1
2
1
Device
2
Laser pulse
3.6.4
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
Required values for calculating the light spot size and minimum object size:
•
Light spot size on the device cover: 7 mm (rounded up)
•
Light spot divergence per single pulse: 0.49 deg (8.6 mrad)
•
supplement HDDM/HDDM+ (1 measured value consists of several overlapping
single pulses): 5.8 mrad for devices with 0.33° angular resolution; 17.5 mrad for
devices with 1° angular resolution
Formula for calculating the light spot width:
(Light spot divergence [mrad] + supplement [mrad]) * 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] * Distance [mm] + Light spot size at the 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
Formula for calculating the minimum object size:
2 * supplement [mrad] * distance [mm] + light spot height [mm] = minimum object
size [mm]
Calculation example minimum object size at a distance of 4 m, with supplement
5.8 mrad:
2 * 5.8 mrad * 4,000 mm + 41.4 mm = 87.8 mm
3
PRODUCT DESCRIPTION
16
O P E R A T I N G I N S T R U C T I O N S | TiM3xx
8024851//2021-07-21 | SICK
Subject to change without notice
