Re: [ATM] Fringe XP and flats

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

Phil,

> > Is there some way (is it even possible) to extract the surface shape
> > of each plate given three sets of igrams to work on (AonB, BonC & ConA)?
>
> Yes!  Look up absolute flat testing in Google.  For example, the
> following paper describes such a method.
>
> http://www.veeco.com.cn/pdfs.php/272

I probably should have said more in my first response.  I have
implemented both the Veeco and Ai/Wyant absolute flat algorithms,
using Zernike terms as input.  You might look in my folder Steve
Koehler/Files/Flat Testing in the interferometry group (I see you are
a member there).  When I was fooling around with these algorithms, I
found a number of improvements that make them more robust in the
presence of noise.

If you are interested in pursuing this, I would be happy to get you
set up to run the programs.  You have to install the R language, and
the programs are command-line only.  On the plus side, R produces very
nice graphical output of the results, or you could import Zernikes
back into OpenFringe or FringeXP.

-- 
Steve Koehler
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