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
Hi Antonio, You may find some information on g-sensitivity of rubidium in old FCS or PTTI papers. There are high-rel rubidium for the military and space applications, so practical issues of acceleration and jerk sensitivity have been well researched. The other thing you could do is quickly and/or very slowly turn over a running LPRO and report what happens. Like what we do with quartz, try it on all three axis. It would be a fun experiment. For a 5071A the frequency shift is gh/c². Earth tides cause a couple of ten cm change during the day; this change in local g affects the output by parts in 10^17; way too low to be detected with a 5071A but getting near to the capabilities of ion clocks. See: http://www.nist.gov/pml/div688/clocks_092810.cfm For some info on g, tides, and clocks see: http://www.leapsecond.com/hsn2006/ To detect changes in g with a 5071A you can raise the clock by many meters. For example, g is about 9.808 m/s² at sea level in Seattle but 1 km up it's closer to 9.805 m/s². A 5071A runs about 1e-13 faster at 1 km elevation compared to one at sea level. This is large enough to be measurable. See: http://www.leapsecond.com/great2005/ /tvb _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
