An atomic clock uses a transition between atomic energy levels as a reference frequency. In a clock, an oscillator is compared with that reference and adjusted or evaluated to keep time.
Precision and traceability
Atomic-clock performance depends on the atoms, interrogation method, environment, and frequency-comparison chain. Comparing clocks or using one as a reference requires accounting for systematic effects and uncertainty; the word “atomic” does not mean an instrument is error-free.
Role in a measurement system
A stable clock can help timestamp observations or provide a frequency reference. It does not measure every part of an experiment: sensors, digitizers, synchronization links, and analysis software each need their own characterization.
The Project S.P.H.E.R.E. proposal discusses timing as one part of a possible measurement chain. It does not report installed clocks or completed synchronized measurements.
Frequently asked questions
What makes an atomic clock an atomic clock?
It uses a frequency associated with an atomic transition as a reference for stabilizing or measuring an oscillator.
Can an atomic clock verify a mechanical resonance measurement by itself?
No. A clock can provide a timing or frequency reference, but the mechanical measurement still needs its own calibrated sensors, model, and uncertainty evaluation.
Revision history
- — Initial publication; no separate revision note supplied.