View source for Time metrology

{{Short description|Science of measurement in time keeping}}
{{merge with|Chronometry|date=August 2023}}
'''Time metrology''' or '''time and frequency metrology''' is the application of [[metrology]] for [[time]] keeping, including [[frequency stability]].<ref name="Arias pp. 2289–2305">{{cite journal | last=Arias | first=Elisa Felicitas | title=The metrology of time | journal=Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | publisher=The Royal Society | volume=363 | issue=1834 | date=2005-07-02 | issn=1364-503X | doi=10.1098/rsta.2005.1633 | pages=2289–2305| pmid=16147510 | bibcode=2005RSPTA.363.2289A | s2cid=20446647 }}</ref><ref name="Levine 1999 pp. 2567–2596">{{cite journal | last=Levine | first=Judah | title=Introduction to time and frequency metrology | journal=Review of Scientific Instruments | publisher=AIP Publishing | volume=70 | issue=6 | year=1999 | issn=0034-6748 | doi=10.1063/1.1149844 | pages=2567–2596| bibcode=1999RScI...70.2567L }}</ref>
Its main tasks are the realization of the [[second]] as the [[SI]] [[unit of measurement]] for time and the establishment of [[time standards]] and [[frequency standards]] as well as their [[time transfer|dissemination]].<ref name="BIPM">{{cite web | title=time and frequency | website=BIPM | url=https://www.bipm.org/metrology/time-frequency/ | access-date=2021-01-26}}</ref>

==Time transfer==
{{excerpt|Time transfer}}

==See also==
{{Main|Outline of metrology and measurement}}
*[[Allan variance]]
*[[Atomic clock]]
*[[Chronometry]]
*[[Clock drift]]
*[[Coordinated Universal Time]]
*[[Frequency drift]]
*[[History of timekeeping devices]]
*[[Horology]]
*[[International Bureau of Weights and Measures]]
*[[International Earth Rotation and Reference Systems Service]]
*[[Time and Frequency Standards Laboratory]]
*[[Time deviation]]

==References==
{{reflist}}

==Further reading==
* {{citation | title=IEEE Guide for Measurement of Environmental Sensitivities of Standard Frequency Generators (Revision of IEEE Std 1193 - 1994) | publisher=IEEE | publication-place=Piscataway, NJ, USA | isbn=0-7381-3711-1 | doi=10.1109/ieeestd.2004.94440 | ref={{sfnref | IEEE}}}}
* {{citation | title=IEEE Standard Definitions of Physical Quantities for Fundamental Frequency and Time Metrology—Random Instabilities | publisher=IEEE | publication-place=Piscataway, NJ, USA | isbn=978-0-7381-6855-5 | doi=10.1109/ieeestd.2008.4797525 | ref={{sfnref | IEEE}}}}

[[Category:Time]]
[[Category:Frequency]]
[[Category:Metrology]]


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