2019年1月3日星期四

Acousto-magnetic systems ?


Acousto-magnetic systems ?


These are similar to magnetic tags in that they are made of three strips, two strips of amorphous metal and a strip of ferromagnetic material. They differ in that these strips are not bound together but free to oscillate mechanically. Also the tag is active when the material is magnetized. The detectors use a 58 kHz magnetic field which induces mechanical resonance by magnetostriction . 

When the excitating field is turned off, these tags continue to oscillate mechanically, which produces a magnetic signal because of the magnetized second strip. This signal triggers the alarm. These tags are thicker than magnetic tags and are thus seldom used for books. However they are relatively inexpensive and have better detection rates (fewer false positives and false negatives ) than magnetic tags .
Cobra Tech Co.,ltd

Many products need to be affixed with anti-theft tags before entering supermarkets/chain stores. We are a supplier of anti-theft tags. If you need a security tag, please contact us.

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Frank Fu
Cobra Tech Co.,Ltd
ShunDe,FoShan,GuangDong,528300  China
Tel:+86 757-63928676   



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