Brief Analysis of Composition and Work of Supermarket Security System

The working principle of the supermarket anti-theft system is to attach an electronic anti-theft tag to the small, high-value and easily stolen goods. At the exit of the shopping mall, there is an anti-theft door for inspection. When the thief steals the goods with the tag, it passes the inspection. Immediate alarm (like the boarding check at the entrance of the airport) at the door, and normal shopping will invalidate the label when passing through the checkout counter, and will not alarm. For supermarkets, clothing stores, specialty stores and other places where goods are often lost, Can greatly reduce the loss.

Radio frequency system

Radio Frequency (RF) uses radio waves as the signal for transmission and reception. The detection frequency range is 7.x~8.x MHz. The signal transmitted is a radio signal, which is the same signal as a mobile phone or a broadcast, but differs in frequency. The biggest advantage of the radio system is the very low system cost and easy installation. However, since its 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 and metal objects, which cause false alarms or non-reports of the system.

The radio system has two labels, soft and hard, that can protect most items in the mall. The distance between two bearings can not be more than 09 meters, usually used in a shopping mall with only one import and export. The radio system has two types, vertical and channel, and is used to protect department stores, clothing stores, and supermarkets.

Acoustic and magnetic systems

The tuning fork only causes resonance if the oscillation frequency is the same. The AcustoMagnetic system uses this physics principle to achieve virtually zero false alarms. When the acousto-magnetic system tag fixed on the product enters the detection area of ​​the system, resonance occurs, but only at the receiver. The alarm is issued after four consecutive resonances (once every 1/50th of a second).

The characteristics of the acousto-magnetic system are high anti-theft detection rate, almost zero false alarms, good anti-interference, and the protection of the export width of up to 3.5 meters, there are two anti-theft labels soft and hard, for most types of shopping malls can be protected, and Demagnetization can be repeated, even if the system is still working at the POS cash register.

The acousto-magnetic system includes vertical system, channel system and concealed system. There are more than 10 models to choose from, which can be widely used in department stores, supermarkets, specialty stores, audio-visual shops, grocery stores, pharmacies, etc. Office buildings and other environments.

Electromagnetic wave system

The Electromagnetic System uses electromagnetic waves as detection signals.

The electromagnetic wave system has the smallest label, the label price is also low, and the demagnetization can be repeated, but it is susceptible to a false alarm due to the influence of magnetic or metallic substances. The protected exit width is generally around 09 meters. The system will not affect magnetic objects (such as audio tapes, video tapes, magnetic cards).

The new generation of channel-type electromagnetic wave system is a software-controlled electronic anti-theft system, using digital processing technology and degaussing system, cashier monitoring, closed-circuit television monitoring system. The use of fast degaussing plates enables repeated demagnetization and high system costs. There are two types of electromagnetic wave systems: vertical and channel. The application environment is mostly in libraries, bookstores, sound shops, hotels, supermarkets, etc.

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