[time-nuts] Super stable BVA Quartz resonators... BVA??
Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sat Dec 8 04:48:19 EST 2007
Hal Murray wrote:
> BNeubig at t-online.de said:
>
>
>> The key points which yield the BVA's improved aging are, that - the
>> whole resonator package is made from quartz, consisting of the
>> resonationg quartz plate in the middle section and the two mounting &
>> sealing plaates on top and bottem - you may call it a Hamburger style
>> ;-) - the resonating plate is held through quartz bridges rather than
>> metal suspensions, thus reducing mounting stress.
>>
>
> Neat. Thanks.
>
> Why is the top domed? I assume flat would be easier to manufacture.
>
> Why is it not symmetrical? If the top is domed, why not the bottom too?
>
>
>
>
One surface is convex to facilitate suppression of unwanted harmonics.
Its actually quicker and easier to make a planoconvex "lens" than a
biconvex one.
Bruce
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