SICK LD-LRS - Beam Diameter and Measuring Point Distance

The portion of the light that does not reach the front object can be reflected by a larger
object in the background. If all of the light reflected to the sensor is sufficient, this
object is detected. This can lead to a corruption of the measured value.
Figure 7: Object smaller than the laser beam diameter
3.4.5 Beam diameter and measuring point distance
As the distance from the device increases, the laser beam expands. As a result, the
diameter of the measuring point increases on the surface of the object.
The range-dependent diameter of the measuring point corresponds to the distance
(mm) x 0.0028rad + 40mm.
Similarly, as the distance from the device increases, the individual measuring points
also grow further apart from one another. The distance between the measuring points
also depends on the selected angular resolution. The distance is larger with a coarser
angular resolution, and smaller with a finer angular resolution.
1
3
4
2
Figure 8: Schematic representation of the measuring point distance at different angular resolu‐
tions
1
Scan at 0.375°
2
Measuring point
3
Scan at 0.25°
4
Scan at 0.125°
The graph in figure 9shows the beam diameter and the measuring point distance
depending on the distance to the device.
3
PRODUCT DESCRIPTION
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O P E R A T I N G I N S T R U C T I O N S | LD-LRS 8016506/1G07/2020-11-08 | SICK
Subject to change without notice