This is true for a point source, but most sheet exposures are defined in
watts per square centimeter or something similar.
I interpreted Per's question to be about spectral measurements - in
terms of power at a particular wavelength. He's concerned about exposing
and curing UV sensitive media and making sure he has adequate exposure.
On 1/26/2012 9:19 AM, Malcolm Parker-Lisberg wrote:
>
>
> Per
>
> UV intensity is measured in Watts per Steradian, see:
>
> <http://books.google.co.uk/books?id=vu7OU2EWKPoC&pg=PA41&lpg=PA41&dq=steradian+UV&source=bl&ots=pcRnx7NrDI&sig=9v-0af4GfWVN2e-AoUxkJrYQlzQ&hl=en&sa=X&ei=xm4hT9mcNc3Msgb_kMGDCA&sqi=2&ved=0CCEQ6AEwAA#v=onepage&q=steradian%20UV&f=false
> <http://books.google.co.uk/books?id=vu7OU2EWKPoC&pg=PA41&lpg=PA41&dq=steradian+UV&source=bl&ots=pcRnx7NrDI&sig=9v-0af4GfWVN2e-AoUxkJrYQlzQ&hl=en&sa=X&ei=xm4hT9mcNc3Msgb_kMGDCA&sqi=2&ved=0CCEQ6AEwAA#v=onepage&q=steradian%20UV&f=false>>
>
> Malcolm
>
> I don't suffer from insanity I enjoy it!
>
> ________________________________
> From: Per Mattsson <per@... <mailto:per%40permattsson.se>>
> To: Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>
> Cc: Per Mattsson <per@... <mailto:per%40permattsson.se>>
> Sent: Monday, January 23, 2012 7:41 AM
> Subject: [Homebrew_PCBs] UV light sources
>
>
>
> 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.
>
> /Per
>
> Per Mattsson - per@... <mailto:per%40permattsson.se> -
> +46706524567
>
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Rich Osman; POB 93167; Southlake, TX 76092 (Near DFW Airport)
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