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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.
sci-hub.tw/iopscience.i...
www.jameco.com/Jameco/Product...
www.spiedigitallibrary.org/jo...
Nerd Thunder! Check them out!
Dean Segovis: / hackaweektv
Jeri Ellsworth: / jeriellsworth
Becky Stern: / bekathwia
Ben Krasnow: / bkraz333
John Schuch: / hackersbenchtv
Darren Landrum: / dmlandrum
Joe Grand: / kingpinempire
Mark VandeWettering: / brainwagon
Alan Wolke: / w2aew
/ appliedscience