HackerTube / Video
Laser diode self-mixing: Range-finding and sub-micron vibration measurement
Applied Science
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.
HN points to it as a cool demonstration of cheap precision laser measurement and the origin of hacks based on self-mixing.
3 Hacker News mentions · 2019–2025