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moving wall laser demo



Can anyone give me a reference to a demonstration I saw a few years back?

It was something along the lines of gluing a tiny mirror to a wall,
shining a laser off the mirror, collecting the laser light with a
sensor of some kind and turning the beam into sound (or some kind of
display). If I recall correctly the idea was to somehow have the
sensor set-up sensitive enough that you could 'hear' the wall move if
you pushed on it with your hand. I don't recall exactly how the beam
detector or setup was sensitive enough to the wall's location to be
able to detect its very slight motion.

Any hints or a reference would be appreciated. Thanks in advance.

kyle
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kyle forinash 812-941-2390
kforinas@ius.edu
Natural Science Division
Indiana University Southeast
New Albany, IN 47150
http://Physics.ius.edu/
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