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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
For reference, laser beams aren't triangles but are actually parabolas, although using artcan(difergence) will be a pretty good approximation.
Also, the divergence of a laser beams is inversely proportional to the beam radius, so if you run your current laser through a beam expander you will get a much better size at a distance. The easiest way to get something like that is just a pair of binoculars run in reverse, you want a nice low magnification pair (ie, cheep )
The hene would work too, although for the power they are much more expensive and fragile than a diode laser. I am unsure how much the quench platform moves during operation, but if it vibrates a lot a gas laser (hene, argon, etc) would be a poor choice.
One thing I might suggest is looking for a 'fat max' laser level. I have one of these that has a nice large diameter beam that has a very low divergence, only about 1" per 200ft.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
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Posts: 1155
With OpenCV one needs to use the exact same camera for sampling as detection. Note you would not need object detection, but rather a simple dynamic pattern matcher. The lighting in the example images also appears to be nonuniform... never a good idea for vision systems. Try a 1000w lamp, and keep it well out of frame.
The beam divergence can be minimized as the above stated... You may have to mechanically scan the trench as a beam-expander will unlikely work for this problem. Also, the green DPSS lasers may prove easier to setup.
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Scanning Laser (obstruction detection).
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