Encyclopedia > Cesium standard

  Article Content

Cesium standard

In telecommunication, a cesium standard is a primary frequency standard in which electronic transitions[?] between the two hyperfine[?] ground states of cesium-133 atoms is used to control the output frequency.

Note : The energy level between the two hyperfine ground states corresponds, in the absence of external influences (e.g. , the Earth's magnetic field), to a frequency of 9,192,631,770 Hz.

Source: from Federal Standard 1037C and from MIL-STD-188



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Digital Rights Management

... by copyright holders to be unacceptable. See Professor Edward Felten's freedom-to-tinker Web site for information and pointers. An early example of a DRM system is the ...

 
 
 
This page was created in 23 ms