After 40 years of development, the Electronic article surveillance has evolved from an early single-principle single product to a multi-faceted variety of different principles, adapting to the needs of different types of stores such as department stores, supermarkets, specialty stores, and libraries. Let me introduce the main knowledge points of the Supermarket alarm.
Form of protection
Subdivided from the form of protection, it can be divided into the vertical system, concealed system, and channel system.
1.The detection system of the vertical system stands prominently at the entrance and exit of the mall and has an obvious deterrent effect in addition to the detection function.
2.The concealed system is to cover the system under the carpet or ceiling of the exit. It does not affect the overall environment of the store. It can also play the role of anti-theft protection to meet the needs of the owner and the anti-theft.
3.The channel system integrates the EAS system with the checkout counter at the exit of the supermarket to form channel-type protection, which is an effective method for realizing supermarket anti-theft.
working principle
According to the detection signal of the application, it can be roughly divided into a radio system, an electromagnetic wave system, a microwave system, a frequency dividing system, a smart system, and an acoustic-magnetic system.
(1) Acoustic magnetic system
The tuning fork only causes resonance when the oscillation frequency is the same. Acoustic magnetic system (Acusto Magnetic) is the application of this physical principle to achieve almost zero false-positive operation. When the acoustic magnetic system tag fixed on the commodity enters the detection area of the system, it will resonate, but only receive at the receiver. The alarm is issued after four consecutive resonance signals (every 1/50th of a second).
The characteristics of the acoustic-magnetic system are high anti-theft detection rate, almost zero false alarm, good anti-interference, and the protection export width can reach 3.5 m. There are two kinds of anti-theft tags, which can protect most types of goods in the mall. And can degaussing repeatedly, even if the system is still working properly next to the POS cash register.
Acoustic magnetic systems include vertical systems, channel systems, and concealed systems. There are more than 10 models to choose from. They can be widely used in department stores, supermarkets, specialty stores, audio-visual stores, grocery stores, pharmacies, and also in Office buildings and other environments.
(2) Radio system
The radio system (Radio Frequency, RF) uses radio waves as the signal for transmitting and receiving and detects electromagnetic waves with a frequency range of 7.4-8.8 MHz. The center frequency is 8.2 MHz, causing interference at 8.5 MHz caused by the tag, thereby causing an alarm. The biggest advantage of the radio system is that the system cost is very low and the installation is convenient. However, because the anti-theft tag is a toroidal coil type, the system is susceptible to interference from some items, such as electronic products such as cash registers, metal objects, etc., causing false positives or failures of the system.
The radio system has both soft and hard labels that protect most of the items in the mall. The distance between the two supports is generally not greater than 0.9 m, usually used in shopping malls with only one import and export. The radio system has two types, vertical and channel, for protecting department stores, clothing stores, supermarkets, etc.
(3) Electromagnetic wave system
The electromagnetic system (Electromagnetic System) uses electromagnetic waves as a detection signal. The electromagnetic wave system has the smallest label, the label price is also cheap, and can be degaussed repeatedly, but it is susceptible to false alarms due to the influence of magnetic or metallic substances.
The system does not affect magnetic items such as audio tapes, video tapes, and magnetic cards. The new generation of channel-type electromagnetic wave system is a software-controlled electronic anti-theft system that uses digital processing technology and degaussing system, cashier monitoring and closed-circuit television monitoring system.
The use of a fast degaussing plate enables repeated degaussing and high system cost. Electromagnetic wave systems are available in both vertical and channel types. The application environment is mostly in libraries, bookstores, sound stores, hotels, supermarkets, etc.
(4) Microwave system
Microwave System uses microwave as the detection signal, which is not easily interfered by the surrounding environment. It can be flexibly concealed (such as hidden under the carpet or suspended from the ceiling), which has the advantages of being suitable for interior decoration and beauty.
However, due to the large scope of Shengying, it is not possible to arrange goods in a certain area. This will limit the use of space for merchants with a lot of land, so it is suitable for large department stores and large music stores and fashion stores.
(5) Frequency division system
SplitFrequency is an anti-theft system that uses high-tech crossover technology and ultra-low frequency radio wave signals.
When an anti-theft tag enters the detection area, the tag receives the signal transmitted from the transmitting device, divides it into half, and then transmits the half-divided information to the receiver, only when the receiver receives half of the signal. An alarm is issued to effectively avoid interference from other radio waves.
The system has light weight, small size, low price, stable performance, high detection rate, good anti-interference, and is not easy to cause false alarms. There are two kinds of products, vertical and concealed. It is an ideal anti-theft system for clothing and clothing stores.
(6) Intelligent system
The unique technology of the smart system application is a system that is internally controlled by an integrated circuit, battery driven, and integrated with hard tags and alarms.
The system automatically issues an alarm when the tag is picked up or taken out of the store with the item. The system protects goods throughout the mall from false positives and labels that can be reused without damaging the merchandise.
Used to protect valuables such as fashion, leather, robes, etc.
(7) Failure principle system
The anti-theft system of the destruction principle is a hard tag or a magnetic lock. The hard tag contains ink. When the thief tries to remove the hard tag, the hard tag will eject ink, contaminating the merchandise and the thief's body.
The magnetic lock is not easy to dismantle. Forcibly dismantled will destroy the goods. It is easy to use, has a good deterrent effect, and has low cost. It can be applied to clothing, glasses, jewelry, ties, silk and other products, and the labels can be reused.
Conclusion
In addition to the electronic goods Anti-theft system, closely related to the anti-theft of the mall is the closed-circuit television monitoring system. The CCTV surveillance system monitors what is happening in the mall and discovers suspicious events, deterring and deterring.
Compared with the electronic anti-theft system, the advantage is that it can not only effectively monitor the situation in the mall, but also use the video tape to record the event or theft process as a basis for future tracing and evidence collection.
This can more effectively prevent internal and external thieves from committing crimes, improve the anti-theft effect, and reduce the loss of retail goods.
