초록 ▼

The frictional heating of an NMR sample spinner supported on a cylindrical gas bearing inside a cylindrical bearing stator is negated by recirculating the turbine exhaust gas over the rotor surface inside the RF coil. The technique is more effective with microturbines of relatively high insentropic

The frictional heating of an NMR sample spinner supported on a cylindrical gas bearing inside a cylindrical bearing stator is negated by recirculating the turbine exhaust gas over the rotor surface inside the RF coil. The technique is more effective with microturbines of relatively high insentropic efficiency. Plugs extend axially into the sample container from each end so that the sample is confined to the central region beyond the gas bearing region so the thermal gradients are minimized and RF homogeneity is improved.

대표청구항 ▼

An NMR sample spinner comprising: a sample container having a first end and a second end supported on a gas bearing inside a bearing stator; a radio frequency coil surrounding a central portion of said sample container; said bearing stator including a plurality of bearing orifices in communication w

An NMR sample spinner comprising: a sample container having a first end and a second end supported on a gas bearing inside a bearing stator; a radio frequency coil surrounding a central portion of said sample container; said bearing stator including a plurality of bearing orifices in communication with radial bearing regions near both ends of said sample container; a first microturbine co-axially attached to said sample container at the first end thereof to effect spinning of said sample container; a housing for distributing pressurized gas to said bearing orifices and said microturbine; means for causing the exhaust gas from said microturbine to circulate over the central surface of said sample container.