Re: [ATM] Re: FigureXP and Foucault test Analysis

["Jan van Gastel" <jhm.vangastel@wanadoo.nl>]

Andreas,

In both programs I choose Nils Olof Carlin's mask. All settings were exactly
the same.


Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/

----- Original Message ----- 
From: "Andreas Reifke" <andreas.reifke@web.de>
To: <atm@atmlist.net>
Sent: Wednesday, March 30, 2005 10:12 PM
Subject: [ATM] Re: FigureXP and Foucault test Analysis


> Hi Jan,
>
> >> I have used two programs to evaluate the foucault readings of the 12
inch
> >> f/5 mirror I am making: FigureXP and Foucault Test Analysis. The last
> >> program consistently evaluates the quality lower. Where, for instance,
> >> figure XP calculates a P-V wavefront error of 1/6.32 lambda, FTA
calculates
> >> a wavefront error of 1/4.28 lambda. Does someone know the cause of the
> >> difference and which program is correct?
>
> one explanation for the difference could be that both programs are using
different methods for calculating the effective zone radius.
> FigureXP uses Nils Olof-Carlin's method. In Foucault-Test-Analysis the
default setting for calculating the effective zone radius is
> the "traditional" method suggested by Texereau. But you can choose between
the following methods in FTA:
>
> - Texereau
> - Nils Olof Carlin
> - Couder
>
> If you choose "Effective Zone Radius ==> Nils Olof Carlin" on the first
window "mirror setup" you should obtain nearly the same
> results for your mirror as in FigureXP. If that doesn't help: Can you
e-mail me your mirror-file, please ?
>
> Regards,
>
> Andreas Reifke
> www.foucault-test-analysis.de
>
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