NMR sample rotor cooling technique

Details NMR sample rotor cooling technique NMR sample rotor cooling technique

1992-07-31

1994-02-22

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324307, G01V 300

Patent

active

052891305

ABSTRACT:
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.

REFERENCES:
patent: 4254373 (1981-03-01), Lippmaa et al.
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patent: 4456882 (1984-06-01), Doty
patent: 4511841 (1985-04-01), Bartuska et al.
patent: 4739270 (1988-04-01), Daugaard et al.
patent: 4899111 (1990-02-01), Pines et al.
patent: 4940942 (1989-04-01), Bartuska et al.
patent: 5202633 (1993-04-01), Doty et al.

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