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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> Cooled NMR Probe Head And NMR Analyzer

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