Piezoelectric sensor is a sensor based on piezoelectric effect. It is a self-generating and electromechanical conversion sensor. Its sensitive components are made of piezoelectric materials. The piezoelectric material generates electric charge on the surface after being forced. The charge is amplified by the charge amplifier and the measuring circuit and transformed into impedance. Then it becomes a power output proportional to the external force received. Piezoelectric sensors are used to measure force and non-electrical physical quantities that can be transformed into electricity. Its advantages are wide bandwidth, high sensitivity, high signal-to-noise ratio, simple structure, reliable work and light weight. The disadvantage is that some piezoelectric materials need moisture-proof measures, and the output DC response is poor. High input impedance circuits or charge amplifiers are needed to overcome this defect.
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