With laser triangulation the distance between an object (3)
and a reference plane (2) is determined without contact.
Similar to a tactile sensor, a triangulation sensor
yields a one-dimensional measuring quantity.
The laser beam is directed onto the workpiece. The laser light
is scattered at the point of interaction with the surface.
|
|
|
|
A lens (4), which is placed in a defined angle in relation to the
direction of the laser beam, directs the light onto a detector (5).
From the position of the light dot on the detector (y1 and y2), the
distance from the object (z1 and z2) can be calculated.
|
| This measurement principle can be extended
to a two-dimensional measurement by shaping the laser beam
into a line which is projected onto the workpiece. This method
is called laser light section. |
Adjustment of a laser triangulation sensor
The relation between the position of the spot on the detector
and the distance of an object to the leading edge of the sensor is
established under defined ambient conditions in the sensor adjustment
facility at NoKra. A high precision translatin axis is used to
position a reference body in defined distances to the triangulation
sensor. Basis of this adjustment and calibration process is
the standard DIN 32877.
|
|
|
|
