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.

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


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

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!  http://www.videocopilot.net/tutorials/earth_zoom/

Support Applied Science: https://www.patreon.com/AppliedScience

Macrophotgraphy with a microscope objective: https://www.youtube.com/watch?v=HVSjUW2qQ6U

Ruby laser (and other projects) follow-up

The 8KJ ruby laser in action!  Also, see some other Applied Science projects and what is coming next.

NightHawkInLight on youtube:  https://www.youtube.com/user/Nighthawkinlight

Ben on Embedded.fm: http://embedded.fm/episodes/119

Ruby Laser design process:  https://www.youtube.com/watch?v=VSdUQ4oNKiI

Cookie Perfection machine: https://www.youtube.com/watch?v=8YEdHjGMeho

DIY SEM:  https://www.youtube.com/watch?v=VdjYVF4a6iU

Support Applied Science on Patreon:  https://www.patreon.com/AppliedScience

Smooth zoom video from SEM

I manually interpolated the sequence from about 15 single frames from the SEM.  Smooth zooming is not possible on the instrument natively.

How to choose a cleaning solution

A general overview of cleaning solvents and techniques.

Solvent selection and effectiveness:  http://www.productionmachining.com/articles/selecting-solvents-for-precision-cleaning

Dan Gelbart on coatings and surface cleaning:  https://www.youtube.com/watch?v=x7onZGqrYyY

https://en.wikipedia.org/wiki/Kauri-butanol_value

http://cool.conservation-us.org/coolaic/sg/bpg/annual/v03/bp03-04.html