Figure 3: LiDAR sensor with one scan plane
3.4.2
Range finding
The device emits beams pulsed by a laser diode. If the laser beam is reflected by an
object, the reflected beam is received by the sensor.
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
The device uses SICK’s own HDDM+ (High Definition Distance Measurement plus)
technology. With this measurement process, a measured value is formed statistical
evaluation of multiple single pulses. The multi-pulse feature of HDDM+ evaluates up
to 165,000 echoes per second with every scan. Every single HDDM+ measured value
output therefore provides even more information because it is not just composed of
a single time-of-flight measurement, but includes evaluated information from numer‐
ous pulses. In this process, the digitized echoes are compiled into data packages
which overlap during evaluation. This guarantees a significantly more stable time and
distance measurement.
3.4.3
Direction measurement
The laser beams are emitted using internally rotating sender-receiver units (SRUs) and
scan the surroundings orbitally. The received measured values are assigned to the
associated angular cut and thus to the direction.
3
PRODUCT DESCRIPTION
12
O P E R A T I N G I N S T R U C T I O N S | LMS1104C-111031S01
8023051/1AZG/2021-05-10 | SICK
Subject to change without notice
