[time-nuts] Cesium vs H Maser clocks
hmurray at megapathdsl.net
Wed Dec 3 08:59:13 UTC 2008
> Someone asked what a frequency time standard cam calibrate besides a
> clock. Gravity is, or was, measured by throwing a corner cube into the
> air (vacuum) and using a laser interferometer, timing its
> acceleration as it fell back. All of that can be calibrated from a
> frequency standard, so unlike volts and things gravity is one
> variable that frequency/time can be used to define. Although I dont
> think you will find a frequency/gravity transducer on fleabay.
My head hurts. What does relativity do to a laser interferometer?
Clocks are already good enough that they need to correct for
elevation/gravity. Is this getting circular?
In case anybody hasn't read it recently...
Time Too Good to Be True, Daniel Kleppner
Physics Today, March 2006, page 10
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