Anticipative temperature regulation of cryogenic NMR probes
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United States of America Patent
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Dec 18, 2007
Grant Date -
May 3, 2007
app pub date -
Oct 28, 2005
filing date -
Oct 28, 2005
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Abstract
In some embodiments, a nuclear magnetic resonance (NMR) method comprises generating an indicator of an anticipated time-averaged power for a radio-frequency (RF) pulse set, and anticipatively adjusting a cooling supplied by a cryogenic cooling fluid to an RF coil according to the indicator of the anticipated time-averaged power. The cryogenic cooling adjustment may be performed using a cryogenic fluid heater and/or a mass flow controller disposed in the cryogenic fluid path. The time difference between the start of the cooling adjustment and the start of the RF pulse set is set to be equal to the difference in timescales between the cooling effect of the cooling adjustment and the heating effect of the RF pulse set on the RF coil.
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