Hello,
I believe that poling a PVDF sheet gives it piezoelectric properties, which makes it useful for pressure transducer applications (acoustics, etc). However, my understanding of piezoelectric materials is that they generate a voltage as they are in the process of being stressed or unstressed. I have always thought of this behaviour as being dynamic (i.e. a varying pressure will cause a varying voltage to be generated). I would like to confirm if a poled PVDF sheet is also useful for measuring *static* pressure. For example, could it be used as a sensor for an electronic weighing scales, where the pressure would be constant during the measuring process? My current understanding of energy conservation laws leads me to guess that a voltage would only be generated as the weight is being applied or removed, and not under static pressure (else we could build an 'infinite' power source by sitting a weight on top of a PVDF sheet). I would be grateful for any help in clarifying this point.
Thanks in advance, John.