An Efficient Fast Recovery Scheme for Nuclear Quadrupole Resonance Single Coil Probe

An active Q-switching circuit using a transformer for reducing probe recovery time just after the RF excitation was described. MOSFET controls the coupling and uncoupling to the Q-switching circuit from the probe. It doesn’t create new ringing and doesn’t operate during the reception of nuclear quadrupole resonance signal and there’s no loss in sensitivity. Experimental results prove that the probe recovery time is reduced and SNR is increased by this circuit.