Rick Karlquist wrote:
Tom Duckworth wrote:
The orientation change is due more to the earth's magnetic flux effect on
the oscillator, and less so from gravity.
Tom
Tom Duckworth
[email protected]
Sorry, this is simply incorrect. Magnetic flux from the
earth has no effect on quartz oscillators. There is no
mechanism there. Acceleration definitely affects quartz.
Magnetic flux could have an effect on atomic standards,
but they normally have magnetic shielding to mitigate
this effect. Orientation (or at least acceleration)
can affect cesium beam standards because the atoms
are flying. Len Cutler put in a fix to mitigate against
this in the 5071A CBT. AFAIK, orientation doesn't affect
Rb standards.
Magnetic flux do influence rubidium standards as well, infact they are
more sensitive than cesium. Again, magnetic sheilding is used, but to a
less excessive level than cesium and hydrogen. All atomic clocks do in
their physics depend on the magnetic field, and modern cesium clocks use
nearby sidebands (mf=-1 and mf=+1) which has much higher dependence on
magnetic flux as gears to steer the magnetic flux for the center (mf=0)
pidestal.
However, rubidiums optically pumped gas cells (which is a more accurate
description of what we call "normal" rubidium clocks) has a number of
severe limitations, which makes excess shielding pointless.
A rubidium fontain however... now that is a different matter altogether.
Cheers,
Magnus
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