Bosch INTEGRUS Specifications download pdf (Page 12)

2.3.6 Overlapping footprints and multipath effects

When the footprints of two radiators partly overlap, the

total coverage area can be larger than the sum of the two

separate footprints. In the overlap area the signal radia-

tion power of two radiators are added,which increases

the area where the radiation intensity is larger than the

required intensity.

However, differences in the delays of the signals picked up

by the receiver from two or more radiators can result in

that the signals cancel each other out (multi path effect).

In worst-case situations this can lead to a loss of recep-

tion at such positions (black spots).

Figure 2.18 and figure 2.19 illustrate the effect of

overlapping footprints and differences in signal delays.

Figure 2.18 Increased coverage area caused by added radiation power

Figure 2.19 Reduced coverage area caused by differences in cable

signal delay

The lower the carrier frequency, the less susceptible the

receiver is for differences in signal delays.

The signal delays can be compensated by using the delay

compensation switches on the radiators (see manual).

2.4 Planning an Integrus infra-red radiation system

2.4.1 Rectangular footprints

Determining the optimal number of infra-red radiators

required to give 100% coverage of a hall can normally

only be done by performing a site test.However, a good

estimation can be made by using ‘guaranteed rectangular

footprints’. Figure 2.20 and figure 2.21 show what is

meant by a rectangular footprint.As can be seen, the

rectangular footprint is smaller than the total footprint.

Note that in figure 2.21 the ‘offset’ X is negative because

the radiator is actually mounted beyond the horizontal

point at which the rectangular footprint starts.

Figure 2.20 A typical rectangular footprint for a mounting angle of 15°

Figure 2.21 A typical rectangular footprint for a mounting angle of 90°

The guaranteed rectangular footprints for various num-

ber of carriers, mounting heights and mounting angles

can be found in section 2.5. The height is the distance

from the reception plane and not from the floor.

12 | System description and planning | Integrus Data brochure

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Bosch INTEGRUS Specifications Page 12