Re: [ATM] Fringe XP and flats

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

Phil,

> I've have been playing with FringeXP and OpenFringe to look at the igrams
> for my flats. Both of these programs assume that you are testing against a
> reference flat of known quality to deduce the surface errors in the plate
> under test. In my case, I don't have a reference flat as I am making my flat
> by comparing three plates in pairs – all of unknown quality! The best I can
> do is to tell me the size and shape of the gap between the two plates under
> test. 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

-- 
Steve Koehler
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