[ATM] [interferometry] Igram

[Berthold Hamburger]

I would like to add from a Interferometry newbie perspective that I was
astonished how "easy" it is to get started in that method of testing optics.
I had always imagined IF as something out of the league of the amateur. It
really adds another dimension to understanding the shape of the glass you
are working on and it allowed even an Interferometrical infant like me to
use the analysis provided by Dale's openfringe to apply the exact polishing
the mirror needed. It takes out much of the guesswork from judging mirror
shape and many issues that repeatedly pop up on the list simply would not
exist if people had more access to that type of analysis.

Together with Ronchi and Focault it is something every mirror maker should
have in its toolbox.

I would like to thank again Vladimir and Dale for their tutoring and for
sharing their wisdom so generously!

Berthold

-- 
Berthold Hamburger - Cellist/Spain
Email: behambu at artinso.com
http://www.artinso.com
http://www.astro.artinso.com


> -----Original Message-----
> From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf
> Of Vladimir Galogaza
> Sent: sábado, 10 de octubre de 2009 12:23
> To: interferometry at yahoogroups.com
> Cc: ATM List; atm_free at yahoogroups.com
> Subject: Re: [ATM] [interferometry] Igram
> 
> Wayne,
> 
> >Question, what tool are you using to do this analysis?
>  ( Intensity profile of interferogram at one diameter)
> 
> I was using (in chronological order):
> 
> 1)  Advice to all ATM from Michael Peck to try (free) "R" programming
> language
>       where to find it and how to download it.
> 
> 2) Extensive tutoring in "R" language by Stephen Koehler ,I am much
> indebted for.
> 
> 3) which enabled me to write small "R" program for this purpose. Just
> couple of lines,
>     which sometimes reveals  some interferogram characteristics better
> than
>     visual perception.
> 
> Wealth of what Stephen and Michael already have in their "R" program
> treasure boxes, highly related to what ATM should be interested in, is
> still to be discovered by most of gents on the lists.
> Why it is still not exploited is similar puzzle to me as why the Bath
> interferometer
> was forgotten since published in 1973 and used practically only  by
> Wolfgang Rohr.
> It has to wait 20 years to be revived by David Rowe and his pioneering
> fringe tracing
> program. Since then Dale Eason provided famous OpenFringe and Michael
> Peck
> his PSI analysis program. All mentioned programs are free, authors
> alive, well
> and willing to help. Small but potent number of ATM decided to give them
> a chance and what they achieved is proof that interferometry for ATM is
> not exotic extravaganza but mature testing method.
> 
> Regards
> Vladimir
> 
> 
> 
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