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. http://sci-hub.tw/http://iopscience.iop.org/article/10.1088/1464-4258/4/6/371/pdf https://www.jameco.com/Jameco/Products/ProdDS/2120428.pdf https://www.spiedigitallibrary.org/journals/optical-engineering/volume-57/issue-05/051506/Overview-of-self-mixing-interferometer-applications-to-mechanical-engineering/10.1117/1.OE.57.5.051506.full?SSO=1 Nerd Thunder! Check them out! Dean Segovis: https://www.youtube.com/user/HackaweekTV Jeri Ellsworth: https://www.youtube.com/user/jeriellsworth Becky Stern: https://www.youtube.com/user/bekathwia Ben Krasnow: https://www.youtube.com/user/bkraz333 John Schuch: https://www.youtube.com/user/HackersBenchTV Darren Landrum: https://www.youtube.com/user/dmlandrum Joe Grand: https://www.youtube.com/user/kingpinempire Mark VandeWettering: https://www.youtube.com/user/brainwagon Alan Wolke: https://www.youtube.com/user/w2aew/ https://www.patreon.com/AppliedScience