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Re: [ATM] Phase contrast and the 10 incher.

> I disagree.  The overall  "donut" from testing at COC is about one
> wave of error.  These worm tracks are much more subtle.  I ran a quick
> simulation where I took a perfect wavefront, and lowered a rectangle
> of the surface (about the size of one of the worm tracks) by 1/100
> wave.  It was easily visible in a simulated Foucault image, and at
> about the same intensity as in Dale's Foucault image.  This size of
> defect would not be visible as perceptible bending in the
> interferogram fringes.

Of course, you are right. It's the slope you see with Foucault, not the
depth. It's time to pick up some practise again, if onlyI had a concrete
floor...

   Arjan

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