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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Sort of in the same line as laser galvanometers, this is a unit I got off eBay and uses a crystal controlled motor driving a hexagonal mirror. I made it up into a neat unit with a 5mW green laser. The laser needed 3 V and I made a LM317 regulator to run at 3V for it. I took the initial shots then found the laser and regulator were overheating so I added a fan. I then blew the electronics of the mirror drive with an accidental reverse polarity. So now the tidy unit has a fan and a belt drive motor hanging off it - but it works.
More pics after a reply. Some interesting effects with this.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You could try to make a scanning dot camera like some of the first TV cameras. You could get pretty good resolution, infinite depth of field and a very slow framerate. It would only work in the dark, but could be quite interesting.
You could record the reflected brightness as a sound and get someone else to make the software that turns it into a picture if find that kind of thing boring.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
What you may want to try is grabbing a new mirror and optics. That aluminium mirror comes from old laser printers (not LED based, under 600dpi, and usually located above the toner cartridge). Local repair shops would likely have junked modules with only fried laser diodes. Or buy an old printer for $20.
Some old in-counter laser checkout stands (I think 1980’s) had a 10†spinning partitioned holographic disc. If you can find one – they can make all kinds of interesting scanning assemblies.
Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
As i Understand you, you were projecting an image of your Hand on the Carpet right?
How do you put in the "Data" of that image and how do you make the Y-Axis translation? With a galvo?
Pics please =D
EDIT: Ah damn. I just read "not double exposed" and understood "not long time exposed". Sorry for my lame-assness. I am a bit tired from learning for Pre-Diploma exams.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
TDO just put his hand in front of the scanning beam with a mildly long exposure(me guesses about 1s) and moved it through the beam. Each pass scanned in a slightly diferent spot giving the neat looking 3d floating hand. You can see though it because his hand was not in front of the camera the whole time, so some light from the carpet got to the camera.
Very neat!
Now that you have a laser canner you need to take it out ay night sometime and let out some smoke... It is realy cool with just hand scanning the beam at a few hz, I wonder what it is like with a barcode scanner...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I'm puzzled how you managed to take that picture TDU. The hand is pin-sharp, so it can't have moved relative to the camera. And I can see the camera didn't move relative to the carpet either. Also, I know those scanners only make a line, not a 2-D raster like in your picture. Did you open the camera shutter, then put your hand in front of the lens and move the scanning unit to swipe the beam over it?
I'd love to see you make a flying spot camera a la John Logie Baird.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
... wrote ...
TDO just put his hand in front of the scanning beam with a mildly long exposure(me guesses about 1s) and moved it through the beam. Each pass scanned in a slightly diferent spot giving the neat looking 3d floating hand. You can see though it because his hand was not in front of the camera the whole time, so some light from the carpet got to the camera. ... Now that you have a laser canner you need to take it out ay night sometime and let out some smoke... It is realy cool with just hand scanning the beam at a few hz, I wonder what it is like with a barcode scanner...
Exactly right and the exposure was 1 second. If you move your hand up towards the camera then it will be scanned. Once it is out of scan range, remove it so the camera continues to expose on the carpet. You will have minimum distortion if the hand moves towards the camera.
I have 2 laser printers to scrap when I get the time. I also just picked up 2 argon lasers (free) used in big image scanners. Lots of optics and power stuff. The lasers work but power is down from 40mW to 8 and 20mW respectively.
I did some smoke pics. While they were good to look at, the pics weren't that good, then my smoke generator died, so another day.
Here is a couple more shots. I have some really cool room shots next. My wife said "WOW!" when she saw them so obviously appealed to her redecorating nature.
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Laser Scanner
