What the machine captures from the subject is the relaxation of the atoms as they return to their normal alignment when the RF pulse is temporarily ceased.
T2 is a measure of the loss of coherence that excludes static dephasing, using an RF pulse to reverse the slowest types of dipolar interaction.
In general, the rate of decay of an ensemble of spins is a function of the interaction times and also the power of the RF pulse.
Radar-based IFF is also called secondary radar, with primary radar bouncing an RF pulse off of the aircraft to determine position.
A resonant RF pulse was applied which, if applied alone, would cause the entire ground state population to migrate into an excited state.
The ion trap was then regularly "measured" by applying a sequence of ultraviolet pulses, during the RF pulse.
Given a desired magnetization profile, determining the RF pulse that will produce it is not trivial.
Operations are performed on the ensemble through RF pulses applied perpendicular to a strong, static field, created by a very large magnet.
The MRI machine emits an RF (radio frequency) pulse that specifically binds only to hydrogen.
The RF pulse makes them (only the one or two extra unmatched protons per million) spin at a specific frequency, in a specific direction.