IT8147540A1 - IMPROVEMENT IN ANTI-INTRUSION ALARM SYSTEMS. - Google Patents

Description

DESCRIPTION

a. with a patent application for an invention entitled:

"Perf ection in intrusion alarm systems"

SUMMARY

An intruder alarm system on and, more? especially to reveal intruders who. they enter through the area a of the roof, but. likewise, usable to detect attempted removal of a protected neck, comprising a source of radiation which projects a moving beam, the beam being reflected back substantially parallel to the projected path for comparison with. the rifle sicne of a beam previously projected on the stopped point. The projected beam can? explore an entire area horizontally or vertically, or can it? be deflected to form a conical exploration to surround a specific neck.

This invention refers to intrusion alarm systems and, more? particularly, although not exclusively, to alarm systems to indicate the entry of an intruder through the roof of a generally open-plan building, such as a warehouse, warehouse, office or shed type building.

Intrusion alarm devices generally available for such buildings are expensive and difficult to install. Furthermore, they are generally not considered very effective since they are not considered very effective. invariably only the louvered elements in the roof are securely protected, thus leaving the the roof covering in a penetrable condition. In a large building, chefacilment e pu? having a roof comprising about 33% glass, the cost of protecting each sheet or set of. plates against intruders? prohibitive if you do not reinforce the glass * In roof areas where there is? a.quantit? smaller than glass, you will generate less safety systems on each window but again, a large roof area? penetrable and an intruder would not be revealed.

Therefore, a purpose of this invention? the implementation of an intrusion alarm system in which not only the entry through the glass section of the roof is detected but the entry through any part of the roof is also detected

A further object of this invention? il. to create an intruder alarm system which, in comparison, is cheap and easy to install.

According to the invention, an intrusion alarm system is provided comprising means for producing a generally non-redrevable moving beam scan, receptor means for receiving reflected scan signals of said mobile scan beam, memory and comparator means for recording a first signal. reflex scan and comparing subsequent reflex scan signals with said first reflex scan signal, and signaling means which function when any of the reflex subsequent scan signals differ from said first reflex scan signal.

The invention will come now described only by way of example together with the attached drawings, in which:

Figure 1 shows an example of the alarm system;

Figure 2 shows a procedure for covering dead or blind spots,

Figure 3 shows a variant of Figure 1, capable of covering the perimeter of a specific floor or package space, and

Figure 4 shows a block diagram of the electronic system.

With reference to Figure 1, a box containing an electronic circuitry 1 ... has, extending. at the bottom of it, a first .general section. ferally tubular 2 A second section, generally tubular 3, concentric with section 2? swivel, preferably on bearings 4 around section 2 and can? be rotationally driven by a low-power motor 5 through transmission means such as a transmission gear or belt drive. An extending partial wall of the section 3 has, suitably fixed to it, brackets 7 or the like, only part shown for clarity for positioning optical deflectors such as mirrors or

first 8 and 9 and a focus lens 10. Centrally positioned in the internal section 2 vi? a source of radiation, preferably a low-power laser 11, a unit? 12 with a collimation lens and a translucent platform preferably transparent - 13? Extending downward from the plate? Rma 13 vi? a support? for positioning an electric celia 8 14. Preferably an optical filter

15? positioned between the optical deviator 9 and la

cell 14 or it can? be positioned or of

in front of or behind the lens 10. A laser beam

16 put in collimation by the unit? lens 12

it is reflected by the mirror or prism 8 and transmitted substantially horizontally at any convenient distance below the roof level, to the walls of the building where it is reflected back substantially parallel to the output beam, to the mirror or prism 9 to be deflected through the filter 15 which rejects all the wavelengths different from the wavelength of the beam, on the optoelectric cell 14. The output of the cell at a first sampling is processed and fed into a unit. where it is stored with an address code signal from a position sensor, preferably an encoder disk 17 positioned on and which moves with the second section. . of exploration of a particular punished are received, the point

is recognized by the encoder disk address code sign and the expioration signals are referably compared. have in the range of 2000 signals

pulse encoded, each having address codes per revolution, with a separation of 60 microseconds at .500 rpm, to gain access to the appropriate memory box.

During the separation of .60 microseconds between successive pulses of the higher code, the laser transmits a pulse of light, of .200 nanoseconds.

During each round of section 3, 2000 samples are taken and / a building, with a periphery of 240 meters, which yields a sample approximately every 120 mm and therefore? two samples when passing a human torso. Each scanned sample is preferably recorded in the memory at a brightness level. but other methods such as time factors can be used. When, the exploration returns to the same point, 120 milliseconds later, the new brightness level? is compared with the previous level and if different to two consecutive samples, the 1st alarm signal is triggered. If the new brightness? ? only slightly different, or is it just a sample? different, the new levels are memorized and the updating continues at a rate of 8.3 times per second.

With reference now to figure 2 in which a procedure is shown to cover the dead spots or areas, we will make it? hundred than the majority of large-area roofs? supported on pillars

18 in the building. These

before the beam reaches the wall, causing a dead zone between the pillar and the wall through which an intruder can reach the wall. enter the building through the roof. To overcome this problem, relatively high reflection surfaces such as mirrors 19 can be arranged on the wall to reflect the scan beam in the dead zones or a series of relative reflection surfaces. In a continuous path, the beam behind the stackers can be utilized so that all dead zones can be explored and monitored continuously at the same time.

To avoid lack of effect due to the disconnection of the energy, batteries can be charged from the mains supply and the system can be charged. be operated from a 12 or 24 volt power supply so that in the event of a mains failure due to malfunction or sabotage, the. the system would still work correctly on the batteries until the yarn supply came. restored.

With reference to Figure 3, in which.

? shown a variant of FIG. 1 which is capable of covering the perimeter of a specific floor or neck space 20, additional beam deflector means 21 and 22 are positioned in the paths of the transmitted and received beams to provide a conical scan. through which an intruder would have to pass by doing so? trigger the alarm.

In a variant of Figure 3, the radiation from the diverter 21 can? be directed at a highly reflective surface before returning to the diverter 22 thus forming? a radiation curtain, which if interrupted, would sound the alarm. In this dispqsiziqne, you can? do without the use of memory circuits. Figure 4 showing block diagram of the electronic system? self-explanatory. Those skilled in the art will appreciate that, depending on the type of radiation source and receptor used, various reflecting surfaces can be used to reflect the scan beam returning to the cell. A white painted wall or a self-adhesive aluminum tape or similar can? be used, or a cell can? be able to receive a specific part of the color spectrum with the electronics programmed accordingly.

Claims (1)

1. An intrusion alarm system comprising means for producing a generally non-detectable rotating band scan, receiver means for receiving reflected scan signals of said rotating beam beam, memory and comparator means for. recording a first reflected scan signal and comparing subsequent reflected scan signals with said first reflected scan signal, and alarm means operable when any of the subsequent reflected scan signals differ from said first reflected scan signal. 2. Intrusion alarm system according to claim having a filter in the path of said reflected expioration signal capable of rejecting all received wavelengths other than the wavelength of the beam. Anti-intrusion alarm system according to rev. 1 or rev. 2, in which the rotating beam is produced by a low-power laser. 4. Intrusion alarm system according to any previous rev. in which reflective surfaces are used to cover dead zones caused to such elements as pillars. 3? Intrusion alarm system according to claim 4 in which delta. Rotating beam scanning? horizontal. 6. Intrusion alarm system according to the rev. 4 wherein said rotating beam scan? angled to form a shell-shaped exploration v 7. Intrusion alarm system according to rev. 4 wherein said rotating beam scan is used to form a wall. 8. Intrusion alarm system according to any previous rev. where a secondary power supply system is installed to overcome malfunction or sabotage of the main power supply. 9. Intrusion alarm system substantially as described here and illustrated in the attached drawing.