What is the principle of the supermarket alarm?

What is the supermarket anti-theft device, what is the principle of the supermarket anti-theft device, these two issues are introduced in detail in this article.

Supermarket products generally have two kinds of anti-theft devices, one is a small magnetic strip, commonly known as "soft standard", and the other is a pin-type magnetic device, commonly known as "hard standard", which are all based on the principle of magnetic induction. Anti-theft, the alarm device at the entrance of the supermarket is also called "anti-damage door", which is equipped with a magnetic sensor. If the product passes through the damage prevention door without degaussing, it will alarm. After the customer selects the goods and pays at the checkout counter, the cashier will degauss the goods with “soft standard” and “hard standard”. If it is “soft standard”, degauss the degaussing on the cash register, if it is “ The hard label will use a special tool to hold the "hard label" and the product. In this way, the goods purchased by the customer can safely pass the "damage prevention door".

The principle of supermarket alarm

The anti-theft device has a detector. The detector is generally composed of a transmitter and a receiver. The principle is that the transmitter transmitting antenna transmits the scanning band, and an area is formed between the transmitting antenna and the receiving antenna. The receiver Then, the frequency band is taken back, and the principle of electromagnetic wave resonance is used to detect whether there is a valid tag in the area, and if it exists, an alarm is triggered.

The degaussing method is through a decoder, which is a device that disables a soft tag or a hard tag. The common unremovable soft tag on the market is generally called a non-contact decoder. It only needs to scan the product on the top of the product and scan it within 20cm. The hard tag is usually a dedicated decoder and unlocker. The "hard standard" is separated from the product for the purpose of decoding. The decoders in general supermarkets are used in conjunction with the POS laser cash register platform.