Product description
24
© SICK AG · Germany · All rights reserved · Subject to change without notice
8012471/ZN27/2017-06-09
Operating Instructions
LMS1xx Laser Measurement Sensors
Chapter
3
Direction measurement
The emitted laser beams are deflected using a mirror and scan the surroundings in a circu-
lar manner. The measurements are triggered at regular steps using an angular encoder.
The LMS1xx scans with a scanning frequency of 25 or 50 Hz. During this process, a laser
pulse and therefore a measurement is triggered after an angular step of 0.25° or 0.50°.
Influences of object surfaces on the measurement
The signal received from a perfectly diffuse reflecting white surface corresponds to the defi-
nition of a remission of 100 %. As a result of this definition, the remissions for surfaces that
reflect the light bundled (mirrored surfaces, reflectors), are more than 100 %.
Fig. 6:
Reflection of the laser beam at the surface of an object
The majority of surfaces reflect the laser beam diffusely in all directions.
The reflection of the laser beam will vary as a function of the surface’s structure and color.
Light surfaces reflect the laser beam better than dark surfaces and can be detected by the
LMS1xx over larger distances. Bright white plaster reflects approx. 100 % of the incident
light, black foam rubber approx. 2.4 %. On very rough surfaces, part of the energy is lost due
to shading. The scanning range of the LMS1xx will be reduced as a result.
Fig. 7:
Reflection angle
The reflection angle is the same as the angle of incidence. If the laser beam is incident
perpendicularly on a surface, the energy is optimally reflected (
). If the beam is
incident at an angle, a corresponding energy and scanning range loss occurs (
