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The Model 50L uses laser triangulation to inspect parts having 50 mm (2")
as the largest dimension. As shown below, the lower portion of the
machine houses the machine's computer and its motion control
components. On the left is the computer's monitor and to the right is
the inspection enclosure. The enclosure has a shroud that excludes light
during scanning and inspection.
To inspect a part, the shroud is lifted and the part placed on the part
fixture. After lowering the shroud, the laser light plane scans across
the part in small steps while the camera senses the location of the reflected
light. The part holder rotates 90 degrees and the process is repeated
to capture four separate views of the part. Since the camera axis is
angled at 30 degrees to the laser light axis, analysis of the camera images
determines the 3D location of the surface points by triangulation.
2 Axis Scanning
The laser light and camera are in focus over the entire inspection region,
eliminating the requirement for range tracking. However, while the
machine's repeatability is high, its accuracy is not. The
Model 50L is suitable for low resolution scanning of artwork and sports
equipment. It is also useful as a 3D comparator -- comparing a part to a known
good one.
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