19
9.3.- INFRARED TRANSMITTER
This is the element installed in the crane, which generates the infrared modulated radiation with an
identity code, which permits the sensor its identification.
Emission angle in long travel direction is wider than those of cross travel direction. In this way, the
working area covered by a transmitter is similar in shape to an ellipse, whose dimensions depend
on the height of the bridge over the ground. Approximately, the diagonals of the ellipse according to
the height are the following:
h (m)
D (m)
d (m)
6
24
10
8
32
13
10
40
17
12
48
20
14
56
23
16
64
26
18
68
29
20
70
32
In cases in which it is believed that the area covered by one transmitter is not enough, more slave
transmitters can be installed.