NMR sample rotor cooling technique
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Jul 31, 1992
filing date -
Jul 31, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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