Piezoelectric sensors use the principle of a spring mass system. The sensitive core mass is subjected to a vibration acceleration to generate a force proportional to the acceleration, and the piezoelectric material is subjected to the force to form a charge signal proportional to the force along the surface thereof. Piezoelectric accelerometers are the most widely used vibration measuring sensors because of their large dynamic range, wide frequency range, ruggedness, low external interference, and the ability of piezoelectric materials to generate charge signals without any external power supply. Although the piezoelectric accelerometer has a simple structure and a long history of commercial use, its performance parameters are closely related to material characteristics, design and processing technology, so the actual parameters of the performance of similar sensors sold on the market and their stability. And the consistency is very different. Compared with piezoresistive and capacitive, the biggest drawback is that piezoelectric accelerometers cannot measure signals at zero frequency.
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