High-resolution NMR probe
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United States of America Patent
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Sep 6, 2011
Grant Date -
Dec 23, 2010
app pub date -
Jun 19, 2009
filing date -
Jun 19, 2009
priority date (Note) -
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Abstract
A high-resolution NMR probe is offered which is simple in structure and can be fabricated at low cost. The inside of the probe is maintained in a vacuum to adiabatically isolate the inside from the outside. Liquid helium is sent into a first heat exchanger located immediately close to a measurement portion via the innermost region of a triple tube placed in the vacuum. The helium is evaporated in the exchanger to cool a transmit-receive coil and a variable capacitor. The evaporated helium gas is returned via the outermost region of the triple tube. At this time, a radiation shield placed in the vacuum is cooled by a second heat exchanger placed in the return path.
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