On 6/10/22 1:57 PM, Dr. David Kirkby wrote:
On Fri, 10 Jun 2022 at 17:39, Lux, Jim via time-nuts
<[email protected]> wrote:
On the subject of rapid warm up. I suppose if you had a need, one
could
dump as much power as you need into the heater. Turn on oscillator,
lights in room dim for a few moments.
Is that not likely to damage a crystal? Different parts of the crystal
and likely to be at significantly different temperatures at the same
time, putting a lot of stress on the crystal due to a thermal
gradient. It's probably a bit academic, as nobody is going to make an
oven that heats up in fractions of a second, but if one did, I suspect
it might not do the crystal a lot of good. This is only an educated
guess - I don't have anything to back it up.
Oh, it would be disastrous, although quartz is pretty strong, all the
rest of the mounting components might not be.
At the other extreme, would there be any advantage in actually
heating the crystal very slowly, over the course of an hour/day/week,
so the temperature gradient across the crystal is very small? Of
course, if an oven took ages to reach the correct temperature, it
would be inconvenient for most applications, but for some
applications, the advantages might outweigh the disadvantages. Of
course, if one does this, I suspect one would have to cool the crystal
slowly too to prevent a significant thermal gradient across the crystal.
I know it's a bit different, but I have a 600 mm f4 Nikon camera lens.
I was told that Nikon cools the front element over a period of 6
months to reduce stresses in the glass.
Big glass mirrors for telescopes do the same.
Dave
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