MICRO-EPSILON
X9751109-B060097MSC
33
Fig. 8.7: Shadows
Shading of the laser
line
Shading of the
receiver
8.4.6
Surface Roughness
Surface roughness in the order of magnitude of 5 μm and above leads to "surface
noise" due to interference of the laser light. In addition, direct reflections of the laser
light on very fine grooves (e.g. grinding marks on the surface) can also occur,
particularly if they run in the direction of the lines. This can lead to erroneous
measurements.
A remedy by matching the illumination (see Chap. 8.4.2) or the selection of a different
evaluation method (see Chap. 11) is probably.
8.4.7
Shadows
Laser line
:
The fan shape of the laser line inevitably leads to partial shading of vertical edges. To
render these regions visible, only changing the position of the sensor or target provides
a remedy.
Receiver
:
The laser line may disappear completely or partially behind steep edges. The receiver
then does not "see" these areas.
Generally, targets with steep edges cannot be acquired one hundred percent with laser
triangulation. The missing areas can only be supplemented or interpolated with suitable
software.
i
IMPORTANT!
The laser beam must
impinge on the target
surface perpendicularly,
otherwise measurement
uncertainties cannot be
eliminated.
Information for Operation
