From: Tox Gunn (tox@remarque.org)
Date: 12/11/01-12:17:58 PM Z
Hazy memory suggests a "heat mirror" exists - a sheet
of optical glass coated to reflect IR and pass other
wavelengths. If this exists and has a high enough UV
transmissivity, you could put it in the light path at
a 45 degree angle to the axis of projection and reflect
the IR off to a heat sink.
Good luck, and let us know how things progress - I've
been tempted to play stereolithography games with
dichromated gelatin, and will need a good UV source..;)
Tox
> I am certain that heat is going to be the major issue. I need to
> find out is how it is dealt with.. How would you cool the film to make a
> exposure with out vibrating the film with a blower... I also need to know
> if the lens acts as a extra thick UV filter which also may absorb infrared
> heat with the possibility of cracking the lens.....
> I have various high output exposure lamps and power supplies, used for
> silk screen making in 3000 and 5000 watts, .. along with a pulsed xenon
> box with 6 light tubes at 10,000 watts.. I would like to hang one of these
> on a huge old vertical 8x10 enlarger...I had checked out the Fresson site
> so obviously something like this is being done...JC
>
>
> ----- Original Message -----
> From: "Luc Novovitch" <luc@overland.net>
> To: <alt-photo-process-l@skyway.usask.ca>
> Sent: Monday, December 10, 2001 4:23 PM
> Subject: Re: Ultraviolet projection
>
>
> > >I think the major concern would be cooling the film. Even a tiny
> > fraction of 10 thousand watts converted to heat will melt your film very
> >
> > Check out http://www.atelier-fresson.com/technics.htm which should give
> > you an indication of what's possible if you know what you're talking
> > about, and have the means to do it.
> >
> > /ln
> > --
> > mailto:luc@overland.net
> > http://www.sotolgallery.com
> >
> >
>
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