Page 11
Installation and Assembly
optoNCDT ILR2250
5.
Installation and Assembly
5.1
Notes for Operation
5.1.1
Reflectance of Target Surface
The optoNCDT ILR2250-100 sensor is an optical system used to measure in the millimeter range. The sensor works
based on the phase comparison method and evaluates the direct and diffuse reflections of the laser beam sent back.
Laser beam
Ideal diffuse reflection
Real reflection
Direct mirror reflection
Laser beam
Laser beam
2
Fig. 3 Reflectance of target surface
The ILR2250-100 sensor is able to work with a reflectivity between 6 % and 100 %.
It is not possible to predict the signal strength for various surfaces due to the myriad environmental influences. The color
and surface properties of the target as well as incident ambient light and meteorological influences can all affect the
signal quality.
The expected signal quality may be impaired by the color of the measurement target.
Color impression
Reflection
Maximum range
Comparable material
Black
6–15%
30 meters
Cardboard, paper, fabric, felt
Gray
30–50%
70 meters
Concrete, gray hall wall
White
80–90%
100 meters
White paper, light wall
Reflector
100%
150 meters
ILR-RF210 reflector film
The
AUTO
Measurement mode
is recommended for dark, reflective and far-away targets. This measurement mode
optimizes the measurement frequency of the sensor, depending on the signal quality, and therefore provides the best
results even in difficult conditions.
5.1.2
Laser Spot Diameter, Min. Target Size
The laser spot diameter increases with increasing distance (displacement). Keep this in mind for the selection/size of the
target. The measuring object must have at least three times the size of the laser spot.
1 m
6 m
10 m
50 m
100 m
4 mm
3 mm
a
b
6 mm
4 mm
10 mm
6 mm
49 mm
33 mm
99 mm
66 mm
150 m
150 mm
100 mm
b
a
Distance
Minimum target size
in mm
SMR
ILR2250
12
30x18
18x12
12x9
9
297
198
450
300
Spot size
(ellipse)
Fig. 4 Laser spot dimensions and size of measuring object depending on the distance
