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dominicbeesley wrote:Hi Harry,
looks promising. Have you tried blue or even better ultra-violet LEDs many phosphoresent things are worked by ultra-violet light and this would give the possibility (with suitable filtering to protect people's eyes) of an "invisible" scanning beam
Dom
Marcus wrote:Thats pretty cool,
I remember I got some chalk given to me that was phosphorescent...
A quick ebay-ing turned this up that might be interesting to paint a surface with?
http://cgi.ebay.com.au/Glow-In-the-dark ... tsupported
Klaas Robers wrote:UV-LEDs are not that easy to get. But for phosporisation blue LEDs are just as suitable. The screen then may phosphorise green. Then use a pair of spectacles with yellow glass in it and you wouldn't see the blue scanning spot. This is the same as the old P7 picture tubes that we used for SSTV. A bright blue scanning spot and a green afterglow of the screen.
johnrpm wrote:flourocein (not sure of the spelling) is used to attenuate lasers, the light penetrates according to brightness, this could be used to give 3d effect if viewed at an angle, maybe a depthmap projection into sealed tank, imagine a face with the nose brightest .
johnrpm wrote:Hello Harry,
I might make a thin box to hold the flourocein and put it in front of my televisor just to see what happens.the stuff I have is powder, and added to water, they use it to find leaks, trace water courses and eye surgery, so its safe to use, it fluoresces when lit with white light but better with uv. I spent some time building a cnc painting machine, and now building an orrery, played around with tesla coils and high voltage stuff, to many interesting things to make but never enough time.
all the best
john
johnrpm wrote:I suppose the afterglow time must match the scan speed, the flourocein is pretty fast, this may be interesting.
https://hackaday.com/2011/01/18/phospho ... -painting/
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