EP0747868B1 - Arrangement with emission seal structure in infrared region - Google Patents

Description

The invention relates to an arrangement according to the preamble of claim 1.

Motion detectors operating in the frequency range of visible or invisible radiation for interior security are based on the detection of time and location occurring changes in a specific radiation caused by penetrating into the room People are caused. Such an arrangement is known for example from EP-A-0 402 829. With this detection, the influence of the background which is generally formed by a solid wall, of considerable importance. It can be assumed that large wall areas are usually too monitoring interiors for the very frequently used middle infrared range Wavelengths from 8 to 14 µm have a relatively high and homogeneous emissivity Own> 0.6. An intruding person can look at such a homogeneous Targeted background with suitable clothing or by means of camouflage protect from fabric or paper from detection by the motion detector and thereby go unnoticed.

The object of the invention is therefore an arrangement according to the preamble of the claim 1 to create who act cleverly by the tools mentioned Don't trick intruders.

This object is achieved by the features characterized in claim 1. Appropriate refinements and developments of the subject matter of the invention are mentioned in the subclaims.

An essential advantage of the solution according to the invention is that a wall, the surface of which is prepared by structure-forming agents in such a way that it maintains optically effective structure when penetrating into the room Makes an important contribution to people. This can be common, in practice many times proven passive motion detectors are used.

In a further development of the subject matter of the invention, it is useful, especially in the middle Infrared range, because there are a variety of suitable passive motion detectors with the desired technical properties is available.

To promote the effectiveness in the infrared range, it is useful to use the structure-forming Apply means on the wall surface so that along the horizontal directions of movement a significant change in emissivity emanating from the wall arises. It is thus possible to have a surface structure effective in the infrared spectral range to be defined by localized areas so that there is Spectral range areas with high emissivity and areas with high reflectance alternate. In an advantageous embodiment there is a for these surface areas vertical stripe pattern provided. Such a stripe pattern is for that reason alone useful because it provides a high-contrast background in the infrared that a person acting as an infrared transmitter (heat source) through his reflection behavior and also by multiple reflections additional detection areas and consequently generates additional signal fluctuations.

The structure-forming agents can be applied directly to a finished, possibly papered Wall surface, adhered to it, e.g. be stuck on. But it is also possible to integrate aiese into a wallpaper and then with the wallpaper on a Wall.

On the one hand for reasons of taste, so that the appearance of a wall surface does not is impaired, and on the other hand because of a possibly required for security reasons hidden installation of the optically effective elements, it is from Advantage if the structure-forming agents in the visible spectral range are only very small Form contrasts and therefore remain largely invisible.

To create localized areas with a high degree of reflection can have a high emissivity base with a coating be provided, which has a high degree of reflection. For the coating a binder and a filler is required, in particular the filler for the of interest in the middle infrared region has a high degree of reflection and the binder should be as transparent as possible. Another option is one partially coated with highly reflective metal films (e.g. aluminum) are covered with a thin polyethylene film. This slide can be used for the visible Area can be colored accordingly and is for the infrared range of interest sufficiently transparent.

Fig. 1

eine Draufsicht eines zu überwachenden Raumes mit Infrarot-Bewegungsmelder und strukturierten Wandbereichen

Fig. 2

eine Seitenansicht des Raumes mit Eindringling.

An embodiment is shown in the drawings and will be described in more detail below. Show it:

Fig. 1

a plan view of a room to be monitored with infrared motion detectors and structured wall areas

Fig. 2

a side view of the room with intruder.

How to recognize the images of a room to be monitored shown in FIGS. 1 and 2 leave, is a passive infrared motion detector 2 with a door 7 appropriate sensitivity characteristic 3 attached. Based on the principle of operation an intruder A, in general, is possible homogeneous background 8 to enter room 1 with a suitable camouflage shield 5, without the motion detector 2 registering the intrusion. Through a vertical Emissivity structure for the infrared range with highly reflective surfaces 4 <0.2 and intermediate areas with high emissivity> 0.6 will go unnoticed Penetration almost impossible because intruder A's movement is too leads temporally changing radiation flows, which the motion detector 2 detects. Another advantage is that by multiple reflections 6 on the reflective Surfaces 4 also detect intruders B that are outside of the actual one Detection area 3 of the motion detector 2 are.

As a result of the arrangement according to the invention, the detection reliability can be increased monitoring rooms 1 can be significantly improved. The invisible division the wall area does not give the intruder any means of aiding himself to camouflage. The geometry and the position of the reflecting surfaces 4 can spatial conditions are adjusted accordingly.

Claims (7)

1. An arrangement with at least one passive motion detector (2) for detecting persons who pass through a room (1) limited on at least one side by a wall, characterized in that optically effective, structure-forming means (4) are applied onto the wall surface (8) over larger surface areas, which means are provided with a high degree of reflection against the back of the wall surface (8), so that locally limited areas with a high degree of emission alternate on the walls surface (8) with locally limited areas with a low degree of emission.
2. An arrangement as claimed in claim 1, characterized in that the passive motion detector operates in the middle infrared range.
3. An arrangement as claimed in one of the preceding claims, characterized in that the locally limited surface areas with different degrees of emission form a vertically extending stripe pattern.
4. An arrangement as claimed in one of the preceding claims, characterized in that the structure-forming means (4) can be adhesively applied to a finished wall surface (8) which may optionally be wallpapered.
5. An arrangement as claimed in one of the claims 1 to 3, characterized in that the structure-forming means are integrated in a wallpaper which can be applied to the wall surface (8).
6. An arrangement as claimed in one of the preceding claims, characterized in that the structure-forming means (4) are arranged in such a way that in the visible spectral region they form only such low contrast with the environment so that they remain virtually invisible.
7. An arrangement as claimed in one of the preceding claims, characterized in that for producing the locally limited surface areas (4) with a high degree of reflection a coating is performed with a base (8) having a high degree of emission, and a fixing agent and filling materials are used for the coating, with the filling material in particular having a high degree of reflection and the fixing agent being transparent to the highest possible degree.

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