Learning and doing.
Construction is moving along. Here are a few updated pictures:
| From Laser Projector |
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| From Laser Projector |
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| From Laser Projector |
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| From Laser Projector |
So now I’m in the process of making the electronics for this project, the laser strength adjustment so the white light is white, and lastly the alignment. Hopefully not too much longer now. If only I wasn’t in school…
The idea came to me when I saw that microvision was coming out with some pico laser projectors that had some neat properties. First it was tiny and portable, second there were no lenses needed since it was a laser display and laser light doesn’t diffuse out as much as… well… diffuse light. Lastly and most importantly the aspect ratio could be changed indefinitely with the wall to be projected on. This means you could place the projector basically at 90o to the wall you want to project on! COOL! So I decieded I’d have to make one, the simplest way I could think of was to use RGB combined lasers and shine them through an LCD screen. Here are my first attempts:
That video shows the dismantling of the LCD screen and the first test of unfocused laser light as a transmitting light source. It seems to work.
I’m also using some Dichroic Mirrors / Beamsplitters from Thor labs to mix my red, green, and blue lasers to make white laser light. This will enable me to output full color laser video. The way the dichroic filter works is by selective reflection, this will allow laser mixing in the following manner:
I bought multiple mirrors, each one selectively reflects a narrow band of light. So when I want to combine red and blue I would use a cyan subtractive filter aim the red through it, but have the blue bounce off at the same angle the red went through. This will have the effect of spectral laser combining and the resulting laser light will not be coherent. For more methods of laser combination and an explanation check out The Encyclopedia of Laser Physics.
Here’s the album of photos that i have of this project… So far:
During the silk screening class I teach last week I brought in my experimental burnout ink.
We attempted to burn out several different fabric and fiber types. Here are a few tips we picked up:
For many more pictures and some photo’s of the process check my picasa album.
-instructable soon
Bilal
A gift came in the mail today, I’m the proud parent of two new bags of cocaine looking powders: Guar Gum and Sodium Metabisulfate. These two chemical compounds carry some heavy weight and should be extremely handy for my next project. Burnout Ink Flamethower Tee Shirt! The shirt may or may not throw flames, but the idea takes the combined properties of the two chemicals I bought to selectively eat a shirt to create sheer transparent layering effects.
The Sodium Metabisulfate, which I’ll call the shirt eater, is a chemical commonly used in tree stump removal. You pour some on and it eats the organic fibers that compose the tree and you now have a boring lawn. But what this also means is that the cotton parts of a shirt might be eaten leaving the non-organic parts (the polyester).
Awesome, now we need a carrier. Let’s bring in contestant #2! Gaur Gum!
So now we have the active ingredient in our burnout ink we need something to transport it. Guar Gum is pretty neat stuff, it’s edible… actually it’s used as a binder in some medicines and it’s pretty non-reactive. This derivative of a bean is a perfect thickener, it’s a part of toothpaste and shampoo conditioner. It does not gel on it’s own, so wikipedia suggests borax, I’d like to see what kind of gel it turns into (perhaps this has a use in some casting applications as well?)
Soon we’ll give this a shot and a new design will be up at modati’s hack line of shirts. Home burnt shirts homeboys.
Yo
-BG
.jpg "Destroy the net")
Help me ruin the internet by creating the worst webpage in the history of the web. I’m calling it Webshite. I’ve been coming up with a list of ways we’ve taken a great idea like the internet and corrupted it along the way: disabling right clicking, and animated mouse cursors come to mind… I’d like your help! Go to ruintheweb.com and add your demented rubbish to the list!
Try to be creative because I will take your suggestions and turn ruintheweb.com into Webshite, the worlds most foul webpage.