Cooled NMR probe head with thermal insulation of the sample
First Claim
1. An NMR (nuclear magnetic resonance) probe head for examining a sample substance in a sample tube, the probe head comprising:
- an RF receiver coil system;
means for cooling said receiver coil system to cryogenic temperatures;
a room temperature pipe extending along a z-direction, said room temperature pipe for receiving the sample tube; and
at least one radiation shield disposed between said receiver coil system and said room temperature pipe, said at least one shield extending in the z-direction and surrounding said room temperature pipe in a radial direction, said radiation shield comprising at least one material oriented in the z-direction, wherein said at least one material is one of substantially transparent to RF fields, absorbing of RF fields by <
5%, and absorbing of RF fields by <
1%.
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Accused Products
Abstract
An NMR (=nuclear magnetic resonance) probe head comprising an RF (=radio frequency) receiver coil system, which can be cooled down to cryogenic temperatures, and a room temperature pipe (4), extending in a z direction, for receiving a sample tube (6) containing sample substance (7) to be examined by NMR measurements is characterized in that at least one, preferably several radiation shields (9) extending in the z direction and surrounding the room temperature pipe (4) in a radial direction are disposed between the RF receiver coil system (1) and the room temperature pipe (4) which are formed of one or several materials oriented in the z direction and are almost completely transparent to RF fields, at least have an absorption of <5%, preferably <1% for RF fields to thereby provide simple and substantial reduction in the temperature gradient in the z direction during operation without thereby impairing the NMR measurement.
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Citations
42 Claims
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1. An NMR (nuclear magnetic resonance) probe head for examining a sample substance in a sample tube, the probe head comprising:
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an RF receiver coil system;
means for cooling said receiver coil system to cryogenic temperatures;
a room temperature pipe extending along a z-direction, said room temperature pipe for receiving the sample tube; and
at least one radiation shield disposed between said receiver coil system and said room temperature pipe, said at least one shield extending in the z-direction and surrounding said room temperature pipe in a radial direction, said radiation shield comprising at least one material oriented in the z-direction, wherein said at least one material is one of substantially transparent to RF fields, absorbing of RF fields by <
5%, and absorbing of RF fields by <
1%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification