The distance to the object is calculated on the basis of the time that the pulsed light
beam requires to be reflected and received by the sensor.
t
1
2
1
Send pulse
2
Receive pulse
3.5.3
Direction measurement
The laser beams are emitted using 4 internally rotating polygon mirrors and scan the
surroundings orbitally on 4 planes. The measured values are assigned to the associ‐
ated angular cut, and thus to the direction, by 6 receive elements.
3.5.4
Impact of object surfaces on the measurement
The received signal from a perfectly diffuse reflection from a white surface (diffuse
Lambertian reflector) corresponds to a remission of 100%. By this definition, surfaces
that reflect the light in bundles (specular surfaces, reflectors) have remissions of over
100%.
Reflection
Most surfaces produce a diffuse reflection of the laser beam in all directions. The struc‐
ture (smooth or rough), shape (flat or curved), and color (light or dark) of the surface
determine how well the laser beam is reflected.
On very rough surfaces, part of the energy is lost due to shadowing. Curved surfaces
produce a higher diffusion. Dark surfaces reflect the laser beam worse than light ones
(brilliant white plaster reflects approx. 100% of the light, while black foam rubber
reflects approx. 2.4%). The aforementioned surface characteristics can reduce the
scanning range of the device, in particular for surfaces with low remission values.
Figure 5: Reflection of light on the surface of the object
Angle of reflection
The angle of reflection corresponds to the angle of incidence. If the laser beam hits a
surface at right angles, the energy is optimally reflected. If the laser beam hits a sur‐
face at an oblique angle, energy and range are lost accordingly.
3
PRODUCT DESCRIPTION
14
O P E R A T I N G I N S T R U C T I O N S | MRS6000
8022069/114M/2019-07-17 | SICK
Subject to change without notice
