Patent ID: 9383420
Filing Date: 2016-07-05
CPC Classification: G01N,G01R,Y02A

Claim Text:
1. A Nuclear Magnetic Resonance (NMR) apparatus for measuring the water content of samples of solids and/or slurries, comprising: means for producing a homogeneous main magnetic field, a sample receiving space within said main magnetic field, means for producing a magnetic RF pulse for exciting a measurable RF magnetization to a sample placed into said sample receiving space at an operating frequency corresponding to the Larmor frequency of hydrogen nuclei in the sample, the operating frequency being directly proportional to said main magnetic field, the means for producing a magnetic RF pulse being inside the means for producing a homogeneous main magnetic field, and the RF magnetic field being perpendicular to the main magnetic field, means for measuring the RF signal of a free induction decay produced by the excited sample, and means for determining water content in the sample on the basis of said measured RF signal, wherein the means for producing a main magnetic field comprise a cooled resistive electromagnet wound with an aluminum conductor which is adapted to produce a main magnetic field corresponding to an operating frequency of 400-2000 kHz of the free induction decay.