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:
Jun. 22, 1993
Filed:
Oct. 03, 1991
Arne Kasten, Karlsruhe, DE;
Reinhard Biehl, Karlsruhe, DE;
Bruker Analytische Messtechnik GmbH, Rheinstetten-Forchheim, DE;
Abstract
An NMR spectrometer is utilized in order to determine the magnetic susceptibility of a sample, in which, by means of the sample, a change in the homogeneous magnetic field in the region of a probe substance is effected and the change in the spectrum of the probe substance which is thereby caused is observed. A method known in the art is based on the modulation of the resonance frequency which occurs when the probe substance is caused to rotate about an axis perpendicular to the direction of the magnetic field. The application of this method encounters difficulties with spectrometers whose probe volume is penetrated axially by the magnetic field. In accordance with the invention, by means of the sample (14), a change is produced in the magnetic field along the probe axis in a sample substance (12) preferentially positioned along the direction of the magnetic field. This change effects a structuring of the resonance line with maxima whose distance is directly proportional to the susceptibility of the sample substance. A proportionality factor is dependent (upon the geometry of the sample (14). Preferentially a fluid in a double walled tube (11, 13) is utilized as probe substance (12) upon whose outer side is positioned a ring shaped sample (14) of the material to be examined.