USA As Represented by Secretary of the Navy

Mark A Hepp

Joel B Miller

Kenneth J McGrath

A nuclear quadrupole resonance (NQR) or nuclear magnetic resonance (NMR) apparatus which includes a probe and a variable impedance spectrometer. The probe emits a signal towards a specimen which causes the specimen to produce a resonance signal. After a recovery period from emitting the signal, the probe receives the resonance signal produced by the specimen. The variable impedance spectrometer is connected to the probe and has a total Q factor therewith. The spectrometer causes the total Q factor during the recovery period to be lower than the total Q factor before and after the recovery period by varying the impedance of the spectrometer, without changing the electrical configuration of the probe.

Apparatus and method for reducing the recovery period of a probe in pulsed nuclear quadrupole resonance and nuclear magnetic resonance detection systems by varying the impedance of a load to reduce total Q factor

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Accokeek, MD, United States of America

Mark A Hepp