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US 7,352,185 B1Granted
Multi-functional NMR probe
AssigneeVarian, Inc.
InventorsAlbert P. Zens, James P. Finnigan
Life of this patent
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Abstract
A single RF port, multiply-resonant circuit comprises coupled resonant sub-circuits coupled through an adjustable reactive element exhibiting a dynamic range that includes a value of the reactive component of sufficient magnitude to produce an impedance producing substantial mutual isolation of the sub-circuits.
Claims6
An NMR probe for investigations of a plurality of nuclear species exhibiting a corresponding plurality of resonant frequencies, said probe comprising:
- a) a first resonant sub-circuit capable of tuning to a selected one of said resonant frequencies and further comprising an RF port r communicating with an external RF apparatus;
- b) a second resonant sub-circuit capable of tuned response to another of said resonant frequencies;
- and
- c) an RF switch comprising a reactive element coupling said first and second sub-circuits, said RF switch capable of introducing a state of substantial isolation between said sub-circuits, said state of isolation achieved without structural alteration of either said sub-circuits.
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A balanced NMR probe for investigations of a plurality of nuclear species exhibiting a corresponding plurality of resonant frequencies, said probe comprising:
- a) a first resonant sub-circuit capable of tuning to a selected one of said resonant frequencies and further comprising an RF port for communicating with an external RF apparatus;
- b) a second resonant sub-circuit capable of tuned response to another of said resonant frequencies;
- and
- c) a pair of RF switches comprising a corresponding pair of reactive elements for balanced coupling of said first and second sub-circuits, said RF switches capable of introducing a state of substantial isolation between said sub-circuits.
1 more element
Dependencies are inferred from the claim text.