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An 11.3 meter long chamber is set up, filled with normal
atmosphere with a relative humidity very close to 100%. A
projector is placed a bit past one end of the chamber. This
projector must have a very high framerate; the z
resolution of the 3D image is the number of frames per
second of the
projector divided by thirty.
On the same end of the chamber, an extremely powerful
bass speaker is set up, playing a tone of precisely 30 hz.
At any time, there is exactly one peak in pressure from the
speaker in the chamber. At the moment this peak exits
the chamber, the speaker produces another one.
The conditions are set up so that water condenses from
the atmosphere briefly as every peak passes. This creates
a 340 m/s diffusing screen that sweeps the chamber 30
times per second, on to which the projector throws an
image. The illusion of a 3-d image is produced.
Note: This projector is likely to be somewhat loud*. It
might be better used for hard core metal concerts in the
middle of the desert than inner city movie theaters.
*absolutely ridiculously loud: Although I have not done
precise calculations, it is plausible that the 'speaker' would
be better described as a 30 Hz Bomb, as actual
shockwaves are the only type of sound I know for a fact
can cause instant condensation. Constructing the speaker
is it's own engineering problem. I suggest something
involving an explosively detonating gasoline vapor
mixture. However, this aspect is up to individual site
The effect that creates the screen [quadmaster, Nov 01 2011]
'Voxel' principle this is based on
[quadmaster, Nov 01 2011]
||Come on, you don't need to use an explosive device in your speaker. You just need to have a number of fighter jets flying past in close formation such that you get 30 of them fly past every second.
||Retiring to write Music Of The Spheres, based on the
sounds generated by colliding stellar bodies.
||At the risk of suggesting an implementable
alternative, how about a using a wind tunnel with
multiple pulsed bubble generators? A wall of
bubbles would then whoosh down the tunnel,
performing the same function as your wall of
condensate, but less noisily.
||The '30 Hz Bomb' speaker could probably be accomplished
with a repetetive high-amperage electric arc of enourmous
thinking along the lines of three or four feet) and some
artfully arranged baffles to enhance the resultant stacatto
of thunderclaps. A bare arc would mesh nicely with the
gasoline vapor feature, as well.