[time-nuts] Vibration isolation of quartz oscillators

[Joseph B. Fitzgerald]

If passive vibration isolation is not good enough active dampening is an option with a rig like

https://www.herzan.com/products/active-vibration-control/TS-series.html

I was not directly involved, but a team that I shared a lab with bought a gizmo like that one and it really helped  some very sensitive optical measurements.    It does not take up much room, so it might address the "Space is tight" constraint.   It won't meet a "budget is tight" constraint though.

-Joe Fitzgerald

________________________________________
From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of Poul-Henning Kamp <phk at phk.freebsd.dk>
Sent: Monday, June 29, 2020 2:16 AM
To: Discussion of precise time and frequency measurement; ed breya
Subject: Re: [time-nuts] Vibration isolation of quartz oscillators

--------
ed breya writes:

> The nicest optical bench I've ever seen in person, was in one of our
> labs many years ago. It was a huge, precisely flat polished granite slab
> about 6-8" thick, about 4x8' or maybe 5x10', mounted on active-leveling
> pneumatic bladders. It was loaded with thousands of threaded inserts,
> uniformly spaced on a grid, for mounting optical devices and equipment.

It is worth foot-noting here, that at that level of quality they
are usually not made from natural granite, but rather from
"epoxy-granite", which can be designed to have very low temp-co.

> There are lower-grade type platforms available, commonly called "optical
> breadboards," that are made from thick sheets of aluminum or stainless
> steel, [...]

and these obviously have a sizeable temp-co, so the money you saved on
your bench you get to spend on your air-con.

They are a lot easier to move around though.


--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.

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