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Atomic clock
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"Clock"
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112
"Clock"
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toc
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112
wiki
Video 3
. How an atomic clock works, and its use in the global positioning system (GPS) by
EngineerGuy
(2012)
Source
. Shows how conceptually an atomic clock is based on a
feedback loop
of two
hyperfine structure
states of
caesium
atoms (non-
radioactive
caesium-133
as clarified by the
Wikipedia
page). Like a
quartz clock
, it also relies on the
piezoelectricity
of quartz, but unlike the
quartz clock
, the
quartz
is not shaped like a
tuning fork
, and has a much larger ressonating frequency of about 7
MHz
. The feedback is completed by producing
photons
that
resonate
at the right frequency to excite the
caesium
.
Table of contents
112
Caesium standard (1967)
link
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"Atomic clock"
28
Ancestors
Clock
Time
International System of Units
System of units
Physics
Natural science
Science
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Caesium standard