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 period from the moment the protection is triggered until 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 receipt of a signal. One of the most promising in this regard, experts consider the perimeter alarm.
Fencing the site around the perimeter will reveal an intrusion at an early stage. After all, before entering the house, the attacker enters the area where he makes certain movements, which are recorded by special sensors.
Security system - what is it?
The object around the perimeter is fenced, mounting a metal mesh, erecting a brick barrier, using another no less reliable type of material to protect the house and the surrounding area. This is the first obstacle for someone trying to get inside the guarded object. Without contact with the fence can not do, because the detection of a thief with electronic perimeter security alarm is the best option.
If there is a version that the fraudster will be able to avoid contact with the fence, you have to additionally mount volumetric sensors, which play a role in the subsequent line of defense of the territory.
The notification systems with which the systems of this type are equipped can not only record certain actions on the part of the person, but also testify to the fact of the appearance of an unauthorized person in the controlled area. The signals that they transmit to the system undergo a detailed analysis by the processor, and if the threshold value is reached, the system generates an alarm notification.
Perimeter Security System: Features
Here is what the perimeter alarm should be:
- Able to identify an attacker at an early stage of penetration into the territory, before it appears at the facility.
- Properly mounted: the sensors should not be visible to others, and the loop is placed along the system contours of the territory, which will avoid the formation of "blind zones" on the site.
- Be immune to external influences - the movement of pets, interference, vibration.
- Highly sensitive to the movements of the attacker, and therefore technically modernized 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 first includes a receiver and transmitter of superfrequency signals, which are responsible for the formation of a detection area that visually resembles 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 blocks of the system 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 radio beam equipment
The installation of radio-beam devices is performed along the perimeter of the fence, but it is also intended for installation on unshielded areas, since their main task is to identify a hostile free-moving subject in the radio wave propagation zone.
Among the disadvantages of such a system, a reduced sensitivity of the transmitter-receiver at a short distance is noted. This leads to the formation of "blind spots", which is extremely undesirable when protecting the territory. This effect is also observed at a distance of 30 cm from the ground, which allows you to move freely crawling and go unnoticed by the perimeter alarm.
Devices are installed on soil or barriers. When choosing the first of the mounting options, keep in mind that the condition must be met: the territory must first be cleaned of vegetation and objects blocking the signal passage.
Important! The manufacturer does not recommend the use of such an alarm system in places where strangers (service personnel, technicians) or a technician are suspected to be.
What is a radio wave system
The radio wave system consists of two wires passing in parallel with respect to each other, which are connected to the receiver and transmitter at the output and input. Around the "open antenna" is formed the so-called sensitive area. 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 unshielded territories on the market. In this case, the cable is placed under a layer of soil up to 30 cm.
Installing 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 corresponds exactly to the fence line and does not depend on uneven terrain.
Overview of perimeter alarm systems: Gyurza
The “Gyurza” perimeter alarm is operating according to the vibration principle. It is equipped with a special triboelectric cable mounted on the fence. In this case, a terminal part is installed on the sensitive element on the one hand and a signal processing device to which it is connected, on the other.
When the signal boom lends itself to impact, the phase-amplitude response lends itself to change. This reaction is recorded by the perimeter alarm and leads to the closure of the output relays, which are located on the BFB board. The security service is informed through special software.
The cost of the system is fully justified, is among the budget options. Installation of the Gyurza alarm does not require special skills and can be performed by specialists of organizations providing such services.
Security system "Bolid": features
The perimeter burglar alarm of this model is used by many large objects. It is developed on the basis of a triboelectric cable, which gives the system super reliability with such types of unauthorized entry as:
"Fireball" - perimeter alarm, suitable for installation on any fence, can also be mounted underground.
Advantages of the security system
Some of the advantages of the system include:
- reliable perimeter protection;
- low cost, which is attributed to a number of competitive advantages;
- modular structure;
- lack of "blind spots";
- the possibility of early detection of a fraudster;
- simplicity in installation.
Having already examined two of the three perimeter alarm systems, we can conclude that the two previous options are arranged almost identically.
Fiber optic security system "Raven"
The principle of operation is based on detecting the radiation of a laser device passing through the structure of a multimode optical fiber with a receiver responsible for registering redistributed light fibers by acting on the light cable.
When an alarm occurs, evidence of its fixation is transferred to software, with which you can get a detailed report on the nature of the impact. Each of the incoming signals is compared with the actual violations contained in the alarm database. The Raven perimeter alarm is mainly mounted on metal barriers.
The advantages of the security system include ease of installation and insensitivity to electromagnetic radiation.
What you can’t forget when choosing a system
The choice of alarm depends on the type of fence. So, on rigid fences, on which you can additionally install a reinforcing barbed tape, it is better to mount a PIC developed on the basis of triboelectric cable.
For straight-line fences, it is better to choose a radio wave alarm. At the same time, do not forget about arranging exclusion zones and eliminating the possibility of false alarms of the security system.
Infrared sensors are suitable for installation around the perimeter of the roof of a building, site, concrete site. In such places, the possibility of the formation of "blind spots" is less.
These are just general recommendations. To select the perimeter alarm project correctly, it is better to consult with a specialist. Indeed, the operation of the security system is directly affected by climatic, technogenic and natural factors.
The perimeter security alarm system installed around the building is the best way to protect the facility and the surrounding area from unauthorized entry.