Has anyone ever heard of a fiber optic sensor
like using some kind if laser through a fiber
which can be stretched this way and that to
produce an interference pattern or something ?

I hear if you wind a dense coil of fiber optics
and run light through it you can create such a
thing just from motion alone making an
optical gyroscope. This guy was demonstrating it in
Phoenix at a Techno Show years ago but like
no one seemed to care. ( No moving parts,
just a coil with light running through it)

??

Possibly monofiliment fishing line as a spring or ??

With a mass resting on it ??

How to generate an interference pattern ?

Just searching for ideas.

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