11
Use of deflector mirrors
For the protection and control of areas that can be accessed from several sides, in
addition to the emitter and the receiver you can also use one or more deflector mirrors.
Deflector mirrors, in fact, make it possible to reflect back on several sides the optical
beams generated by the emitter.
The figure below shows an application using two deflector mirrors to achieve a type “U”
protection.
Figure 7
If you use deflector mirrors, keep in mind the following requirements:
• Arrange the mirrors so that the minimum distance S is respected on each of the
access sides to the hazardous area.
• The emitter-receiver distance is given by the sum of the lengths of all the sides
giving access to the controlled area (l
1
+l
2
+l
3
in figure 7).
• Keep in mind that the maximum effective capacity between the emitter and the
receiver decreases by 10% for each additional mirror employed.
• It is important to achieve accurate alignment between the emitter, the mirrors and
the receiver.
• We recommend using a maximum of three deflector mirrors.
To Next Page
Loading...