Acousto-magnetic Tag

Acousto-magnetic Tag

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

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Caption: Acousto-magnetic electronic article surveillance (EAS) tag. Such tags are placed inside or outside merchandise packages to prevent shoplifting. Inside the tag has a strip of ferromagnetic magnetostrictive metal. When passed through a detector that emits periodic magnetic bursts at 58 kHz the strip starts to vibrate causing a change in magnetization and induces an AC voltage in the receiver antenna.

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Keywords: anti-theft, device, eas, electronic article surveillance, ferromagnetic, goods, label, magnetoelastic, magnetostriction, magnetostrictive, merchandise, package, security, shoplifting, strip, tag, technology, theft

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