21
8018478/YWL5/2018-06| SICK
O P E R A T I N G I N S T R U C T I O N S | NAV245
Subject to change without notice
PRODUCT DESCRIPTION
3
3.4.4
Beam diameter and measuring point distance
As the distance from the NAV245 increases, its laser beam expands. As a result, the beam
diameter increases on the surface of the object.
The range-dependent beam diameter corresponds to the distance (mm) × 0.015 rad + 8 mm.
As the distance from the NAV245 increases, the individual measuring points also grow
further apart from one another. The graph in fig. 10 shows the beam diameter and the
measuring point distance depending on the distance from the NAV245.
Fig. 9: Beam diameter and measuring point distance at 0 to 50 m
For an object to be detected reliably, it must be completely hit by the beam once. If it is only
partially hit, less energy will be reflected from the object than is required in some cases
(
see “Possible sources of error when measuring”, page 20
0
Distance [m]
Size [mm]
30
50
0
200
400
Measuring point distance
20
10
600
800
40
Beam diameter
0.25° angular
resolution
Beam diameter
