Systems mounted for additional protection of the house indoors, for the most part, have one significant drawback. Their action is aimed at detecting unauthorized entry into the apartment / house, when the thief is already inside, which gives the attacker the opportunity to take advantage of a short time interval from the moment the protection is triggered to the arrival of the security service. Therefore, the work of manufacturers of such systems is aimed at reducing the time interval from penetration to the arrival of a signal. Experts consider perimeter signaling to be one of the most promising in this regard.
Fencing the area around the perimeter will allow you to detect an intrusion at a very early stage. After all, before entering the house, the attacker enters the site, where he makes certain movements, which are recorded by special sensors.
Security system - what is it?
The object is fenced around the perimeter by mounting a metal mesh, erecting a brick barrier, using another equally reliable type of material to protect the house and its surrounding area. This is the first obstacle for someone who is trying to get inside the protected object. Contact with the fence is indispensable, so detecting a thief with an electronic perimeter burglar alarm is the best option.
If there is a version that the fraudster will be able to avoid contact with the fence, it is necessary to additionally mount volumetric sensors, which play a role in the subsequent line of defense of the territory.
The notification systems that the systems of this type are equipped with can not only record certain actions on the part of a person, but also indicate the fact of the appearance of an unauthorized person in a controlled area. The signals they send to the system are carefully analyzed by the processor, and if the threshold value is reached, the system generates an alarm notification.
Perimeter Security Features
This is what a perimeter alarm should look like:
- Able to detect an intruder at an early stage of penetration into the territory, before he appears at the facility.
- Properly mounted: the sensors should not be visible to others, and the cable should be placed along the system contours of the territory, which will avoid the formation of "blind spots" on the site.
- To be immune to external influences - the movement of pets, interference,vibrations.
- Highly sensitive to the intruder's movements, and therefore technically upgraded according to the latest IT developments.
Perimeter warning systems and their varieties
Equipment of this type is divided into two groups: radio-controlled devices and radio wave installations.
The package includes the first receiver and transmitter of microwave signals, which are responsible for the formation of the detection area, visually resembling an ellipsoid of revolution. Its length is equal to the distance between the blocks of the system, and in some cases the diameter can reach several meters.
This type of signaling is in most cases used in areas where the organization of direct visibility between the system units does not cause difficulties. With this development of events, it is assumed that the zone should not be planted with garden and park crops.
Features of radiobeam equipment
The installation of radio-beam devices is carried out along the perimeter of the fence, but it is also intended for installation in unfenced areas, since their main task is to identify a hostile freely moving subject in the radio wave propagation zone.
Among the shortcomings of such a system, the reduced sensitivity of the receiver-transmitter at a short distance is noted. This leads to the formation of "blind zones", which is highly undesirable in the protection of the territory. This effect is also observed at a distance of 30 cm from the ground, which allows you to move freely by crawling and go unnoticed by the perimeter alarm.
Devices are installed on the ground or fences. When choosing the first of the mounting options, please note that the condition must be met: the territory must first be cleared of vegetation and objects blocking the passage of the signal.
Important! The manufacturer does not recommend using such an alarm in places where unauthorized people (maintenance personnel, technicians) or equipment are expected to be.
What is a radio wave system
The radio wave system consists of two wires running parallel to each other, which are connected at the output and input to the receiver and transmitter. A so-called sensitive zone is formed around the "open antenna". Its diameter directly depends on the location of the system cables.
When an unauthorized person appears in the zone at the exit from the system, the signal, generated, acquires an alarming character.
Please note that if you choose this option, the wires will need to be placed on special risers or at the top edge of the fence. There are models of radio wave security systems for unenclosed areas on the market. In this case, the cable is placed under a layer of soil up to 30 cm.
Installation of the system underground is its advantage, as it makes it hidden and independent of adverse weather conditions. In addition, the perimeter of the safe zone exactly matches the fence line and is not affected by uneven terrain.
Overviewperimeter alarm systems: Gyurza
The Gyurza perimeter alarm works according to the vibration principle. It is equipped with a special triboelectric cable mounted on the fence. In this case, the end piece is installed on the sensitive element on the one hand and the signal processing device to which it is attached, on the other.
When the alarm barrier is affected, the amplitude-phase characteristic is amenable to change. This reaction is registered by the perimeter alarm and leads to the closing of the output relays, which are located on the BOS board. The security service is informed through special software.
The cost of the system is fully justified, it is among the budget options. Installation of the Gyurza alarm system does not require special skills and can be performed by specialists of organizations providing such services.
Security system "Bolid": features
Perimeter burglar alarm of this model is used by many large facilities. It is developed on the basis of a triboelectric cable, which makes the system ultra-reliable against such types of unauthorized entry as:
- climb;
- digging;
- break.
"Bolid" - a perimeter alarm suitable for mounting on any fences, can also be mounted underground.
Advantages of the security system
Ka number of advantages of the system include:
- reliable perimeter protection;
- low cost, which is attributed to a number of competitive advantages;
- modular structure;
- no blind spots;
- possibility of early detection of a fraudster;
- easy to install.
Having already considered two of the three perimeter alarm systems, we can conclude that the two previous options are almost identical.
Fiber-optical security system "Raven"
The principle of operation is based on the registration of the radiation of a laser device passing through the structure of a multimode optical fiber by a receiver responsible for registering redistributed light fibers by acting on a light cable.
When an alarm occurs, the evidence of its fixation is transferred to the software, with which a detailed report on the nature of the impact can be obtained. Each of the incoming alarms is compared with the actual violations contained in the alarm database. Perimeter signaling "Raven" is mainly mounted on metal barriers.
The advantages of the security system include ease of installation and insensitivity to electromagnetic radiation.
What should not be forgotten when choosing a system
The choice of signaling depends on the type of barrier. So, on rigid fences, on which reinforcing barbed tape can be additionally installed, it is better to mount a POS developed on the basis oftriboelectric cable.
For straight fences, it is better to choose a radio wave alarm. At the same time, do not forget about the arrangement of exclusion zones and the elimination of the possibility of a false alarm of the security system.
Infrared sensors are suitable for mounting around the perimeter of the roof of a building, alignment, concrete platform. In such places, the possibility of creating "blind spots" is less.
These are just generalized recommendations. To choose the right perimeter signaling project, it is better to consult with a specialist. After all, the work of the security system is directly affected by climatic, man-made and natural factors.
A perimeter security alarm system installed around a building is the best way to protect a property and its surrounding area from unauthorized entry.
