1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Acoustic levitation shape question (Japanese scientists link)

  1. Feb 24, 2014 #1

    I wanted to ask is there a specific reason for the completely horizontal X shape of the levitated particles. If we already have such precise control over the standing waves, couldn't it be possible to make more unique shapes?

    Like a 3d one with depth (a bigger thickness, or more levels), or a square pattern with 4 walls and an empty center? Or does it have to be a variation of a 2d star because of the orientation of the speakers? Would 2 more speakers give the X 2 more lines? What about a speaker ring or a sphere?
    Ultimately that would allow us to control more objects at once independently, and use it in automated construction better.
    Last edited by a moderator: Sep 25, 2014
  2. jcsd
  3. Feb 25, 2014 #2


    User Avatar
    Gold Member

    The patterns visible in the video are caused by the pressure nodes in the acoustic field. It appears there are four speakers that contribute to the total sound field. Then when their driving signals' phases are changed it causes the 4-sided group to rotate. Yes, if you mounted more speakers around the circumference the sound field would be generated with more complex (and potentially more controllable) nodes. I've never heard of a "speaker ring", but many speakers evenly spaced around the center would begin to approximate that. My guess is that yes, that would allow more complex motions of suspended particles. Those little white beads are Styrofoam, the LED, and tiny resistor are all very light weight. Suspending heavier objects would require HUGE amounts of acoustical power. Why not experiment yourself and then come back here to Physics Forums and show us your results?
  4. Feb 25, 2014 #3


    User Avatar
    Gold Member

    Here is a paper describing the experiment:

    "Three-dimensional Mid-air Acoustic Manipulation by Ultrasonic Phased Arrays"
    Authors: Yoichi Ochiai, Takayuki Hoshi, Jun Rekimoto
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Acoustic levitation shape question (Japanese scientists link)
  1. Acoustic levitation (Replies: 6)