FunHow does an anti-theft device work?

How does an anti-theft device work?

The anti-theft systems installed at the exit of shops are of two types. The first of them consists of a magnetic label that is pasted on the articles, and its operation is based on the detection of the disturbance of a magnetic field.

The sticker includes a tiny coil that produces a local magnetic field when it enters the magnetic field of the detector, the two metal arches located at the exit of the establishment. The magnetic area is generated by the electric current flowing through the coil . If the tag has not been deactivated by a clerk, it causes a magnetic field alteration that triggers the alarm.

The second system consists of a clip or a plastic box that hooks or encloses the article and conceals a miniature radio transmitter made up of a coil of copper wires and various electronic components . When the protector crosses the magnetic field of the detector located at the exit of the store, the loop produces an electric current that feeds the electronic components, and these generate a radio signal that is captured by the receiver that activates the alarm.

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