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This is an acoustic levitation chamber I designed and built in 1987 as a micro-gravity experiment for NASA related subject matter. The 12 inch cubed plexiglas Helmholtz Resonant Cavity has 3 speakers attached to the cube by aluminium acoustic waveguides. By applying a continuous resonant(600Hertz) sound wave, and by adjusting the amplitude and phase relationship amongst the 3 speakers; I was able to control levitation and movement in all 3 (x,y,z) axis of the ambient space. This research was used to show the effects of micro-gravity conditions that exist in the space shuttle environment in orbit, but done here on Earth in a lab. This is not "anti-gravity." So don't waste time arguing something pointless.
As a result of multiple reflections between an ultrasonic radiator and a solid, flat or concave reflector - which is adjusted concentrically at a distance of some multiple half wavelengths - a standing wave with equally spaced nodes and antinodes of the sound pressure and velocity amplitude will be generated (see Figure 2-1). Solid or liquid samples with effective diameters of less than half a wavelength will be levitated without contact below the pressure nodes as a result of axial radiation pressure and radial Bernoulli stress. Minimal acoustic power is required for this levitation, when the sound wavelength is about three times the sample diameter (see Table 2-1).
Originally posted by Phage
reply to post by andre18
Except for the minor detail of the Helmholtz Resonant Cavity being necessary to create the standing waves which enable the levitation.
Sweet. Lends more credence to my theory that the Egyptians were masters of frequency, although I doubt they were using acoustic levitation as much as "resonant levitation", based off frequencies inside the stone, rather than external sound frequencies.
acoustic levitation chamber