Re: [ATM] A very rough surface mirror

["Scott Milligan" <starzkey@charter.net>]

Dale:

Two thoughts:

1. Could some of this mess be attributed to an imperfectly stripped coating,
or damage done during a stripping operation?
2. Your hi-rez simulated recovered foucaultgram from interferometric data is
quite simply, an amazing accomplishment!


Scott M.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Dale Eason
Sent: Saturday, October 20, 2007 10:33 PM
To: atm@atmlist.net
Subject: [ATM] A very rough surface mirror

http://home.comcast.net/~doeason/Surface_images.pdf 
1meg file.

This mirror has a surface similar to one that Texereau
shows in his book where he states it was caused by too
much pressure and too fast a stroke by an over
enthusiastic mirror maker.  

This is about the worst surface I have ever measured. 
I am using the PDF file format because there is a lot
of detail in these images and one can zoom in and out
of them easily in that format.  I show real ronchi and
Foucault images and compare them to the
interferometric data.

Would anyone care to speculate on the cause of this
surface?  The mirror is an 8 molded Pyrex blank.  The
the words "Pyrex made in the USA"  and "8D" molded
into the back.  The sides are slightly tapered to
allow it to be removed from the mold. It was once
aluminum coated but nearly all of it has gone.


Dale Eason

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