Triple-IN
GmbH
© Triple-In GmbH • 27/01/2016 11:07:00
PSxxx-20 Laser Scanner User's Manual
7
7
7
7
3
Triple-IN’s KEM Time-of-Flight Technology
The technological basis for the Triple-IN PS Range Modules is “Time-of-Flight”
(ToF): the travel time of light emitted by a laser diode to natural surface.
Triple-IN’ KEM method (“kontinuierliche Event Messung”) improves this well-
known technology:
Picture 3 Principle of operation
1.
An angle encoder triggers a laser diode in regular angle steps.
2.
The laser diode emits an infrared laser beam. This “start pulse“ marks the
beginning of the time-of-flight measurement.
3.
A mirror, which is connected to the angle encoder, reflects the laser beam
in certain directions. An even scan area is formed by the rotation of the
mirror.
4.
The laser beam is reflected by natural surfaces. Several echoes can be the
result of window panes, rain drops, snowflakes and similar objects which
reflect parts of the laser pulse’s energy. This effect is called “multi-echo”.
PS Range Modules can record the results of up to 4 echoes for each laser
beam.
5.
The echo signal variates by the surface reflectivity and the distance to the
object. The echo signal will be detected by as soon as it passes a receiver
threshold. The sensor measures the time-of-flight and the pulse width of
the echo signal.
