Re: ATM "frozen" liquid mirrors

[Aart Olsen <aart@uiuc.edu>]

Typical concrete has a CTE of 5.5X10^-6 per F degree, the same as plate
glass.  Epoxies have CTEs all over the place so it's just a matter of
picking the right one.  If the optical layer is plastic enough and thin
enough it doesn't matter -- this is why paint doesn't fall off, after all.

At 12:15 PM 2/20/97 -0500, ric rokosz wrote:

>I've watched this thread for the past few days,and am really hoping that
>you know that these very high expansion materials are only good for crude
>infrared concentrators.Cement mixed with epoxy does not a optical mirror
>make!
>
>Ric
>Toronto



Aart M. Olsen         mailto:aart@uiuc.edu          217-244-4688
Library Systems Office      Univ of Illinois at Urbana-Champaign