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Laser
Scanning Apparatus |
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| (A) | (B) |
| (A) A
typical laser scanning unit. A plane of laser light (broken line) is projected onto the
surface (black rectangle). Two cameras (c1 and c2) view the reflection and depth is
determined by triangulation. The use of two cameras provides redundancy and reduces the
number of sample points missed due to occlusion. The resolving power of depth measurements
is determined by camera specifications, the width of the cameras (d) and their
angle. Although increases in the latter tow can provide greater depth resolution, they
reduce the ability of the system to determine depths on rough surfaces. (B) The commercial scanner employed for this project
was a Replica 3D scanner with Reversa 25 optics hardware interfaced with a Windows NT
computer running RISCAN software Replica 3D scanner with Reversa 25 optics hardware
interfaced with a Windows NT computer running RISCAN software (3D Scanners, Ltd., Coventry, UK) |
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