>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 ?

Bimorph sensor maybe.
I can't fully understand from the description what you are attempting to 
achieve.


   R 

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