Sunday, December 9, 2018

Laser diode self-mixing: Range-finding and sub-micron vibration measurement

A plain laser diode can easily measure sub-micron vibrations from centimeters away by self-mixing interferometry!  I also show how this technique can be used for range-finding.

Nerd Thunder!  Check them out!
Dean Segovis:
Jeri Ellsworth:
Becky Stern:
Ben Krasnow:
John Schuch:
Darren Landrum:
Joe Grand:
Mark VandeWettering:

Sunday, November 18, 2018

MEMs oscillator sensitivity to helium (helium kills iPhones)

I tested the 32KHz MEMs oscillator used in some phones, and discovered that just a 2% helium environment will cause the oscillator to fail.  I also do a teardown of the MEMs device, and inspect it under the electron microscope.

iFixit blog post:  and vid:

Original thread about MRI facility and iPhone failure on Reddit:

MEMs silicon encapsulation:

Applied Science on Patreon:

Sunday, August 19, 2018

Vintage electrical tech - Weston Sensitrol Relay

This vintage electrical meter is incredibly sensitive, and latches relay contacts with just 18 nanowatts!

Link to old Weston advertisement from 1950's: