Peter Neubert wrote:
>
> Get hold of an elastic fiber optic cable (if it has been invented) meassure
> the time it
> takes to send a pulse and Voila you got the distance :-)

Well I suppose if you wrapped it round a couple of million times
and used an SX from Scenix

I was thinking of sugesting timing ultrsonic pulse along the tube.
As you only require the change not absolute distance you probably
would not need to bother with compensating for temp and pressure
but the guy was looking for a simple solution

peter@cousens.her.forthnet.gr