Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!nrl-cmf!mailrus!cornell!rochester!rit!ritcsh!sic
From: sic@ritcsh.UUCP (Eric A. Neulight)
Newsgroups: sci.electronics
Subject: Re: Vibration sensing
Keywords: Vibration Peak Sensor
Message-ID: <836@ritcsh.UUCP>
Date: 4 Jan 89 21:20:05 GMT
References: <10457@obiwan.mips.COM> <2884@kitty.UUCP>
Reply-To: sic@ritcsh.UUCP (Eric A. Neulight)
Organization: /etc/organization
Lines: 32

In article <2884@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>In article <10457@obiwan.mips.COM>, freeptos@mips.COM (Dan Freitas) writes:
>> Does anyone have any ideas for sensing vibration peaks?  I want to  detect
>> the maximum peak (in a given orientation) of a vibration of frequency ~1-2KHz.
> [stuff deleted]
>
>	Transducers fall into two common categories: (1) electrodynamic and
>(2) piezoelectric.
>

Just for completeness' sake...

Larry neglected to mention a third category, albeit more esoteric and
certainly overkill for your application.  ( probably why he did not think
it pertinent, but may as well add my little tid-bit.)

A few months back, I saw a demonstration of a commercially available
vibration measuring device which used laser interferometry for its
transducing.  You couldn't see or hear the vibration of the tuning fork
they were using, but this thing picked it up from several feet.  Come
to think of it, the government (and other underhanded types) use such
type devices to bug a conversation by picking up vibrations off windows
caused by noise on the other side.  I remember thinking at the time that
a laser interferometer would make a real nice (expensive) toy.

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