Operating Instructions
LMS5xx
Product description
8013796/ZM63/2017-05-09 © SICK AG · Germany · All rights reserved · Subject to change without notice 27
Chapter 3
If the reflected energy returned is over 100% (basis: Kodak standard) the incident beam is
not reflected diffusely in all directions, but is reflected in a specific direction (Fig. 9 on
page 26). As a result a large portion of the energy emitted can be received by the laser
distance measurement device. Plastic reflectors (“cats’ eyes”), reflective tape and triple
prisms have these properties.
Fig. 10: Mirror surfaces
At mirror surfaces the laser beam is almost entirely deflected (Fig. 10).
Instead of the surface of the mirror, it is possible that the object on which the deflected laser
beam is incident may be detected.
Fig. 11: Object smaller than diameter of the laser beam
Objects that are smaller than the diameter of the laser beam cannot reflect all the energy
of the laser light (Fig. 11). Therefore the amount of light not incident on the object is lost. If
the total amount of light reflected back to the sensor is not sufficient the object may not be
detected. This can reduce the scanning range of the sensor. If the multiple echo option is
selected, the amount of light not reflected by the front object may be reflected by a
background surface, creating therefore a second echo (see section 3.9.4 “Measured value
output for a pulse reflected with multiple echoes” on page 36).
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