Operating Instructions
LMS5xx
Product description
8013796/ZM63/2017-05-09 © SICK AG · Germany · All rights reserved · Subject to change without notice 25
Chapter 3
Distance measurement
The LMS5xx emits pulsed laser beams using a laser diode. If a laser beam is reflected on a
target object the reflected beam is received at the sensor.
Fig. 6: Principle of operation for time of flight measurement
The distance to the object is calculated by the time required for the pulsed beam to be
reflected and received by the sensor. This principle of “Time of flight” is used by radar
systems in a similar manner (see also section 3.9.4 “Measured value output for a pulse
reflected with multiple echoes” on page 36).
Direction measurement
The emitted laser beams are deflected using an internal rotating mirror and scanning the
surroundings in a circular manner. The measurements are triggered at regular steps using
an angular encoder.
The LMS5xx PRO/Heavy Duty scans with an adjustable scanning frequency of 25, 35, 50,
75 or 100 Hz. During this process, a laser pulse and therefore a measurement is triggered
after an angular step of 0.1667°, 0.25°, 0.33°, 0.5°, 0.6667° or 1°.
The LMS5xx Lite scans with a scanning frequency of 25, 50 or 75 Hz and angular steps of
0.25°, 0.5° or 1°.
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