A probe (80) for irradiating a sample with RF energy during transmitting
periods and detecting an NQR or NMR signal from a substance contained
within the sample during receiving periods. The probe (80) comprises a
variable impedance unit (20) for changing the Q-factor of the probe and a
probe coil. The probe (80) is responsive to powerful RF pulses applied
thereto to excite an RF magnetic field in the probe coil during the
transmitting periods. The variable impedance unit (20) is controllable to
provide a Q-factor for the probe (80) at:
(i) an optimal level during a prescribed transmitting period of an RF
pulse for irradiating the sample with said RF energy;
(ii) a minimal level during a prescribed recovery period immediately
following said transmitting period to rapidly dampen transient signals
from the probe; and
(iii) a maximal level during a prescribed receiving period for detecting
an NQR or NMR signal from the target substance if present, immediately
following the recovery period.
A method for detecting an NQR or NMR signal within a sample using the
probe (80) is also described.
