On 03 December 2003 15:02 Madhu Annapragada wrote:

> -----Original Message-----
> If you are looking for an "industrial automation application"
solution as
> opposed to a one-off hobby type application, look up Keyence sensors
> (www.keyence.com); they have a couple of laser based sensors and
> a few small
> range proximity sensors that do this sort of thing.
> Madhu


The problem with light based sensors is that the metal beam is
covered with a variable thickness of paint and grime.  The laser
/ light sensor would only pick up the surface of the beam and not
the metal below that.

Brian.

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