Laser Diode Self-Mixing for Range and Vibration Measurement
Applied Science · Demo · 28 min · 2018 · YouTube title: Laser diode self-mixing: Range-finding and sub-micron vibration measurement
Why it's here
HN points to it as a cool demonstration of cheap precision laser measurement and the origin of hacks based on self-mixing.
What it covers
Ben Krasnow of Applied Science shows that a plain laser diode can measure sub-micron vibrations from centimeters away using self-mixing interferometry, and can also be used for range-finding.