Views:9 Author:Site Editor Publish Time: 2019-04-18 Origin:Site
The door has two functions, the former role is cold protection and the present role is theft prevention. Doors have evolved from wooden to anti-theft doors. Supermarket covers a wide area. It is impossible to really guard against theft by relying solely on cameras. EAS Anti-theft system can effectively protect supermarket. So supermarkets have also used anti-theft doors. So what principle does the supermarkets’ anti-theft doors use to alarm the amount?
1. Principle of Radio System.
The radio system uses radio waves as transmitting and receiving signals and detects frequencies ranging from 7.x to 8.x MHz，radio signals of different frequencies are transmitted. The greatest advantage of the radio system is that the cost of the system is very low and the installation is very convenient.
2. Principle of Electromagnetic Wave.
Electromagnetic wave system uses electromagnetic wave as detection signal. It has the smallest label, cheaper price and repetitive demagnetization. However, electromagnetic wave system is susceptible to false alarm due to the influence of magnetic or metallic materials.
3. AM Principle.
The AM principle, tuning fork causes resonance at the same oscillation frequency. This physical principle implements almost zero false alarm operation. When the AM labels on the goods enter the detection area of the system, they will produce resonance. When the receiver receives four consecutive resonance signals, it will alarm. The characteristics of AM system are high anti-theft detection rate, almost zero false alarm, good anti-interference.
Through the above introduction, you should be able to understand the principle of supermarket security doors. If you need EAS anti-theft system for your supermarket, clothing stores, etc. please feel free to contact us, we will provide you with high quality products and good service.