1
2
1
Device
2
Laser pulse
3.7.4
Object sizes
As the distance from the device increases, the laser beam expands. As a result, the
diameter of the light spot on the surface of the object increases.
1
2
Figure 5: Beam expansion
1
Expanded laser beam
2
Optical axis
Values required to calculate the light spot size:
•
Light spot size on the device cover: 7 mm (rounded up)
•
Divergence of 1 light spot: 0.49 deg (8.6 mrad)
•
HDDM+ supplement (1 spot consists of several overlapping individual pulses):
0.33 deg (5.8 mrad)
Formula for calculating the light spot width:
(Light spot divergence [mrad] + supplement [mrad]) x distance [mm] + light spot size on
the device cover [mm] = light spot width [mm]
Calculation example light spot width at a distance of 4 m, with supplement 5.8 mrad:
(8.6 mrad +5.8 mrad) * 4,000 mm +7 mm = 64.6 mm
Formula for calculating the height of the light spot:
Light spot divergence [mrad] x Distance [mm] + Light spot height at the n device cover
[mm] = Light spot width [mm]
Example calculation of the light spot height at a distance of 4 m:
8.6 mrad * 4,000 mm +7 mm = 41.4 mm
NOTE
For reliable measurement, in particular when using the device to output measured val‐
ues, the laser needs to hit the object several times. Therefore, the object either needs
to be larger than the minimum object size, or both the LiDAR sensor and the object
must not be moving.
PRODUCT DESCRIPTION
3
8024355/15I9/2019-09-30 | SICK
O P E R A T I N G I N S T R U C T I O N S | TiM8xxP
15
Subject to change without notice
