19
8018478/YWL5/2018-06| SICK
O P E R A T I N G I N S T R U C T I O N S | NAV245
Subject to change without notice
PRODUCT DESCRIPTION
3
3.4.2
Impact of objects on the measurement
Most surfaces produce a diffuse reflection of the laser beam in all directions. The structure
and color of the surface determine how well the laser beam is reflected. Bright surfaces
reflect the laser beam better than dark surfaces and can be detected by the NAV245 over
greater distances. Brilliant white plaster reflects approx. 100 % of the light, while black
foam rubber reflects approx. 2.4 %. On very rough surfaces, part of the energy is lost due
to shadowing. The sensing range of the NAV245 is therefore reduced.
Fig. 6: Diffuse reflection of objects
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 (left). If the laser beam hits a
surface at an oblique angle, energy, and range are lost accordingly (right).
Fig. 7: Targeted reflection of reflectors
The beam is not reflected diffusely in all directions; instead it is reflected in a targeted way.
Thus a large part of the emitted energy can be received by the NAV245. The NAV245 utilizes
this in order to be able to measure the positions of the reflectors extremely precisely.
