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#laserdiode#self-mixinginterferometry#interferometer

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

Applied Science

891K subscribers • 6 videos on Hallway

YouTube
  • Recommended by 1 person: 1 on Hacker News.
  • Presented by Ben Krasnow, creator of Applied Science

Intermediate. Assumes working knowledge.

491K views7 years ago1 recommendation

HardwareElectronicsEmbedded systems

Ben Krasnow demonstrates how a plain laser diode can measure sub-micron vibrations and distance using self-mixing interferometry.

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/http://iopscience.iop.org/article/10.1088/1464-42… jameco.com/Jameco/Products/ProdDS/2120428.pdf spiedigitallibrary.org/journals/optical-engineering/volume-5… Nerd Thunder! Check them out! Dean Segovis: youtube.com/user/HackaweekTV Jeri Ellsworth: youtube.com/user/jeriellsworth Becky Stern: youtube.com/user/bekathwia Ben Krasnow: youtube.com/user/bkraz333 John Schuch: youtube.com/user/HackersBenchTV Darren Landrum: youtube.com/user/dmlandrum Joe Grand: youtube.com/user/kingpinempire Mark VandeWettering: youtube.com/user/brainwagon Alan Wolke: youtube.com/user/w2aew/ patreon.com/AppliedScience

Why it's here

1 person recommends this

What people say. Recommended as a great demonstration of using a low-cost laser diode for precise physical measurements and interfacing directly with physics.

birktjon Hacker News • Recommends

On “Open source laser microphone picks up laptop keystrokes”

Related to this Applied Science on YouTube has a pretty cool video where he demonstrates how a single laser diode can be used to measure miniscule vibrations. I wonder if this would be sufficient for a laser microphone? link to this video
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colechristensenon Hacker News • Mentions

On “Kern Microtechnik: Accurate CNC Machines [video]”

…t 30 seconds. I like to tell myself the money wasted was spent on learning lessons. The second is coming in the mail. The upshot with this method is that it can be extremely low cost and give you access to write code that interfaces directly with physics instead of somebody else's device. The idea for hacking on these things comes from Ben Krasnow link to this video and several research papers.…
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ameliuson Hacker News • Mentions

On “Lidar, optical distance and time of flight sensors”

Slightly offtopic, why is it so difficult to find a cheap and compact laser interferometer that can do sub-micron measurements? This guy gets close: link to this video But why isn't something cheap and small like this commercially available as an integrated system?
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