Re: [ATM] Ultrathin mirror support study

[Stephen Koehler <s.c.koehler@gmail.com>]

Mike,

> Does anyone else have trouble getting these animations to animate?
> Pressing the "Start" button just repeatedly loads the pictures
> without ever displaying them. I can step through them in sequence though.

I'm sorry it's not animating correctly for you.  It appears that
browsers check on every image from updates, so if communication
between your site and visi is slow, the animation gets behind.  A
workaround I put in for Vladimir G. is to use the step button
repeatedly.  Some day I will figure out how to get JavaScript to
preload the images and work from the cache.

> Of course the idea of separating out "test stand" effects rests on
> the assumption that the mirror responds to gravity the same as it's
> rotated. Obviously that's not the case here. You still might get a
> more or less accurate picture of the mirror's figure by averaging
> derotated interferograms if you assume the mirror flops around in a
> completely random fashion as you rotate it.

Actually, Dale just sent me the set of images he took with the mirror
vertical.  It is much better behaved with regard to test stand
effects.  I'm still processing the data, but I'm confident I can
determine how much astigmatism is on the glass.  I should also be able
to subtract the mirror aberrations from the original set of 16 in
Dale's cell to show exactly what the cell is doing to the mirror on
each placement.

--
Steve Koehler
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