From: martinm (martinm@SoftHome.net)
Date: 07/31/02-11:05:04 AM Z
I wonder whether a UV laser source (HeCd, DPSS) would be an alternative.
Compared with a 2000 W metal halide lamp, its few milliwatts of power will
seem very weak. But keep in mind
this will be very narrow bandwidth light. Though I ignore how much UV power
at say 350nm is actually delivered by a 2000W metal halide lamp, I have a
feeling laser sources might be interesting...
Martin
> When we talk about Metal Halide Lamps, we should mention the kind of
Metal.
> A gallium Lamp will not have the same exposure time as an Iron lamp. You
can see the difference in spectrum for example by choosing the link MH-Lamps
on http://www.sadechaf.be/sadeen/saden6fr.htm
> With the iron based processes, we need the maximum of power approximately
between 350 and 400 nm if I remember correctly, because the sensitivity peak
of iron salts like AFO or citrate is there.
> The iron based lamp seems very good for that but the gallium based lamp
will probably request hours of exposure time.
> We have to choose the right UV. Easy to remember: Iron process = Iron MH
lamp. (I think I'll buy one, test and let you know)
> For dichromated colloids like gum or gelatin, I don't know where is the
sensitivity peak in wavelength, any idea ?
>
> Philippe
> Belgium
>
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