Piezoelectric sensors are characterized by having a transduction element made of a piezoelectric material. They are called active sensors because, in principle, no external energy is needed to obtain an output signal.
CITATION STYLE
Gautschi, G. (2002). Piezoelectric Sensors. In Piezoelectric Sensorics (pp. 73–91). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-04732-3_5
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