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Robonz wrote:Good stuff Harry,
I think it might work better than i thought. A couple of ideas for you while you are in Dalek science mode.
If you wanted an IR laser, those laser printer polygon mirrors normally have an IR laser in the mechanism. Did you try the UV laser to see if it could engergise the heat sensitive paint?
To quench you could simply try a ducted fan to blow and cool down the heated area.
Cheers
Keith
Robonz wrote:Hi Harry
Yes, IR lasers are very dangerous. Anyway I have been doing some research which I will share with you.
Your heat sensitive paint is called "Thermochromic Pigment" and can easily be purchased as a powder for shipping reasons. There is plenty for sale on ebay and it swithes at 31 degrees c. This means a UV or blue laser of 1/2 a watt would change the colour pretty fast in my opinion. So long as your drum does not suck the heat out too quick.
Re: Heat sensitive paint
Unread postby OmegaProductions » Tue Nov 21, 2017 2:40 am
WOW! Now that's what I call impressive work!
That's a great idea Harry! I wonder what it could be used for displaying SSTV pictures, but anyways...I hope you enjoy doing this project Harry!
Panrock wrote:Hi Harry,
As others have said, infra-red can be very dangerous.
One brief mistake when your concentration lapses and your eyesight can be damaged for life.
I prepared this safety guide for my workshop when I was experimenting with infrared broadcasting a while back. It doesn't pretend to be the last word but you might find it helpful. I used an infrared-sensitive security camera to check what was going on. You can get safety goggles from China.
http://www.radiocraft.co.uk/opto.htm#in ... afetySteve O
Harry Dalek wrote: makes me wonder if it could see the out line of my hot soldering iron in the dark ? and if so they must be effected by hot days heat off objects...
Panrock wrote:Harry Dalek wrote: makes me wonder if it could see the out line of my hot soldering iron in the dark ? and if so they must be effected by hot days heat off objects...
Guessing a bit here, but I would think not. The reason: at such 'low' temperatures the bulk of the infra-red emissions lie in the longer wavelengths or far infra-red. Your average camera is only sensitive to near infra-red.
Steve O
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