2.3.3 Ambient lighting
The Integrus system is practically immune for the effect of
ambient lighting.Fluorescent lamps (with or without elec-
tronic ballast or dimming facility), such as TL lamps or
energy saving lamps give no problems with the Integrus
system.Also sunlight and artificial lighting with incandes-
cent or halogen lamps up to 1000 lux give no problems
with the Integrus system.When high levels of artificial
lighting with incandescent or halogen lamps,such as spot-
lights or stage lighting are applied, you should directly
point a radiator at the receivers in order to ensure reliable
transmission. For venues containing large, unscreened
windows, you must plan on using additional radiators.
For events taking place in the open air a site test will be
required in order to determine the required amount of
radiators.With sufficient radiators installed,the receivers
will work without errors,even in bright sunlight.
2.3.4 Objects, surfaces and reflections
The presence of objects in a conference venue can influ-
ence 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 2.10).
With few exceptions it cannot pass through materials
that are opaque to visible light.
Figure 2.10 The texture of the material determines how much light is
reflected and how much is absorbed
Problems caused by shadows from walls or furniture can
be solved by ensuring that there are sufficient radiators
and that they are well positioned, so that a strong enough
infra-red field is produced over the whole conference
area.Care should be taken not to direct radiators towards
uncovered windows, as most of this radiation will subse-
quently be lost.
2.3.5 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 recep-
tion and should therefore not be minimised. Radiators
should be positioned high enough not to be blocked by
people in the hall (see figure 2.11 and figure 2.12).
Figure 2.11 Infra-red signal blocked by a person in front of the participant
Figure 2.12 Infra-red signal not blocked by a person in front of the par-
ticipant
The figures below illustrate how infra-red radiation can
be directed to conference participants. In figure 2.14, the
participant is situated clear from obstacles and walls, so a
combination of direct and diffused radiation can be
received.Figure 2.13 shows the signal being reflected from
a number of surfaces to the participant.
10 | System description and planning | Integrus Data brochure
(136 paginas)
(19 paginas)
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