Video Camera, Proximity sensor?

Or, as the tape deflects, it will be stretched. So if you have a small
amount of deflection or an elastic conductor, you could possible get
an estimate of deflection from the resistance increase.

Or just a strain gauge connected to one end?

RP

On 25/11/2008, Michael Algernon <pic@nope9.com> wrote:
> I want to measure the absolute deflection of a piece of tape 20 inches
>  long.
>  One possibility is to use piezoelectric film.  Is piezo film good only
>  for measuring change
>  of deflection rather than absolute deflection ?
>  Is there any sensing technology that would measure absolute deflection
>  given that I am constrained to a "tape-like" sensor that is 20 inches
>  long ?
>
>  MA
>
>
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