NMR probe superconductive transmit/receive switches
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Mar 28, 2007
filing date -
Mar 28, 2007
priority date (Note) -
Abandoned
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Abstract
A NMR (nuclear magnetic resonance) transmit/receive switch according to some embodiments of a nuclear magnetic resonance apparatus includes receive-path and/or transmit-path superconductors, which are selectively quenched to switch the connection of an NMR radio-frequency coil between transmit and receive circuits. In the transmit state, the transmit-path superconductor is in a superconducting state while the receive-path superconductor is quenched, to isolate a receive-path amplifier from the relatively higher powers of the NMR pulses applied to the sample by the transmit circuit. In the receive state, the receive-path superconductor is in a superconducting state while the transmit-path superconductor is quenched. A DC power source is used to supply supercritical current to the superconductors to quench the superconductors.
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