Views:2 Author:Allen Publish Time: 2018-12-29 Origin:Site
Three induction method of supermarket eas system
Supermarket eas RF system, using radio waves as the signal for transmitting and receiving, the detection frequency range is 7. x~8. x megahertz. The transmitted signal is a radio signal, which is the same signal as a mobile phone or a broadcast, but with different frequencies. The advantage of the eas RF system is that the system cost is very low and the installation is convenient. However, because the eas 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.
Supermarket eas AM system tuning fork only causes resonance when the oscillation frequency is the same. Eas AM system is the application of this physical principle, to achieve almost zero false positive operation, when the acoustic magnetic system eas tag fixed on the commodity enters the detection area of the system, it will resonate, but only received four times in the receiver. The alarm is generated after the resonance signal (once 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.
The electromagnetic wave system of the electromagnetic door system of the supermarket security door uses electromagnetic waves as the detection signal. The electromagnetic wave system has the smallest label, the label price is also cheap, and the degaussing can be repeated, but it is susceptible to false alarms due to the influence of magnetic or metallic substances. The width of the protected exit is generally around 0.9 meters. 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 allows for 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.