Bosch Appliances 3122 475 22015en manual Positioning the radiators

INTEGRUS Installation and User Instructions System description and planning en 5

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.				Figure 1.11 Infra-red signal blocked by a person in front of
				the participant
100%	40%	100%	80%

Figure 1.10 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 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).

Figure 1.12 Infra-red signal not blocked by a person in front of the participant

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 1.13 Combination of direct and reflected radiation

Bosch Security Systems 2005-04 3122 475 22015en