[time-nuts] Vibration isolation of quartz oscillators

[Dana Whitlow]

If compactness is needed and you're operating in anything like a 1 g field,
I think that
it will be impossible to do a spring suspension that is both compact and
effective
down to the milli-Hz level (or less).

It might be worthwhile doing a compensation scheme based on a 3-axis
accelerometer
(one should suffice for multiple oscillators) whose outputs are scaled and
combined
to form a single signal (per oscillator) to be summed into the EFC input.

But some strong caveats immediately come to mind:
1. Noise in the accelerometers' outputs.
2. Dealing with the inevitable tuning nonlinearity of the oscillators.
3. Calibrating the compensation system well enough to satisfy.

Good luck.

Dana


On Sat, Jun 27, 2020 at 7:38 AM Michael Wouters <michaeljwouters at gmail.com>
wrote:

> I have three Oscilloquartz 8607-Bs that I'm rehousing.
>
> In their former life they were part of the frequency synthesis chains
> for H-masers and they hung vertically from a rubber suspension that was
> presumably intended to provide vibration isolation. Unfortunately, the
> person responsible for this has long since retired so is no longer
> around to ask questions of.
>
> In the experiment I will be averaging over  100 s, which suggests to
> me that very low frequencies are what I need to filter out (if at
> all), and I am skeptical that the rubber will do this. Space is tight
> so I am wondering
> whether I should simply ditch the isolation.
>
> What do other people do with their quartzes ? I thought I should ask
> for some advice before attempting measurements.
>
> Cheers
> Michael
>
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