> From: "Venstra, W.J." 
> To: "'mems-talk@memsnet.org'" 
> Subject: RE: [mems-talk] Mechanical property measurement of cantilever
> Date: Thu, 24 Oct 2002 17:54:58 +0200
> Reply-To: mems-talk@memsnet.org
>
> ... You might also consider a CD or DVD pickup for measuring
> displacement and resonance frequency.
> ... The focus error signal obtained from the pickup
> represents the cantilever displacement.


Hi Warner

I'm looking around for accurate high-frequency diplacement measurement
techniques and that approach sounds very interesting. But since I'm not familiar
with it, I was wondering what range of displacements can be measured this way?
And can you recommend any sources of further information?

I've got a CD I can use as a source of parts, so any suggestions as to where to
find some examples that I could use as a guide in setting up the pickup and its
circuitry would be most appreciated.

Thanks

-- Emilio

--------------------------------------------------------------
Emilio P. Calius
Industrial Research Limited
www.irl.cri.nz/engineering-dynamics