An atomic clock that uses the vibrations of caesium atoms as a time standard.
铯钟（用铯原子摆动作计时标准的原子钟）
Example sentencesExamples
Despite the fact that the ancients had no lasers, artificial satellites, radio telescopes, or cesium clocks, their accounts of eclipses have made it possible to build up a consistent picture of how the length of the day has changed.
Researchers are working to develop clocks as much as 1000 times as accurate as the current world-standard cesium clock.
It is also used in the cesium clock, a device that measures time by means of the wavelength of light given off by one of the elements isotopes, cesium- 133.
The idea behind the atomic clock (or the caesium clock) is to bombard cesium with microwaves of close to 9,192,631,770 cycles per second.
Thus I run an experiment which performs measurements on the cesium clock which gives me a basic calibration upon which all clocks can be run.
These are the nation's three primary clocks, caesium clocks that act as a reference for other atomic clocks around the world.
In a cesium clock, it has been determined that one second is equal to 9,192,631,770 oscillations or transitions.
Since the 1970's (when we developed stable lasers and accurate cesium clocks), we have calculated light speed from laser measurements.