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Frequency and time standards
Article By:
Henderson, Dale Centre for Metrology, National Physical Laboratory, Teddington, Middlesex, United Kingdom.
Last reviewed:2000
DOI:https://doi.org/10.1036/1097-8542.YB000660
Frequency is the most accurately measured physical quantity. It is used to measure the time intervals from which time scales are generated. Accuracy is important in navigation, communications, space exploration, and scientific research, particularly in relativity. Recent developments in physics and communications have brought about advances in the accuracy of frequency measurement and in the accessibility of time scales.
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