History :
Before
going into much more detail there hasn't been much
history regarding Acoustic Levitation. It was not until
recently that experiments have begun to take place.
Leonardo Da Vinci was the first person to
discover that sound traveled in waves backing 1500
(AD). Over a hundred years later, Martin Mersenne
was the first to measure the speed of sound in air.
Over the next 200 years or so many other scientists
will contribute to the discovery of sound and
further their ideas on the topic. (thescienceclassroom.wikispaces.com)
The discovery of the
"standing wave" is credited Michael Faraday in
1831, when he noticed standing waves on the
surfaces of a liquid inside of a vibrating
container.
For
waves of equal amplitudes traveling in opposing
directions, there is on average no net
propagation of energy. (en.wikipedia.org)
Not until recently were objects and liquid
suspended against the gravitational force
of the earth by only using opposing sound
waves. Very recently scientists have used
a three-dimensional array of transducers
(sound horns) to not only suspend but move
small objects in a three-dimensional
environment.
Video :
Three-dimensional
Levitation
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