Applied Science

How anti-theft tags work - magnetostriction (2015x21)

Udgivelsesdato: Nov 30, 2015

Anti-theft tags contain a tiny mechanical oscillator that is activated by a magnetic field. The detectors at a shop's doorway can detect the oscillation magnetically. The tag can be activated and deactivated by magnetizing or demagnetizing it, respectively. Special thanks for your support: Matthew Hill Erik Saathoff Max Loutzenheiser (better credits titlescreen in the next video!) Support Applied Science: https://www.patreon.com/AppliedScience Sources: http://www.metglas.com/products/magnetic_materials/2826mb.asp https://www.google.com/patents/WO1999013442A1?cl=en&dq=magnetostrictive+marker&hl=en&sa=X&ved=0ahUKEwjT8bCCtLLJAhVP9GMKHYThCY8Q6AEIMjAD https://patents.google.com/patent/WO2008032274A2/en?q=magnetostrictive&q=amorphous&q=theft https://www.google.com/patents/US4510489?dq=4,510,489&hl=en&sa=X&ved=0ahUKEwi0x_SosbLJAhVJyWMKHbl_AI4Q6AEIHDAA https://www.google.com/patents/US4298862 https://en.wikipedia.org/wiki/Magnetostriction