How does the anti-theft alarm at the door of the supermarket work?
(1) The detector is usually composed of two parts of the transmitter and receiver. The basic principle is to use a transmitting antenna to scan
The use of magnetic induction to the anti-theft, the supermarket door alarm device, also known as "damage to the door," which is equipped with magnetic sensors. If the goods have not been demagnetized by the loss of the door when the alarm will be.
The band is emitted and a scanning area is formed between the transmitting antenna and the receiving antenna, and the frequency band is received and restored by the receiving antenna in the receiving range, and then the effective label is found in the specific range by using the resonance principle of the electromagnetic wave A valid tag appears in the area to trigger an alarm.
(3) The decoder is a soft label failure device. Commonly used in the market is non-contact decoder, as long as the salesperson will be through the decoder within the top 20cm decoder can be decoded. Decoder can be used with POS laser cash register platform. The unlocker is a quick, easy, and easy to remove a variety of hard tags.
(2) electronic tag its internal structure is a Lc oscillation circuit, in a special way to install on the goods, only after a dedicated decoder, unlock the device to lift it. The electronic labels appear on the market are soft labels, hard tags, bottle protectors, milk powder anti-theft labels, CD / tape protection boxes and so on.
