Sample holder for use in NMR
First Claim
1. A nuclear magnetic resonance (NMR) pressurizable sample holder configured for retaining a fluid sample during a performance of an NMR examination, comprisinga pressure-retaining nonmagnetic tube formed of non-metallic electrically insulating matrix material which is reinforced with electrically conductive filaments that are configured and arranged within the non-metallic electrically insulating matrix material to directionally inhibit induced eddy currents by having less conductivity in a direction transverse to the reinforcing electrically conductive filaments than in a direction along a length of the reinforcing electrically conductive filaments;
- gradient coils that are spaced around the pressure retaining nonmagnetic tube, wherein the gradient coils are configured to be switched on and off during the performance of the NMR examination, and where the gradient coils generate the induced eddy currents that the reinforcing electrically conductive filaments are configured and arranged to directionally inhibit;
the pressure-retaining nonmagnetic tube also being positioned to surround at least one radio-frequency coil, and the at least one radio-frequency coil being positioned to surround a space configured for retaining the fluid sample.
2 Assignments
0 Petitions
Accused Products
Abstract
A pressurizable holder for a sample to be examined by NMR, comprises a pressure retaining nonmagnetic tube surrounding a radio-frequency coil which in turn surrounds a space for the sample. The pressure retaining tube is formed of (i) nonmetallic electrically insulating material such as a ceramic or (ii) nonmetallic electrically insulating matrix material reinforced with electrically insulating filaments such as glass fiber, or (iii) non-metallic electrically insulating matrix material reinforced with electrically conductive filaments configured so that conductivity is anisotropic. There is good coil filling factor without constraint on wall thickness of the pressure retaining tube. Avoidance of isotropically conductive material inhibits eddy currents when an NMR spectrometer'"'"'s magnetic field gradient coils are switched on and off. The tube resists hoop stress from internal pressure. Longitudinal stress is resisted by structure connecting end pieces at the ends of the pressure retaining tube.
18 Citations
15 Claims
-
1. A nuclear magnetic resonance (NMR) pressurizable sample holder configured for retaining a fluid sample during a performance of an NMR examination, comprising
a pressure-retaining nonmagnetic tube formed of non-metallic electrically insulating matrix material which is reinforced with electrically conductive filaments that are configured and arranged within the non-metallic electrically insulating matrix material to directionally inhibit induced eddy currents by having less conductivity in a direction transverse to the reinforcing electrically conductive filaments than in a direction along a length of the reinforcing electrically conductive filaments; -
gradient coils that are spaced around the pressure retaining nonmagnetic tube, wherein the gradient coils are configured to be switched on and off during the performance of the NMR examination, and where the gradient coils generate the induced eddy currents that the reinforcing electrically conductive filaments are configured and arranged to directionally inhibit; the pressure-retaining nonmagnetic tube also being positioned to surround at least one radio-frequency coil, and the at least one radio-frequency coil being positioned to surround a space configured for retaining the fluid sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification