Piezoelectric sensors are mainly used to measure dynamic signals such as pressure, force, acceleration, vibration and sound. When the measured object is subjected to pressure or force, the piezoelectric material will generate charges, which will be converted into corresponding electrical signals through the measuring circuit for output. This kind of sensor has the characteristics of high sensitivity, fast response and wide frequency response range, and is widely used in dynamic signal measurement and control in industry, medical care, automobile, aerospace and other fields.