Sensing the world
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Leading the change
5
2.2
0
10
20
30
-10
-20
-30
270°
Schematic diagram of the range measurement principle of the lidar sensor
XD-TOF-25
XD-TOF-25
Working principle
XD-TOF-25 is a scanning photoelectric lidar sensor. The emitted laser beam is reflected and
deflected by a mirror fixed on a rotating motor and scans the surrounding environment at a
fixed frequency. As shown in Figure 2-1, XD-TOF-25 has a two-dimensional sector area with
a scanning range of 270°. The maximum scanning distance is determined by the specific
model of the product. In each specific direction, XD-TOF-25 calculates the distance between
the obstacle and the radar at this angle by emitting a laser pulse with a short pulse width
outward and thinking the time between the pulse and the radar traveling to the obstacle. The
principle is shown in Figure 2-2.
Picture 2-1
Scanning area of lidar sensor
Fire pulse
Reflected pulse
Obstacle
Figure 2-2
The XD-TOF-25 lidar sensor emits laser pulses through a laser diode, and after related processing, it becomes a
Gaussian distributed circular spot and emits at a certain divergence angle. The beam exit diameter is 8mm. As the
detection distance increases, Figure 2-3 visually shows the beam divergence process, and Figure 2-4 shows the curve
of the spot size at different distances.
Figure 2-3 Laser pulses gradually diverge
