Sunday, November 29, 2015

How anti-theft tags work - magnetostriction

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.

Support Applied Science:

Special thanks for your support:
Matthew Hill
Erik Saathoff
Max Loutzenheiser
(better credits titlescreen in the next video!)


Sunday, November 1, 2015

Your toothbrush is worn-out!

See how your trusty toothbrush becomes worn out.

Special thanks to Harri Lähteenmäki  and Johannes S. Zwilling for sending me the smooth zoom footage of the tungsten filament, and showing me how to use After Effects to get a much better effect.  I really appreciate it!

Support Applied Science:

Macrophotgraphy with a microscope objective: