Re: [ATM] Thermal mirror deformation -fan on both sides

[Ric Rokosz <radicell2@yahoo.com>]

--- Jan van Gastel <jhm.vangastel@wanadoo.nl> wrote:


> >
> > Inspired by the recent thread on under/over
> correction of a mirror due to
> > radiative cooling, I have done some simulations
> with a PDE solver and
> > written an article about it. Please have a look at
> >
>
http://home.hetnet.nl/~artm/atm/articles/cooling.html
> > Iwould very much appreciate any comments: there
> might be wrong assumptions
> > or errors.

I'm somewhat surprised more comments haven't been
advanced on this specific example of the effects of
mirror cooling,especially the fact that using a fan on
just the backside of the mirror induces more
distortion than no fan at all!Kinda sets a new
standard for atm's that pro's knew about for quite a
while.

The best solution is to use a fan on both sides.This
reminds me of the work done by a French optician that
used a heater wires around the circumference of the
mirror to both equalize the mirror temp in the blank
and to distort the mirror's shape to an aspheric
shape.

Thanks Jan for this important work.

Ric

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