Re: [ATM] Banishing the diagonal

[artbianconi@blast.net]

Hi Jerry,

You are right of course. I completely forgot the heat factor and, 
that consideration is not likely to go away unless there's a 
major breakthrough in technology.

My memory (which is subject) is that the performance of even the 
best of IR sensors improves substantially as the temps drop. That 
suggests that even with a breakthrough in resolution and cost, 
CCD elements will still get better when their temps are cooled. 
That suggests that any CCD we see in such an application will 
still have some means of cooling it.

It's not likely I'll be the one to try it. NASA likely has the 
financial resources for such things at their current prices.

Thanks for responding

Art Bianconi

From:           	"Jerry B. Hillman" <JBHillman@ev1.net>
To:             	<artbianconi@blast.net>, <atm@atmlist.net>
Subject:        	Re: [ATM] Banishing the diagonal
Date sent:      	Thu, 26 Aug 2004 06:46:33 -0500

Hi Art,
I think that the problem with placing a ccd into the light path 
to replace the secondary is going to hinge on controlling the 
heat generated.  Those things get HOT.  Imagine putting that into 
the light path.  Should do interesting things to the image, and 
the cooling equipment used now would occupy more space than the
typical diagonal does. Or maybe not. Why don't you try it and let
us know? Clear skies, Jerry




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