[time-nuts] Sensitivity to g in atomic clocks

[Brooke Clarke]

Hi Antonio:

Atomic clocks don't have a sensitivity to the direction of the 
acceleration like a crystal.  That's to say a crystal has "planes" and 
the direction of the acceleration changes the crystal frequency.  See 
the plot at:
http://www.prc68.com/I/PRS10.shtml#Accel
The PRS10 was rotated so different faces were sitting on the bench and 
the Electronic Frequency Control signal to the crystal oscillator were 
plotted, see:
http://www.prc68.com/I/Images/FC_ROT.jpg

But atomic frequency standards have a sensitivity to the magnitude of 
the gravitational field they are in.  See:
Project GREAT: General Relativity Einstein/Essen Anniversary Test
Clocks, Kids, and General Relativity on Mt Rainier
http://www.leapsecond.com/great2005/

Have Fun,

Brooke Clarke
http://www.PRC68.com


iovane at inwind.it wrote:
> While sensitivity to g is an usually specified parameter for crystal
> oscillators, I've been unable to find any indications for atomic clocks, say
> 5071A, or more modestly LPRO. Can anybody point me to any source of info on the
> subject?
> Thanks,
> Antonio I8IOV
>
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