With the advancement of technology and the improvement of living standards, family safety has once again escalated. As the first line of defense against intrusion security, Zhoujie plays a key role in family safety. So what are the perimeter anti-invasion products we usually see? What are the different characteristics? Today, Xiaobian will take you to a brief look at the huge perimeter alarm family in Europe!
The first introduction is our C-bit big brother " pulse-type electronic fence ."
It is mainly composed of two parts: the pulse emission and alarm controller and the electronic fence. It uses a very low frequency pulse high voltage to give the intruder a short shock warning and shake without hurting the intruder. Its ability and motivation to climb the fence.
Product performance:
a. Blocking and deterrent effect
b. Low false positive rate and strong anti-interference ability
c. The perimeter electronic fence can be erected with the terrain, and the gates and corners can be installed.
Then it is the " tension electronic fence " that is suitable for various places and is favored by the school.
The tension fence system is designed to be mechanically inductive. The perimeter is composed of wire and column nets that are tensioned in parallel according to a certain tension. Generally, it is a zone every 60 meters. Vertically collected signal iron is installed on the middle detector column of each zone. The wire is connected to the detector. The detector is connected to the control center of the system with signal wires. When there is an invasion, its force causes the current balance to be destroyed and perceived by the detector. Climbing, cutting, pulling up, and damage to the equipment can trigger an alarm and notify the system control center via the detector.
Product performance:
a. Free from interference from light, electromagnetic waves and electromagnetic fields
b. The tension fence system has the characteristics of self-balancing and continuous arming. After the perimeter tensioning wire is destroyed, the system can still alarm the next damage under the new self-balancing state before repairing. This feature prevents the entire system from being paralyzed by night wire damage due to wire damage.
Both of the above detectors are grafted on the wall surface for blocking and anti-intrusion alarms, while the " vibration cable " is a product that is attached to the wall.
Mainly because it uses an electret vibration cable as a sensor, and an electret vibration cable is a coaxial cable with a preset charge after special charging. In use, the electret cable is fixed on the fence or the wire mesh, one end of which is connected to the alarm control circuit and the other end is connected to the load resistor. When an intruder looks through the grid, net or cut grid, net, the cable generates an analog signal voltage due to vibration, which can trigger an alarm.
Product performance:
a. Easy to install, can be installed on the top of the wall barbed wire or fence
b. Due to the flexibility of the cable, the wiring is convenient and flexible, and it is suitable for the perimeter of the complex terrain.
C. Climbing protection on any outside guardrail
The above three types of perimeter anti-intrusion devices are designed to prevent intrusion under the premise of visible to the naked eye, but the product described below can be used as both a visible anti-intrusion device and a stealth anti-intrusion device. what! Let's take a look!
It is a " vibrating fiber ", commonly known as "fiber fence", there are two types of anti-zone type and positioning type. The installation method is hanging net or buried. The principle is to use the optical fiber that is sensitive to external vibration and pressure and has sensing function as the sensing medium, which combines “transmission†and “sensingâ€, and the role of the sensing fiber in external physical factors (such as motion, vibration and pressure). Next, change the transmission parameters (phase, wavelength, power, etc.) of the light in the fiber to detect and alarm external vibration and pressure.
Product performance:
a. Very sensitive to the vibration frequency generated by intrusion attempts such as climbing and shearing fences
b. Using optical fiber as the sensing medium, strong anti-interference ability
c. Locate the intrusion point and quickly burglar.
Introducing so many external anti-intrusion devices, let's take a look at what are the "invisible" anti-intrusion devices!
Under my hand, I would like to introduce the " leakage cable " similar to the "buried" principle of the "vibrating fiber" above.
The leaked coaxial cable is used as a sensor, consisting of two leaky cables buried in the perimeter and a transmitter and receiver. The leaky cable is a coaxial cable having a special structure in which a slot having a certain shape is periodically formed in the longitudinal direction on the outer conductor of the ordinary coaxial cable. The space between the two leaking cables forms an area of ​​detection of an elliptical electromagnetic field. When someone enters the detection zone, it will interfere with the electromagnetic coupling of the detection zone, and the electromagnetic wave energy received by the receiving cable will change, thereby generating an alarm signal.
Product performance:
a. is a concealed perimeter defense system, generally buried underground or installed in the wall, is an invisible detection field, the intruder can not detect the existence of the detection system, can not avoid or destroy the system
b. The cable can surround the perimeter of any shape of the warning zone, and is not limited by terrain, uneven ground and other factors.
c. Not affected by the climatic environment such as ambient temperature, temperature, wind and rain
d. Because it is buried underground, no interference factors, basically no maintenance
As the earliest perimeter detector, the " infrared radiation detector " also has a certain status!
By using the principle of invisible infrared light, a guardrail composed of a plurality of infrared gratings invisible to the naked eye is formed between the light projector and the light receiver, and as long as two adjacent infrared rays are blocked, an alarm signal is generated and automatically sent out. alarm.
Product performance:
a. Easy to install
b. When the power line or signal line of the invisible anti-theft network receiving end is cut, the alarm signal output circuit will automatically output the wireless alarm signal.
The " microwave radiation detector " similar to the "infrared radiation detector " is also a peripheral alarm device that everyone is concerned about!
It is composed of a transmitter and a receiver, and forms a three-dimensional invisible microwave detecting area between the transmitter and the receiver during operation, and uses the field interference principle or the beam blocking principle to detect the intruder. When someone breaks into the protection zone and blocks the microwave detection beam, the system generates an alarm signal.
Product performance:
a. The microwave operating frequency is 10 GHz, away from the spectrum, and is not affected under bad weather conditions.
b. The human eye is completely invisible, intangible, and confidential.
No installation requirements, can be installed anywhere
These are just a few kinds of perimeter alarm products for "invisible" prevention. In our daily life, which kind of perimeter products are chosen to protect ourselves also needs to be selected according to the surrounding environment of the place of residence.
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