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The measurement of time durations or instants of ocurrence of events has beenfrequently modelled ``operationally'' by coupling the system of interest to a``clock''. According to several of these models the operational approach islimited at low energies because the perturbation of the clock does not allow toreproduce accurately the corresponding ideal time quantity, defined for thesystem in isolation. We show that, for a time-of-flight measurement model thatcan be set to measure dwell or arrival times, these limitations may be overcomeby extending the range of energies where the clock works properly using pulsedcouplings rather than continuous ones.Comment: 1 eps figur

Quantum time-of-flight measurements: Kicked clock versus continuous clock