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1. (EP0605948) Improvements relating to sample monitoring

Office : European Patent Office
Application Number: 93309088 Application Date: 12.11.1993
Publication Number: 0605948 Publication Date: 13.07.1994
Publication Kind : B1
IPC:
G 01R
G01R 33/44
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
CPC:
G01R 33/44
Applicants: OXFORD ANALYTICAL INSTR LTD
Inventors: CROOKELL ANDREW
VAN WYK CLAUDIUS BALDWIN
Priority Data: 9300318 08.01.1993 GB
Title: (DE) Verbesserungen an Proben-Überwachung
(EN) Improvements relating to sample monitoring
(FR) Améliorations aux contrÔles d'échantillons
Abstract: front page image
(EN) Apparatus for monitoring a sample having 'solid' and 'liquid' content as hereinbefore defined, the apparatus comprising a magnetic field generator (3) for subjecting the sample to a static magnetic field in the first direction to cause the magnetic vectors of nuclei to precess about the first direction; means (2) for reorienting the bulk magnetic vector of the sample so as to gain a component in a plane orthogonal to the first direction and for monitoring the resultant FID; and a controller (8) for causing the apparatus to carry out the following steps. i) Causing the bulk magnetic vector to gain a component in a second direction orthogonal to the first direction; ii) after a first relaxation period less than the time for the 'solid' component of the resulting FID to decay to zero, causing the spins of the nuclei to rephase in such a way as to give an echo from which the 'solid' component in the sample can be determined; iii) after a second relaxation period, following step (ii), and during which the part of the FID due to the 'solid' content of the sample decays to zero, causing the spins of the nuclei to rephase giving an echo arising from the 'liquid' component of the sample; and iv) monitoring the resultant FID signal after step (ii) and after step (iii) to obtain a measure of the 'solid' and 'liquid' content of the sample.
Also published as:
US5539309DE000069323054