Re: Pier design and sand

masterson_harold <hfm5022@...>

You are trying to measure the motion of the pier. Use an
accelerometer, not a microphone.

--- In ap-gto@..., "N. Foldager" <nf@...> wrote:

If the Petrie dish has value, then it is far simpler to attach
a mic to
the side of a pier, and plug the mic output into your laptop audio

I question the "Petri method" as I don't think it for sure can
discriminate between the bell like oscillations (which we don't care
about) and the bending oscillations. (Or can it? The frequency of
latter should be much lower.) I believe that a microphone attached to
the pier will only record the "sound of the bell", not the bending of
the pier.

Best regards,

Niels Foldager

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