The supermarket anti-theft system is not unfamiliar to many people. We often see it when we buy things. Its use solves the problem of open sales for supermarkets. At present, the two anti-theft systems in use in the market are respectively For acoustic magnetic and radio frequency, we all know that radio frequency anti-theft doors are more prone to false alarms caused by many factors, so most of the anti-theft devices currently used are acoustic and magnetic, but sometimes the acoustic and magnetic systems will also produce false alarms. What's more, there is no anti-theft device with zero false alarms, so what are the interference factors of the acousto-magnetic anti-theft device? Next, I will introduce it to you.
The working process of the acousto-magnetic anti-theft device is simply to use the resonance phenomenon generated by the principle of the tuning fork to achieve an operation with almost zero false alarms. When the frequency of the transmitted signal is the same as the oscillation frequency of the acousto-magnetic tag, the acousto-magnetic tag is similar to a tuning fork, which will cause resonance and generate a resonance signal; when the receiver detects a continuous (adjustable) resonance signal for 4-8 times, the receiving system will alarm. In fact, the principle is very simple. Generally speaking, according to this principle, the factors that can affect the false alarm of acousto-magnetic anti-theft equipment are nothing more than items that are close to the oscillation frequency of the tag or the debugging of the sensitivity of the anti-theft device itself.
Generally speaking, the frequency that can affect the frequency of acoustic and magnetic anti-theft equipment is likely to be a large electrical equipment or a magnetic field nearby. At this time, the anti-theft door will have a long beeping phenomenon. The momentary signal frequency is likely to cause false alarms of the acousto-magnetic anti-theft equipment. The current acousto-magnetic system has more false alarms than the debugging of the machine. It is very likely that the sensitivity is too low and the sensitivity of the machine is too low There is no problem if it is increased; otherwise, it is a quality problem. It is very likely that the quality of the machine does not meet the standard or the internal parts of the machine are faulty, etc., and false alarms will occur. It is shielded by metal tin foil, has good anti-interference performance, wide protected exit, and low false alarms. It is an ideal anti-theft device on the market at this stage.