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INTEGRUS | Installation and User Instructions | System description and planning en | 5
Bosch Security Systems | 2005-04 | 3122 475 22015en
1.3.4 Objects, surfaces and reflections
The presence of objects in a conference venue can
influence the distribution of infra-red light. The texture
and colour of the objects, walls and ceilings also plays
an important role.
Infra-red radiation is reflected from almost all surfaces.
As is the case with visible light, smooth, bright or shiny
surfaces reflect well. Dark or rough surfaces absorb
large proportions of the infra-red signal (see figure
1.10). With few exceptions it cannot pass through mate-
rials that are opaque to visible light.
Problems caused by shadows from walls or furniture
can be solved by ensuring that there are sufficient radi-
ators and that they are well positioned, so that a strong
enough infra-red field is produced over the whole con-
ference area. Care should be taken not to direct radia-
tors towards uncovered windows, as most of this radia-
tion will subsequently be lost.
1.3.5 Positioning the radiators
Since infra-red radiation can reach a receiver directly
and/or via diffused reflections, it is important to take
this into account when considering the positioning of
the radiators. Though it is best if receivers pick up
direct path infra-red radiation, reflections improve the
signal reception and should therefore not be min-
imised. Radiators should be positioned high enough
not to be blocked by people in the hall (see figure 1.11
and figure 1.12).
The figures below illustrate how infra-red radiation can
be directed to conference participants. In figure 1.13,
the participant is situated clear from obstacles and
walls, so a combination of direct and diffused radiation
can be received. Figure 1.14 shows the signal being
reflected from a number of surfaces to the participant.
Figure 1.10 The texture of the material determines how
much light is reflected and how much is
absorbed
Figure 1.11 Infra-red signal blocked by a person in front of
the participant
Figure 1.12 Infra-red signal not blocked by a person in front
of the participant
Figure 1.13 Combination of direct and reflected radiation
100% 40% 100% 80%