CPC G01R 33/31 (2013.01) | 12 Claims |
1. A sampling head for an NMR apparatus comprising:
an RF transmission and reception coil system;
an opening extending in a z direction for receiving a sample tube containing a sample substance to be analyzed by means of NMR measurement; and
a compensation element which at least partially compensates for disturbances of a homogeneous magnetic field B0 due to the sample substance and a material of the sample tube at a sampling end of the sample tube protruding into the sampling head during a measuring operation, the compensation element being arranged outside the sample tube and protruding into the sampling head during the measuring operation and in the z direction below the sampling end, and being movably mounted in the z direction on a spring device acting in the direction of the z axis or on an air cushion formed by a flow of temperature control gas in the sampling head.
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