Product description
22
© SICK AG · Germany · All rights reserved · Subject to change without notice
8013889/ZML0/2017-06-09
Operating Instructions
NAV350 Laser positioning sensor
Chapter
3
3.5.3
Scanning range of the NAV350
The scanning range of the NAV350 is dependent on the remission of the objects to be de--
tected. The better a surface reflects the incident radiation, the greater the scanning range
of the NAV350.
3.5.4
Beam diameter and distance between measured points
With increasing distance from the NAV350 the laser beam increases in size. As a result the
beam diameter on the surface of the object increases.
The distance-dependent beam diameter is the distance (mm (in)) × 0.005 rad + 20 mm
(0,79 in).
With increasing distance from the NAV350 the spacing between the individual measured
points also increases. The diagram in
fig. 8
shows the beam diameter and the distance be--
tween measured points as a function of the distance from the NAV350.
Fig. 8:
Beam diameter and distance between measured points at 0 to 100 m
To reliably detect an object, a laser beam must be fully incident on it once. If the beam is
partially incident, less energy will be reflected by an object than necessary in some circum--
stances (see
fig. 7 on page 21
).
How to calculate the minimum object size:
Beam di distance between measured points = minimum object size
For beam diameter and distance between measured points as a function of the dis-
tance from the NAV350 see the diagram in
fig. 8
.
Material
Remission
Range
Black car paint, matt
5%
0.5 … 24 m (1.64 … 78.74 ft)
Black photographic cardboard,
matt
10%
0.5 … 35 m (1.64 … 114.8 ft)
Grey concrete
18%
0.5 … 45 m (1.64 … 147.6 ft)
White cardboard
90%
0.5 … 100 m (1.64 … 328.1 ft)
White plaster
100%
0.5 … 110 m (1.64 … 360.9 ft)
Reflective tape
>300%
0.5 … approx. 250 m (820.21 ft)
Tab. 6:
Typical remissions and scanning ranges
0
Distance in m
Si
ze in mm
20
40
80
100
0
200
Beam diameter
Distance between measured points
400
60
800
600
