Re: [ATM] Hi resolution interferometry of mirror surface

[Dale Eason <atmpob@yahoo.com>]

Sorry I got the link wrong.  Try this instead.

http://doeason.home.comcast.net/hi_res_3d_surface.jpg

--- Dale Eason <atmpob@yahoo.com> wrote:

> I have been working at getting high resolution
> surface
> data from my home made interferometer and software. 
> I
> thought some might like to see my latest progress. 
>  
> This is of a 6 inch F4 cassegrain mirror of unknown
> origin that Ken Hunter lent me.
> 
> home.comcast.net\~doeason\hi_res_3d_surface.jpg
> 
> The box around the mirror is the 1/4 wave limit. 
> Many
> bumps exceed that.  The very edge and center hole
> surface detail is not real and an artifact of my
> test
> system.
> 
> This was a lot of work to produce but the kind of
> interferometer I used (Bath) is easy to make by most
> ATM's for about $100.
> 
> I could see very little of this surface detail in a
> Foucault image.  I have an 8 inch with some surface
> roughness that does show up in Foucault.  I will try
> that next to see if the detail matches.
> 
> 
> On a different topic.
> Ken loaned me the mirror to see how much it might
> deflect when supported by the middle hole.  The
> mirror
> is 1 inch thick.  I can see no deformation caused by
> self weight from the center support.
> 
> Dale Eason
> 
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