etreff: Re: [time-nuts] What is the BEST crystal?
Interferogram showing vibration nodes etc for quartz ring resonator frequency
standard attached.
Bruce
> On 01 March 2020 at 14:27 Bob kb8tq wrote:
>
>
> Hi
>
> It’s also the size of the 2.5 MHz 5th’s and similar parts m
Dana
The text merely indicates that Tolansky and Bardsley obtained these images in
1948.
The annular crystal was one of the NPL frequency standards of the time.
However, given that the fringes are multiple beam fringes, a high reflectivity
electrode must lie on the top surface of the ring.
Bruce, is there any text about the ring resonator which discusses the
features in the
interferogram? Also I'd be interested in the configuration of the
electrodes.
My present interpretation is that the vibratory resonance stems from
contra-rotating
modes each propagating around the ring, and
Interferogram showing vibration nodes etc for quartz ring resonator frequency
standard attached.
Bruce
> On 01 March 2020 at 14:27 Bob kb8tq wrote:
>
>
> Hi
>
> It’s also the size of the 2.5 MHz 5th’s and similar parts made “way back”.
> They went into glass packages
> the size of door
Hi
It’s also the size of the 2.5 MHz 5th’s and similar parts made “way back”. They
went into glass packages
the size of door knobs. Packaging / design / mounting / processing has changed
a lot since then.
Bob
> On Feb 29, 2020, at 7:41 PM, John Moran, Scawby Design
> wrote:
>
> Wow, that
IIRC Tolansky obtained some interferograms illustrating the surface deflections
of these acoustic resonators.
I'll unearth my copy of Tolansky's book on optical interferometry and check.
Bruce
> On 01 March 2020 at 13:41 "John Moran, Scawby Design"
> wrote:
>
>
> Wow, that provoked an
Wow, that provoked an interesting discussion!
Thanks for all the information and references to further information - it
should keep me quiet for a while.
Interestingly 50mm diameter was about the diameter of the crystals used by the
British Post Office in the early days for generating a master
