Re: [ATM] 32" Focal ratio

["Don Clement" <clement.focuser@verizon.net>]

> Perhaps I missed it, but I got the impression you are thinking of having
> the camera inside the tube facig up toward the secondary flat.  If so,
> remember that cooling a CCD with Peltier coolers makes waste heat that
> has to go somewhere.  You might not want it in your optical path.

Waste heat may not necessarily be in the optical path  with a  cooled CCD.
If the cooled detector was behind an insulated window  (especially if vacuum
is used as the insulator) and if the waste heat were carried via insulated
plumbing to a heat exchanger outside the optical path then there might not
be a heat issue. Constantan wire is a good material to make electrical
connections to the CCD and associated electronics because constantan is a
good electrical conductor but a relatively poor thermal conductor. Unlike
nichome which is also used for this purpose, constantan can be soldered.



Don Clement

Running Springs, California

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