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A calibrated UV light meter would be an interesting tool to verify you exposure box has consistent light across the surface and possibly to adjust the exposure time. Not sure the ML8511 sensor is the best choice of the job. Looking at the spectral response chart it response falls off rapidly between 370nm and 400nm and seems to drop 80%. This is the smack in the area of what most photo resists like to see. UV LED's emit it the 395 to 410 range, not sure about FL tubes. So calibration would be an issue but it could be used for relative measurements.
Craig
---In homebrew_pcbs@yahoogroups.com, <alienrelics@...> wrote:Discussions of the need for a UVA Dosimeter are on topic.
Discussion of the design are not. Electronics_101 is an excellent place for that.
http://groups.yahoo.com/group/Electronics_101
Steve Greenfield AE7HD
moderator of both groups--- In Homebrew_PCBs@yahoogroups.com, william casselberry <wcasse@...> wrote:
>
> If design and code was available, would you build one? What
> features should it have?
> Â
> Uses
> ∗ Check your safe light
> ∗ Check your light box
> ∗ Check your photoresist
>
> ∗ Share results with group
> ∗ Consistent results regardless of light source
> ∗ Use the sun
>
> Â
> Design ideas
> ∗ Battery powered
> ∗ Thin sensor at end of FFC (fit under glass)
> ∗ Display can be pointed in any direction
> ∗ Display dose in mJ/cm^2As for the photodiode, I thought that the ML8511 would
> work well. It outputs 1.0v at 0 mW/cm^2 (no UV light) with constant slope to
> 2.8v at 15 mW/cm^2 (lots of UV light).
>