Re: ATM Getting and keeping big glass at ambient

["Benoit Schillings" <benoit@be.com>]

degradation is caused my thermal boundaries on the optics, what can be 
done
>to the eliminate these effects on conventional mirrors to the highest 
level
>possible?
>


Funny you talk about that... I was planning to ask a few similar questions 
last night !

One idea would be to have a very slow fan ABOVE the mirror to blow away 
the
very thin layer of warmer air on the mirror...


>Obviously, fans behind mirrors have been utilized for years to help large
>glass to cool quicker... How far can this idea be taken? Can a big fan 
get
>you to equalibrium faster, and keep you there better? How about a really 
BIG
>fan, how about three BIG fans? Is there a point where there is no further 
gain?
>


How about some Peltier elements on the back...  

How about water cooling, it would not be that difficult to have a water 
tight
box siliconed on the back of the mirror... you could then circulate water 
against
the mirror, probably the fastest way to remove heat.



                -- Benoit