[time-nuts] Time Dilation tinkering
kb8tq at n1k.org
Wed Mar 22 17:54:33 EDT 2017
The outer can is at best only “sort of” sealed.
> On Mar 22, 2017, at 10:58 AM, jimlux <jimlux at earthlink.net> wrote:
> On 3/22/17 4:28 AM, Bob Camp wrote:
>> In this case, the vacuum might work against you. You change the pressure outside
>> the package and you get a flex. Flex translates to dimensional changes. That gives you
>> a frequency shift. People make absolute pressure sensors this way :) Rb’s are by no
>> means the only frequency standard impacted by this effect. Precision OCXO’s have the
>> same issue.
>> If you had enough room inside the package, you could do a “can in a can” sort of approach.
>> The outer vacuum sealed can flexes. The inner vacuum sealed can does not see anything.
>> You don’t eliminate the sensitivity this way, you do attenuate it quite a bit with each layer.
>> The question then becomes - is is worth the increase in size? Since the pressure sensitivity
>> is well below many other environmental factors …. probably not.
> The CSAC is a can within a can (or more properly, the physics package is inside a sealed can) but I don't know if there's vacuum inside the can.
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