What is the principle of commodity anti-theft alarm system in big supermarkets? Please tell the insiders in detail.

The anti-theft alarm system in supermarkets can be distinguished by detecting signals, which can be roughly divided into acousto-magnetic system, radio system, electromagnetic wave system, microwave system, frequency division system, intelligent system and damage principle system.

○ Acoustomagnetic system

The tuning fork will only cause * * * vibration if the oscillation frequency is the same. Acousto-magnetic system (Acousto-magnetic) has realized almost zero false alarm by applying this physical principle. When the acousto-magnetic system tag fixed on the commodity enters the detection area of the system, it will generate * * * vibration, but it will give an alarm only after the receiver receives the * * * vibration signal for four consecutive times (once every 1/50 seconds).

Acousto-magnetic system is characterized by high anti-theft detection rate, almost zero false alarm, good anti-interference, and the width of protection exit can reach 3. 5 meters. There are two kinds of anti-theft labels, which can protect most kinds of goods in shopping malls and can be degaussed repeatedly. Even at the POS cash register, the system can still work normally.

Acousto-magnetic system includes vertical system, channel system and concealed system. There are many models of 10 to choose from, which can be widely used in department stores, supermarkets, specialty stores, video stores, grocery stores, pharmacies and office buildings.

Radio system

Radio frequency (RF) uses radio waves as transmitting and receiving signals, and the detection frequency ranges from 7. X to 8. X megahertz. The biggest advantage of wireless system is its low cost and convenient installation. However, because its anti-theft tag is a ring coil type, the system is easily disturbed by some items, such as electronic products such as cash registers and metal objects. , resulting in false alarm or no alarm.

The radio system has two kinds of labels, soft and hard, which can protect most items in shopping malls. The distance between the two brackets is generally not more than 0.9 meters, which is usually used in shopping malls with only one entrance and exit. There are two kinds of radio systems, vertical and tunnel, which are used to protect department stores, clothing stores and supermarkets.

Electromagnetic wave system

Electromagnetic wave systems use electromagnetic waves as detection signals.

The tag of electromagnetic wave system is the smallest, and the tag price is cheap. It can be demagnetized repeatedly, but it is easy to be affected by magnetic or metallic substances and produce false positives. The width of the protective exit is generally about 0.9 meters. The system will not affect magnetic objects (such as audio tapes, video tapes and magnetic cards).

The new generation channel electromagnetic wave system is an electronic anti-theft system controlled by software, which adopts digital processing technology and integrates with degaussing system, cashier monitoring and closed-circuit television monitoring system. The fast degaussing board can be used for repeated degaussing, and the system cost is high. There are two kinds of electromagnetic wave systems: vertical and channel. The application environment is mostly in libraries, bookstores, musical instruments, hotels, supermarkets and so on.

Microwave system

Microwave system uses microwave as detection signal, which is not easily disturbed by the surrounding environment. It can be installed flexibly and concealed (for example, hidden under the carpet or hung on the ceiling), and has the advantages of being suitable for decoration and beauty in the store. However, due to its wide application range, it is impossible to arrange goods in a certain area, which will limit the use space of businesses with land and money, so it is suitable for large department stores, music stores and fashion stores with large stores.

Frequency division system

Frequency division system is an anti-theft system using high-tech frequency division technology and ultra-low frequency radio wave signals. When the anti-theft tag enters the detection area, the tag receives the signal from the transmitter, divides it into two halves, and then sends the information divided into two halves to the receiver. Only when the receiver receives half of the signal will it give an alarm, which can effectively avoid the interference of other radio waves.

The system has the advantages of light label, small size, low price, stable performance, high detection rate, good anti-interference, and not easy to cause false positives. Products are divided into two types: vertical and hidden. It is an ideal anti-theft system for clothing stores.

Intelligent system

Intelligent system uses unique technology, which is controlled by integrated circuit, driven by battery, and integrated with hard tag and alarm group. When the label is pried or taken out of the mall with the goods, the system will automatically alarm.

The system can protect the goods in the whole shopping mall, and the labels can be reused without damaging the goods. Used to protect valuables, such as fashion, leather, fur, etc.

Fault principle system

The anti-theft system that breaks this principle is a hard tag or magnetic lock. There is ink in the hard label. When a thief tries to take off the hard label, the hard label will spray ink, polluting the goods and the thief's body. Electromagnetic locks are extremely difficult to remove, and forced removal will damage the goods. Convenient use, good deterrent effect and low cost. It is used in clothing, glasses, jewelry, ties, silk fabrics and other commodities. Labels can be reused.

In addition to the anti-theft system of electronic products, there are also closed-circuit television (CCTV) and intrusion alarm system (IAS) closely related to the anti-theft of shopping malls. Closed-circuit television monitoring system can monitor the situation in shopping malls and find suspicious events, which can play a deterrent role. Compared with the electronic anti-theft system, its advantage lies in that it can not only effectively monitor the situation in the shopping mall, but also record the incident or theft process through video tape as the basis for tracing and collecting evidence in the future. Conditional shopping malls can combine electronic anti-theft system with closed-circuit television, which can effectively prevent internal and external thieves from committing crimes, improve the anti-theft effect and reduce the loss of retail goods. Intrusion alarm system is an electronic system or network that uses sensor technology and electronic information technology to detect and indicate illegal entry or attempted illegal entry into fortified areas (including deliberately triggering emergency alarm devices in the face of hijacking or robbery or other critical situations), processes alarm information and sends out alarm information.