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Featured Videos
The
top image and video shows a very high resolution scan of a gator skull using
a Roland 3D laser scanner. The
bottom video shows a 3D laser scan of a small shell. The ridges of this shell
are involute in form. A 3D laser scanner gathers the surface data information
for an object by shining a laser in a defined direction at the object,
recording the image of the dot projected on the object, and then calculating
the location of this point by using simple trigonometry relating the initial
direction of the laser beam with the resultant reflected beam found in a
captured image. You can build your own
crude laser scanner with a webcam and a laser-line projector mounted on a
stepper motor. You record the video as
you turn the motor, thereby projecting the laser-line across the object to be
scanned. You find all the pixels in
each frame that are red and calculate a three dimensional position for each
pixel in each frame of the video.
The
laser pointer in the video is immune to hand tremor. A novel stabilization technology (patent
pending) eliminates its laser jitter concerns. Characteristic
shapes for the author’s tremor is shown top.
Characteristic shapes for a female’s tremor is shown below that. It’s interesting to consider that people
may have unique tremor signatures that can be measured. However, the basic shapes are too similar
to really allow for good use in security systems. |
Physics Experiments Fluids
Electro-Magnetism Mechanics projectiles in magnetic fields Light green
and red lasers in gas and fluid reflection, refraction, scattering |
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