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

>-----Original Message-----
>From: pic microcontroller discussion list
>
>>Hi there,
>>
>>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.
>>
>>thank you in advance,
>>
>>Vasile

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