At 08:10 AM 12/3/2003 -0500, you wrote:
>Vasile Surducan wrote:
> > The problem which requires to be solved its a small distance
> > measurement at high speed (about 15cm/second) in a high EM radiation
> > environement (near a few KW generated from 300KHz inductors). The
> > medium distance to be measured is about 2mm, between a a metal
> > surface which have inflexions (it's not a plane surface) and a moving
> > tool. The metal surface is painted, dirty and gruffly, where the
> > paint+dirt have a variable thickness.
> > The generators can't be shutted off while the measurement is
> > performed.
> > I will be glad to hear any possible ideea from specialists (or just
> > thinkers) from these lists.
>
>How about shining a thin light beam at an angle and using parallax from
>another sensor to measure distance?


This should work especially if you use a laser.

If you're looking for defects or flaws, you might also want to digitize the
sensor information and run it thought a trained neural network.


>Are mechanical means out of the question, like an idler wheel on a spring
>loaded lever, then measure the deflection of the lever?


I'd be surprised if a mechanical solution would be sensitive or fast
enough.

DOC



http://www.robot-one.ca

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