Don
Video Link...
http://www.youtube.com/watch?v=n7Z_mZf9BX4
3d laser scanner recipe.
ingredients:
- 1 Line laser (ebay)
- 1 Arduino (ebay)
- 1 Stepper Motor (ebay longs-motor)
- 1 Stepper motor driver (up to 12800 steps)(ebay longs-motor)
- 1 12V power supply (from a chinese DVD player)
- 1 Infrared LED (from a remote control)
- 1 Digital SLR (Nikon D7000, Nikon SLR or a infrared remotely controlled SRL)
- 1 Piece of wood (plywood, plexiglass, metal, or whatever you prefer)
- 1 Ball head (get from a 5€ tripod bought from Chinese)
- Matalb (or Octave)
A line laser is a laser equipped with a cylindrical lens, in this case I used a red laser, but other colors can be used, like green or blue. The lens opens the beam shaping it into a plane. The one I used in this experiment is characterized by a nominal power of 100mW (not up to standard in Italy, I think the max allowed power is 5mW) but the beam does not remain focused in a single ray, it is extended in a plane, so the intensity quickly drops below dangerous levels.
The principle behind this scanner is the typical of a line scanner. A laser beam intercepts the object to be measured and a camera, positioned at a known angle and distance shoots a series of images. With some trigonometry considerations and optic laws it is relatively easy to reconstruct the Zeta dimension, the measurement of the distance between the object and the camera.
Commercial systems based on this principle, named line scanner or profilometers, are used in industries and are typically characterized by a high frame rate (even 200 or more frames per second) and a strength suitable for industrial uses. An industrial profilometer price ranges from a few thousand Euros to several tens of thousands of Euros. The cost of the components for the system I propose here does not exceed 100/150 €, if you already have an SLR
Read More...
http://www.youtube.com/watch?v=n7Z_mZf9BX4
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