Re: [ATM] quiet...

[Michael Peck <mpeck1@ix.netcom.com>]

At 13:10 10/29/05, Richard wrote:

>As far as the Hartmann test is concerned, I thought you would
>have the ability to go and try for yourself and make your own
>mind up. I merely pointed out its existance so you could see for

Thanks to Peter Ceravolo having resumed production of reference 
elements I've assembled my own Fizeau interferometer. I've 
successfully done phase shifting interferometry with it. I've done 
the extensive algorithm development needed to process the massive 
amounts of data(*) phase shifting supplies. That entailed digging 
into relatively recent research literature and buying an absurdly 
expensive book so I could learn how to do 2 dimensional phase 
unwrapping. I've even published the software and make it available for free.

Since phase shifting interferometry is generally acknowledged to be 
the gold standard in optical testing the only reason I'd have to try 
Hartmann testing would be to perform a comparative analysis of 
different test methods. I don't feel motivated to do that right now. 
In fact I think my days of cutting out masks are done forever. Of 
course I might change my mind, but performing experiments and 
disseminating data generally doesn't earn you a lot of gratitude from 
the ATM community.

Anyway, thanks for answering my question.

Mike Peck

(*) The largest single data set I've analyzed had about 116K pixels 
in each of 112 frames for a total of ~13 million data points. I've 
presented evidence that features as small as a few centimeters in 
size and ~5nm in amplitude can be detected.



_________________

Michael Peck
email mpeck1@ix.netcom.com
Wildlife photoblog! http://wildlife-pix.com
Amateur telescope making http://home.earthlink.net/~mlpeck54/astro/astro.html 

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