8. The homogenization device in accordance with claim 7 , further comprising at least one cover which is mountable over the carrier in a manner that prevents movement of the inserted compensation element along the recess axis.

9. The homogenization device in accordance with claim 1 , wherein in at least one of the recesses has an internal thread and at least one of the compensation elements has a matching external thread for enabling the at least one of the compensation elements to be screwed into the at least one of the recesses.

10. The homogenization device in accordance with claim 1 , wherein the magnetic material of at least one of the compensation elements comprises at least one of a soft magnetic material and a hard magnetic material.

11. The homogenization device in accordance with claim 10 , wherein the magnetic material is a hard magnetic material and wherein hard magnetic material is a permanent magnet having a magnet axis that coincides with an axis of the compensation element axis.

12. The homogenization device in accordance with claim 10 , wherein the magnetization of the hard magnetic material of at least one of the compensation elements has been provided by a local magnetization magnetic field.

13. The homogenization device in accordance with claim 1 , wherein that at least one of the compensation elements which has a compensation element axis has at least one layer of a magnetic material and at least one layer of a non-magnetic material.

14. The homogenization device in accordance with claim 11 , wherein the compensation element axis of at least one of the compensation elements has a preferred magnetic axis that coincides with the magnetic axis of the magnetic material.

Assignees

• Krohne Ag

Inventors

• De Graaf Ariël
• Van Der Linden Henry
• Pors Jan Teunis Aart
• Ramondt Jan-Willem

Classifications

• G01F1/716

  using electron paramagnetic resonance [EPR] or nuclear magnetic resonance [NMR] · CPC title

• G01N24/08

  by using nuclear magnetic resonance (G01N24/12 takes precedence) · CPC title

• G01R33/34046

  Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils · CPC title

• G01F15/00

  Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus · CPC title

• G01R33/3873 Primary

  using ferromagnetic bodies {; Passive shimming} · CPC title