Hello,
UV light wavelength is measured in nanometers, Nm, i.e. one billionth of one meter, the amplitude [intensity] is measured in milliwatts per square centimeter per second, or millijoules per square centimeter[i.e. energy received per square cm per second]
The UV spectrum is between 100 and 400 Nm it is broken down into 3 sections UV-A UV-B and UV-C, UV-C is what we use to expose photosensetive materials, [the closer to 400 the better] UV-A and UV-B are used in medical and germicidal applications [very dangerous] UV-C is also dangerous especially regarding the eyes, best not to look at the light source for too long!
400 Nm is also getting very close to the visible light spectrum.
hope this helps
--- In Homebrew_PCBs@yahoogroups.com, Per Mattsson <per@...> wrote:
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> Hi guys!
>
> How can one measure the wavelengths, either a graph over the spectrum or certain wavelengths of a UV-source?
> What unit would one use - Watt, Joule?
>
> I have a few colormeters but those are for human visible light intended for graphics industry. We use candela, cd, or lux for intensity there.
>
> I've found this: http://www.oceanoptics.com/products/usb4000uvvis.asp
> "Priced from $3,061" Ouch ....
>
> Next question, what wavelengths are of interest here - different wavelengths for different materials I suppose?
> 300nm?
>
> I'm currently curing UV-inked paper with two 160W disco Blacklights but I'm shure I could do it more efficient with other sources.
> The paper let the ink go deep into the material so the UV-lights/leds in the printers does not really let the ink solidify.
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> /Per
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> Per Mattsson - per@... - +46706524567
>