The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2001
Filed:
Aug. 23, 2000
Bruker AG, Faellanden, CH;
Abstract
A magnet system for magnetic resonance spectrometers comprising an actively shielded superconducting magnet with a radially inner and a radially outer coil system (M,, M,), wherein the two coil systems carry the same current and have identical opposite dipole moments, and comprising a shim coil system for correcting magnetic field inhomogeneities in the working volume, whose z component varies in proportion to z,, is characterized in that the shim coil system comprises a radially inner shim coil set (S,) which is inductively decoupled from the magnet system and generates a magnetic field in the working volume, whose z component varies like &Dgr;H,+c,·z,with c,=const., and a radially outer shim coil set (S,) which is also inductively decoupled from the magnet system and generates a homogeneous magnetic field −&Dgr;H,in the working volume. This produces a Z,shim system with technically simple means which is, on the one hand, compact and does not waste any unnecessary space in the area of the magnet windings, and on the other hand is not susceptible to disturbances due to fluctuating external magnetic fields.