Re: [ATM] ATM Digest, Vol 30, Issue 21

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

Wolfgang,

> you can help me:
> In Germany we had a mirror testing project. 16 persons were testing one
> astigmatic mirror
> and the main problem was the support of that astigmatic mirror. The problem
> is, how we
> cause any kind of astigmatism by the support. You can subtract the induced
> astigmatism
> if you can calculate the amount of it. And therefore we need a program
> similar like Plop
> but to calculate the lateral pressure on a mirror. Is there anybody who can
> help?

This seems to directly pertain to my recent post to the interferometry
group, where I describe a new (to me) algorithm for separating mirror
from test stand aberrations from Zernike coefficients from the mirror
at various angles of rotation.  My current algorithm works with an
arbitrary amount of rotational data, but can use as few as two
rotations.  The rotation angles are arbitrary, although some
combinations are not very useful (e.g., rotation of 0 degrees or 180
degrees).

I think it would difficult to calculate test stand aberrations from
simulation in a reliable way.  It's much better just to measure it.
-- 
Steve Koehler
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