Lec 29 II Capacitive and Piezoelectric Pressure Transducers

A variable capacitance pressure transducer has a capacitive plate (diaphragm), and another capacitive plate (electrode) fixed to an unpressurized surface, with a gap of a certain distance between the diaphragm and the electrode. A change in pressure will widen or narrow the gap between the two plates, which varies the capacitance. This change in capacitance is then converted into a usable signal.
Piezoelectricity is the charge created across certain materials when mechanical stress is applied. Piezoelectric pressure sensors exploit this effect by measuring the voltage across a piezoelectric element generated by the applied pressure. They are very robust and are used in a wide range of industrial applications.

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