DOR NMR sample spinner

Details DOR NMR sample spinner DOR NMR sample spinner

1992-03-26

1994-06-28

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

G01V 300

Patent

active

053250591

ABSTRACT:
An NMR DOR sample spinner includes an inner-rotor that is driven by a radial-inflow microturbine at each end, supported radially by anti-whirl air bearings, and supported axially by thrust bearings at each end thereof. The DOR spinner further comprises an outer-rotor that houses the inner-rotor bearing and drive nozzles such that the inner-rotor axis is inclined with respect to the axis of the outer-rotor at an angle of typically 30.56.degree.. The outer-rotor is driven by a radial-inflow microturbine at each end, supported radially on anti-whirl air bearings, and supported axially by thrust bearings at each end thereof. The outer-rotor further comprises ceramic bearing races at each end that hold the sample drive nozzles in place. The outer microturbines are screwed to the outer-rotor and hold the bearing races in place. Drive and bearing gas for the inner-rotor is supplied through slip-fit, precision axial tubes at each end of the outer-rotor. The rf magnetization coil surrounds the central region of the outer-rotor, and rf shield rings limit the axial extent of the rf magnetic field.

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"NMR Experiments With a New Double Rotor", Journal of Magnetic Resonance, 89, 297-308 (1990) by Wu et al. (no month).
"High Efficiency Microturbine Technology", Proceedings, IECEC-91, Aug. 1991 by Doty et al.
"A Refrigeration System Incorporating A Low-Capacity, High-Speed, Gas-Bearing Supported Expansion Turbine", Advances in Cryogenic Engineering, vol. 8, 1962 by Mann et al. (no month).
"Double Rotor for Solid-State NMR" by Samoson et al. Rev. Sci. Instrum. 60 (10), Oct. 1989.

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