Patent ID: 6242918
Filing Date: 2001-06-05
Classification: G01R

Abstract:
An apparatus comprising:a probe for generating an RF magnetic field at a specimen which causes the specimen to produce a resonance signal and, after a recovery period from emitting the signal, receiving the resonance signal produced by the specimen; anda spectrometer presenting a variable impedance load to the probe and having a total Q factor therewith, the spectrometer causing 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, without changing the electrical configuration of the probe;wherein the spectrometer comprises:a transmitter generating a pulse, for transmission to said probe;wherein the probe produces an output signal corresponding to the received resonance signal, and the spectrometer further comprises:a receiver receiving and analyzing the output signal of the probe;further comprising:a transmit/receive switch which, to generate an RF magnetic field from the probe, connects the transmitter to the probe while disconnecting the receiver from the probe, and, to receive a resonance signal produced by a specimen, connects the receiver to the probe while disconnecting the transmitter from the probe;wherein the spectrometer further comprises:a control unit producing a control signal which is controllable to vary the recovery period.