[ATM] Hi resolution interferometry of mirror surface

[Dale Eason <atmpob@yahoo.com>]

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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