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What's really interesting about these piezoelectric ultrasound emitters (Not far off from what you see in novelty fog fountains with the little waterfall and ma

What's really interesting about these piezoelectric ultrasound emitters (Not far off from what you see in novelty fog fountains with the little waterfall and maybe some elves and mushrooms), in different arrangements, are actually capable of something called acoustic levitation of small objects - and what's more this is actually something you can DIY as well https://www.youtube.com/watch?v=yVDWrWpaBho https://www.youtube.com/watch?v=yVDWrWpaBho https://www.instructables.com/Acoustic-Levitator/ https://www.instructables.com/Acoustic-Levitator/ https://pubs.aip.org/aip/rsi/article/88/8/085105/962938/TinyLev-A-multi-emitter-single-axis-acoustic https://pubs.aip.org/aip/rsi/article/88/8/085105/962938/Tiny... https://www.youtube.com/results?search_query=acoustic+levitation+diy https://www.youtube.com/results?search_query=acoustic+levita... There's some interesting applications combining it with projection here (Acoustic holography): https://www.youtube.com/watch?v=Q9GybXczNAc https://www.youtube.com/watch?v=Q9GybXczNAc

klysm 2y ago
The novelty fog fountains are typically a piezo micro mesh with tiny holes, which is similar but distinct from ultrasonic atomization
- jamal-kumar 2y ago
  I think you can get them on amazon etc as 'ultrasonic foggers', they're different somehow?
  - klysm 2y ago
    Yeah there are two ways I know of to achieve atomization using ultrasonic transducers. 1. Blast water with ultrasonic waves such that the top of the waves break off into droplets. This is well studied in the literature, but you need a decent amount of power to make it work. 2. Metal mesh piezo atomization. This uses the planar vibrational modes of a piezo disc to rapidly shove liquid through tiny holes.
    - jamal-kumar 2y ago
      Shit so they're basically just mis-representing what they're doing in there? I know about these things because I was looking into people who were experimenting with trying to grow food with roots dangling in nutritious fog for a while
      - klysm 2y ago
        Aeroponics is exactly what got me interested in the technology as well. I haven’t actually looked at the link so no idea about what they are potentially misrepresenting, but I did find it quite difficult to find good info on the metal mesh atomizers.

klysm 2y ago

The novelty fog fountains are typically a piezo micro mesh with tiny holes, which is similar but distinct from ultrasonic atomization

jamal-kumar 2y ago
I think you can get them on amazon etc as 'ultrasonic foggers', they're different somehow?
- klysm 2y ago
  Yeah there are two ways I know of to achieve atomization using ultrasonic transducers. 1. Blast water with ultrasonic waves such that the top of the waves break off into droplets. This is well studied in the literature, but you need a decent amount of power to make it work. 2. Metal mesh piezo atomization. This uses the planar vibrational modes of a piezo disc to rapidly shove liquid through tiny holes.
  - jamal-kumar 2y ago
    Shit so they're basically just mis-representing what they're doing in there? I know about these things because I was looking into people who were experimenting with trying to grow food with roots dangling in nutritious fog for a while
    - klysm 2y ago
      Aeroponics is exactly what got me interested in the technology as well. I haven’t actually looked at the link so no idea about what they are potentially misrepresenting, but I did find it quite difficult to find good info on the metal mesh atomizers.