Views:1 Author:Allen Publish Time: 2019-10-21 Origin:Site
Can foil paper shield the eas anti-theft security door alarm in supermarkets? [Bohang China]
The false alarm of the supermarket security door is related to many external factors, such as soft and hard labels, the surrounding electrical equipment, and whether there is an electric field around it, which will affect the delay of the eas anti-theft security door alarm receiving signal and affecting the alarm. Edited in the forum to see such a question, "Silver foil can shield the eas anti-theft security door alarm of the supermarket?", all kinds of arguments are there, Xiaobian is not very clear, after consulting relevant information and asking the department technical staff, they have their own insights, let me share it now.
Metal is a function of anti-shield interference. Tin foil paper is also a metal. Therefore, it is a function of anti-shield interference, but the effect is not great. Can you shield the anti-theft door alarm signal of the supermarket? We must first analyze the working principle of the supermarket anti-theft alarm door.
The supermarket anti-theft device used in the market today is either an AM or a RF or an EM. The transmitting and receiving are all electromagnetic signals, and the tin foil paper can shield the electromagnetic signal, but It is still difficult, but not impossible, to block the alarm of the eas anti-theft security door alarm.
Tin foil paper is a metal foil conductive material with electromagnetic shielding effect, so it can shield electromagnetic signals. There is no direct relationship between the shielding effect and the thickness, but it is related to the construction of the shielding material itself.
In order to shield the signal of the supermarket burglar alarm door, you may have to make the foil paper large enough thick enough to conform to the shielded construction shape, and then surround the interference source that may affect the eas anti-theft security door alarm to prevent interference with the electromagnetic field. Diffusion; also use tin foil paper to surround the entire receiving circuit, equipment or system of the supermarket security door to prevent them from being affected by external electromagnetic fields. This way you may be able to use the foil paper to shield the eas anti-theft security door alarm of the supermarket.