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Functional principle
The distance measured is based on the triangulation principle. The emitted laser beam falls on the
object as a small light spot and will be reflected diffusely. The position of the received light spot on
the receiver (a diode line) defines the receiving angle. This angle corresponds to the distance and is
the base for the internal calculations.
A distance change close to the sensor effects a large change in angle; the same distance change at
the end of the measuring range has a much smaller effect to the angle. This non-linearity feature is
linearized by the microcontroller. The analog output signal is linear to the distance.
The sensor adapts automatically to different object colors by varying the emitting laser intensity and
optimizing the exposure time. The result is a sensor that is nearly independent on different reflections
(different colors, shiny surfaces, dark objects). The sensor reaches its highest accuracy if the object
reflects diffusely.
Diode line with
receiving light spot
Object far away
Object close to sensor
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Mounting instructions
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For a proper mounting, the mounting surface has to be flat. Be aware of the max. tightening
torque.
•
In case of EMC, the sensor has to be grounded and a shielded cable has to be used.
•
The 90° rotating connecter allows wiring the sensor from the bottom side or from the rear.
•
The max. accuracy will be reached >15 minutes after power on.
Steps / edges:
When measuring right next to steps / edges, it is important that the receiving beam is not covered by
the steps / edges. This also applies to depth measurements of holes or valleys.
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Mounting above shiny surfaces:
On shiny surfaces, it is important that no direct reflection can get to the receiving optics. The reflec-
tion could blind the sensor and produce poor results. To prevent this, the sensor may be slightly
tilted.
The direct reflection can be seen on a white piece of paper when held in front of the receiver.
Mounting above round, shiny surfaces:
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Objects with color edges in the same direction:
When color edges are orientated in the right direction, the effect to the measuring result will be minor.
If the color edges are in the wrong direction, the effect will depend on the reflectivity of the different
colors.
Shiny objects with a constant structure
Especially shiny objects with a constant structure (lathed or scuffed objects, extruded aluminum
profiles, etc.) could have a negative effect on the measuring result.