> How would you do this? I can imagine using the sheet as the 
> dielectric
> between 2 plates. Would a tiny change in thickness create enough 
> variance of
> capacitance to measure accurately?

If you can maintain a sensor at a small distance above the paper as it 
eg travels over a roller then the change in capacitance should be 
highly proportional to paper thickness. Dielectric constant of paper 
relative to air (1) governs how large a swing you'll get.



        Russell


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