Baumer BA OADR20 - Handbuch (Seite 29)

120717_Manual_OADR20i6xx_DE_EN_V5.DOC 29/40 Baumer
18.07.12 Frauenfeld, Switzerland
4 Application hints
To reach the maximum accuracy of OADR 20I6x series laser distance sensors, keep an eye on the following
points:
Measuring on rough surfaces
All laser distance sensors are adjusted and linearized on a reference object. The object is a white ceramic
sheet with an absolutely flat surface. Many objects have a surface structure that is within the resolution of the
sensor or rougher. In such a case, the sensor with its small laser spot measures the distance including the
structure in contrast to a slide gauge that measures an average. For such applications, we recommend to
use a laser distance sensor with a laser line (OADR 20I65xx/S14F).
What can you do if you have color edges?
Often objects have several color edges on the surface.
for example:
In the field, you have no guarantee that the spot is not falling on just a color edge that can cause a
measuring fault.
Also, when the object moves, you may get an incorrect signal for each color edge (it appears that the signal
is unstable or has spikes)
In such cases, we suggest to move the object (or sensor), take several measurement values and calculate
the average. The quantity of measurement values depends on the structure, the moving speed and the
accuracy you desire.
Other possible solutions:
use a sensor with the laser line (OADR 20I65xx/S14F)
contact the Baumer electric staff
distance
max. min.
OADR
Slide gauge
Flat surface
☺ ☺ ☺ ☺
Rough surface !
grooves ! text ! pictures ! marble!
rust !
Measure with
Laser Sensors