US 11,668,774 B2
Sample extension on the sampling head side to reduce the B0 field disturbance at the end of the sample tube
Daniel Schmidig, Schaffhausen (CH)
Appl. No. 17/904,654
Filed by Bruker Switzerland AG, Fällanden (CH)
PCT Filed Jan. 29, 2021, PCT No. PCT/EP2021/052064
§ 371(c)(1), (2) Date Aug. 19, 2022,
PCT Pub. No. WO2021/165014, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 10 2020 202 243.7 (DE), filed on Feb. 21, 2020.
Prior Publication US 2023/0094745 A1, Mar. 30, 2023
Int. Cl. G01R 33/31 (2006.01)
CPC G01R 33/31 (2013.01) 12 Claims
OG exemplary drawing
 
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.